Pub Date : 2024-03-23DOI: 10.1134/S1560090424600062
O. A. Adzhieva, A. V. Roenko, Yu. I. Denisova, G. A. Shandryuk, Y. V. Kudryavtsev
This work addresses the development of methods for the synthesis of novel functional polymers from cyclooctene. Novel monomers containing toluenesulfonyl (tosyl) or methylsulfonyl (mesyl) groups in position 5, which are easily involved in the reaction of bimolecular nucleophilic substitution, are obtained. Novel homopolymers poly(5-toluenesulfonylcyclooctene) and poly(5-methylsulfonylcyclooctene) are synthesized by ring-opening metathesis polymerization mediated by Grubbs’s catalysts and characterized by NMR, GPC, and DSC methods. Multiblock copolymers with isolated functional groups are synthesized by interchain exchange cross-metathesis between polycyclooctene and poly(5-toluenesulfonylcyclooctene), and statistical copolymers are synthesized by the metathesis copolymerization of cyclooctene and 5-toluenesulfonyl- or 5-methylsulfonylcyclooctene. A procedure for grafting ethylene glycol and its monosubstituted derivatives onto poly(5-methylsulfonylcyclooctene) and poly(5-methylsulfonylcyclooctene) is developed and tested. This modification procedure renders it possible to reach a low degree of grafting due to the competing elimination of tosyl and mesyl functional groups leading to the formation of additional double carbon bonds in the polymer backbone.
{"title":"Synthesis of Novel 5-Toluenesulfonyl- and 5-Methylsulfonylcyclooctene Polymers and Their Cоpolymers with Cyclooctene","authors":"O. A. Adzhieva, A. V. Roenko, Yu. I. Denisova, G. A. Shandryuk, Y. V. Kudryavtsev","doi":"10.1134/S1560090424600062","DOIUrl":"10.1134/S1560090424600062","url":null,"abstract":"<p>This work addresses the development of methods for the synthesis of novel functional polymers from cyclooctene. Novel monomers containing toluenesulfonyl (tosyl) or methylsulfonyl (mesyl) groups in position 5, which are easily involved in the reaction of bimolecular nucleophilic substitution, are obtained. Novel homopolymers poly(5-toluenesulfonylcyclooctene) and poly(5-methylsulfonylcyclooctene) are synthesized by ring-opening metathesis polymerization mediated by Grubbs’s catalysts and characterized by NMR, GPC, and DSC methods. Multiblock copolymers with isolated functional groups are synthesized by interchain exchange cross-metathesis between polycyclooctene and poly(5-toluenesulfonylcyclooctene), and statistical copolymers are synthesized by the metathesis copolymerization of cyclooctene and 5-toluenesulfonyl- or 5-methylsulfonylcyclooctene. A procedure for grafting ethylene glycol and its monosubstituted derivatives onto poly(5-methylsulfonylcyclooctene) and poly(5-methylsulfonylcyclooctene) is developed and tested. This modification procedure renders it possible to reach a low degree of grafting due to the competing elimination of tosyl and mesyl functional groups leading to the formation of additional double carbon bonds in the polymer backbone.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"773 - 785"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140205734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090423600237
Hussain A. Badran, Nadia A. Hussein Al-Assady, Harith A. Hasan, Riyadh Ch. Abul-Hail, Raeed K. Al-Fahed
In this study, the compound polyaniline (PANI) with three different concentrations of (H2SO4) sulfuric acid has been synthesized by the chemical polymerization method and characterized by FTIR spectrophotometer to detect effective group, field emission scanning electron microscopy (FE-SEM) and UV‒Vis absorption spectroscopic. They performed a differential calorimetric scan to describe the behavior of the compound as it measures the thermal energy that circulates from or to the polymer reported. The endo-thermic transition, due to structural adjustment, is a characteristic of the PANI. Casting has been a suitable method for preparing PANI films on FTO glass. The third order non-linear optical (NLO) properties of thin films were investigated using the Z-scan technique. The experimental data recorded resulted in the calculation of the nonlinear optical absorption coefficient, the nonlinear refractive index. PANI at various concentrations of sulfuric acid has a significant optical nonlinearity. Such material could expect new photon applications. The polymer samples with different concentrations exhibits high nonlinear reflective index under continuous wave laser at the experimental wavelength. Reverse saturable absorption is the dominating mechanism for the observed absorption nonlinearities. Therefore, compound polyaniline emerges as a potential candidate for photonic device applications. The synthesized thin film structures of PANI with three different concentrations of (H2SO4) sulfuric acid shows the response to NH3 gas sensing in the range 20–250 ppm and can be used for NH3 sensing application.
摘要 在这项研究中,采用化学聚合法合成了含有三种不同浓度(H2SO4)硫酸的聚苯胺(PANI)化合物,并通过傅立叶变换红外分光光度计检测有效基团、场发射扫描电子显微镜(FE-SEM)和紫外可见吸收光谱进行了表征。他们进行了微分量热扫描,以描述该化合物的行为,因为它测量了从聚合物中或向聚合物报告的热能循环。结构调整导致的内热转变是 PANI 的一个特征。浇铸是在 FTO 玻璃上制备 PANI 薄膜的合适方法。使用 Z 扫描技术研究了薄膜的三阶非线性光学 (NLO) 特性。根据记录的实验数据计算出了非线性光学吸收系数和非线性折射率。在不同浓度的硫酸中,PANI 具有显著的光学非线性。这种材料有望得到新的光子应用。不同浓度的聚合物样品在实验波长的连续波激光下表现出很高的非线性反射率。反向可饱和吸收是观察到的吸收非线性的主要机制。因此,复合聚苯胺成为光子器件应用的潜在候选材料。用三种不同浓度的(H2SO4)硫酸合成的 PANI 薄膜结构显示出在 20-250 ppm 范围内的 NH3 气体传感响应,可用于 NH3 传感应用。
{"title":"Synthesis, DSC Properties, Surface Morphology and the Third-Order Behavior Studies of a Conducting Polymer","authors":"Hussain A. Badran, Nadia A. Hussein Al-Assady, Harith A. Hasan, Riyadh Ch. Abul-Hail, Raeed K. Al-Fahed","doi":"10.1134/S1560090423600237","DOIUrl":"10.1134/S1560090423600237","url":null,"abstract":"<p>In this study, the compound polyaniline (PANI) with three different concentrations of (H<sub>2</sub>SO<sub>4</sub>) sulfuric acid has been synthesized by the chemical polymerization method and characterized by FTIR spectrophotometer to detect effective group, field emission scanning electron microscopy (FE-SEM) and UV‒Vis absorption spectroscopic. They performed a differential calorimetric scan to describe the behavior of the compound as it measures the thermal energy that circulates from or to the polymer reported. The endo-thermic transition, due to structural adjustment, is a characteristic of the PANI. Casting has been a suitable method for preparing PANI films on FTO glass. The third order non-linear optical (NLO) properties of thin films were investigated using the Z-scan technique. The experimental data recorded resulted in the calculation of the nonlinear optical absorption coefficient, the nonlinear refractive index. PANI at various concentrations of sulfuric acid has a significant optical nonlinearity. Such material could expect new photon applications. The polymer samples with different concentrations exhibits high nonlinear reflective index under continuous wave laser at the experimental wavelength. Reverse saturable absorption is the dominating mechanism for the observed absorption nonlinearities. Therefore, compound polyaniline emerges as a potential candidate for photonic device applications. The synthesized thin film structures of PANI with three different concentrations of (H<sub>2</sub>SO<sub>4</sub>) sulfuric acid shows the response to NH<sub>3</sub> gas sensing in the range 20–250 ppm and can be used for NH<sub>3</sub> sensing application.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"858 - 872"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090424600049
Mingwei Du, Shuang Men, Yujuan Jin
Hydrophobic modification of hydroxyethyl cellulose is carried out in ionic liquids homogeneously, with bromododecane as the etherification agent. FTIR, XRD, XPS, and DSC analysis are used to characterize the obtained products. The effect of reaction temperature, time and the content of bromododecane on the viscosity of the aqueous solution of the modified product are discussed in detail. It is found that when hydroxyethyl cellulose is modified with the optimal conditions (at 80°C for 6 h), the crystalline structure changes to amorphous completely, the degree of substituent is 0.27, the glass transition point increases from 102.1 to 128.6°C. The thickening property, viscosity temperature resistance and salt tolerance before and after grafting long alkyl chain into the molecular chains are compared. It concludes that by hydrophobically modifying hydroxyethyl cellulose with long alkyl chains, all the above properties can be significantly improved, which may extremely expand the applications of hydroxyethyl cellulose.
{"title":"Homogeneous Hydrophobic Modification of Hydroxyethyl Cellulose in Ionic Liquids","authors":"Mingwei Du, Shuang Men, Yujuan Jin","doi":"10.1134/S1560090424600049","DOIUrl":"10.1134/S1560090424600049","url":null,"abstract":"<p>Hydrophobic modification of hydroxyethyl cellulose is carried out in ionic liquids homogeneously, with bromododecane as the etherification agent. FTIR, XRD, XPS, and DSC analysis are used to characterize the obtained products. The effect of reaction temperature, time and the content of bromododecane on the viscosity of the aqueous solution of the modified product are discussed in detail. It is found that when hydroxyethyl cellulose is modified with the optimal conditions (at 80°C for 6 h), the crystalline structure changes to amorphous completely, the degree of substituent is 0.27, the glass transition point increases from 102.1 to 128.6°C. The thickening property, viscosity temperature resistance and salt tolerance before and after grafting long alkyl chain into the molecular chains are compared. It concludes that by hydrophobically modifying hydroxyethyl cellulose with long alkyl chains, all the above properties can be significantly improved, which may extremely expand the applications of hydroxyethyl cellulose.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"786 - 791"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090424600086
Shu-Hui Khor, Michelle Li-Yen Lee, Sook-Wai Phang, Wan Jefrey Basirun, Joon-Ching Juan
Materials with different morphologies may possess different electrical conductivities which contribute to different photodegradation efficiencies. Hence, it is crucial to control the morphology of the photocatalysts. Therefore, the effect of PANI morphology on the electrical conductivity is investigated in this research. PANI with different morphologies have been fabricated via template-free method in the presence of various dopants and utilized as photocatalyst. The different morphologies of PANI are expected to yield different photocatalytic ability towards pollutants such as dyes in wastewater due to their differences in surface area and charge carriers (conductivity). The chemical structures and oxidation states of the prepared photocatalysts were confirmed by FTIR and UV–Vis spectra. The electrical conductivity of photocatalysts were measured using four probe point method on PANI pellet while the morphological studies were investigated using FESEM. From the results, nanotube-PANI exhibited the highest electrical conductivity (1.22 × 10–2 S/cm), followed by nanosphere-PANI (1.16 × 10–2 S/cm), nanofiber-PANI (4.59 × 10–3), star-PANI (5.84 × 10–4 S/cm) and leaf-PANI (5.57 × 10–3 S/cm). PANI with nanotube structure is more conductive as the nanostructure has a longer conjugated polymer chain than the other micro/nanostructures and hence it can facilitate electron transport and subsequently enhances electrical conductivity of PANI.
摘要 不同形态的材料可能具有不同的导电性,从而导致不同的光降解效率。因此,控制光催化剂的形态至关重要。因此,本研究调查了 PANI 形态对导电性的影响。在各种掺杂剂的作用下,通过无模板方法制备出了不同形态的 PANI,并将其用作光催化剂。由于 PANI 的表面积和电荷载体(电导率)不同,预计不同形态的 PANI 会对废水中的染料等污染物产生不同的光催化能力。傅立叶变换红外光谱和紫外可见光谱证实了所制备光催化剂的化学结构和氧化态。使用四探针点法测量了 PANI 粒子上光催化剂的电导率,同时使用 FESEM 对其形态进行了研究。结果表明,纳米管-PANI 的导电率最高(1.22 × 10-2 S/cm),其次是纳米球-PANI(1.16 × 10-2 S/cm)、纳米纤维-PANI(4.59 × 10-3)、星形-PANI(5.84 × 10-4 S/cm)和叶片-PANI(5.57 × 10-3 S/cm)。与其他微/纳米结构相比,具有纳米管结构的 PANI 具有更长的共轭聚合物链,因此它能促进电子传输,从而增强 PANI 的导电性。
{"title":"Effect of Morphology on the Electrical Conductivity of Polyaniline as Potential Photocatalyst","authors":"Shu-Hui Khor, Michelle Li-Yen Lee, Sook-Wai Phang, Wan Jefrey Basirun, Joon-Ching Juan","doi":"10.1134/S1560090424600086","DOIUrl":"10.1134/S1560090424600086","url":null,"abstract":"<p>Materials with different morphologies may possess different electrical conductivities which contribute to different photodegradation efficiencies. Hence, it is crucial to control the morphology of the photocatalysts. Therefore, the effect of PANI morphology on the electrical conductivity is investigated in this research. PANI with different morphologies have been fabricated via template-free method in the presence of various dopants and utilized as photocatalyst. The different morphologies of PANI are expected to yield different photocatalytic ability towards pollutants such as dyes in wastewater due to their differences in surface area and charge carriers (conductivity). The chemical structures and oxidation states of the prepared photocatalysts were confirmed by FTIR and UV–Vis spectra. The electrical conductivity of photocatalysts were measured using four probe point method on PANI pellet while the morphological studies were investigated using FESEM. From the results, nanotube-PANI exhibited the highest electrical conductivity (1.22 × 10<sup>–2</sup> S/cm), followed by nanosphere-PANI (1.16 × 10<sup>–2</sup> S/cm), nanofiber-PANI (4.59 × 10<sup>–3</sup>), star-PANI (5.84 × 10<sup>–4</sup> S/cm) and leaf-PANI (5.57 × 10<sup>–3</sup> S/cm). PANI with nanotube structure is more conductive as the nanostructure has a longer conjugated polymer chain than the other micro/nanostructures and hence it can facilitate electron transport and subsequently enhances electrical conductivity of PANI.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"873 - 880"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090424600104
Rakhi Tyagi, Pradeep Sharma, Raman Nautiyal
Effect of four reaction factors including reaction time, concentration of NaOH, propylene oxide, and composition (methanol : water, v/v) of reaction medium was determined on hydroxypropyl content (%) and viscosity of hydroxypropyl guar gum using orthogonal design of experiment. Among all synthesized hydroxypropyl guar gum derivatives highest viscosity, and hydroxypropyl content was determined 5708.0 cPs and 0.487% respectively. Taguchi L9 (34) design of experiment suggested 3 h and 0.1 mol as optimized reaction duration and concentration of etherifying reagent for higher hydroxypropyl content as well as viscosity. Optimized amount of NaOH was determined 0.03 and 0.02 mol for hydroxypropyl content and viscosity respectively. While the optimized composition of reaction medium (methanol : water, v/v) was determined 7 : 1 and 9 : 1 for hydroxypropyl content and viscosity respectively. Reaction time, and concentration of propylene oxide were determined as most impacting factor for hydroxypropyl content and viscosity of hydroxypropyl content respectively. Optimized products determined to exhibit 0.83% and 5902 cPs of hydroxypropyl content and viscosity respectively.
{"title":"A Comparative Study on Optimization of Reaction Conditions towards Synthesis of Hydroxypropyl Guar Gum with Higher Viscosity and Hydroxypropyl Content: A Statistical Approach","authors":"Rakhi Tyagi, Pradeep Sharma, Raman Nautiyal","doi":"10.1134/S1560090424600104","DOIUrl":"10.1134/S1560090424600104","url":null,"abstract":"<p>Effect of four reaction factors including reaction time, concentration of NaOH, propylene oxide, and composition (methanol : water, v/v) of reaction medium was determined on hydroxypropyl content (%) and viscosity of hydroxypropyl guar gum using orthogonal design of experiment. Among all synthesized hydroxypropyl guar gum derivatives highest viscosity, and hydroxypropyl content was determined 5708.0 cPs and 0.487% respectively. Taguchi L9 (3<sup>4</sup>) design of experiment suggested 3 h and 0.1 mol as optimized reaction duration and concentration of etherifying reagent for higher hydroxypropyl content as well as viscosity. Optimized amount of NaOH was determined 0.03 and 0.02 mol for hydroxypropyl content and viscosity respectively. While the optimized composition of reaction medium (methanol : water, v/v) was determined 7 : 1 and 9 : 1 for hydroxypropyl content and viscosity respectively. Reaction time, and concentration of propylene oxide were determined as most impacting factor for hydroxypropyl content and viscosity of hydroxypropyl content respectively. Optimized products determined to exhibit 0.83% and 5902 cPs of hydroxypropyl content and viscosity respectively.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"893 - 901"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090423600213
S. S. Gusarov, O. I. Kudinova, I. A. Maklakova, N. G. Ryvkina, A. A. Gulin, T. A. Ladygina, L. A. Novokshonova
Composites with a two-layer coating consisting of ultra-high molecular weight polyethylene and a lower molecular weight high-density polyethylene are synthesized by the sequential two-step polymerization of ethylene on the surface of catalyst-activated Al2O3 particles to modify the properties of composite materials with the ultra-high molecular weight polyethylene matrix. The pressed specimens of the composites with the two-layer coating are characterized by the uniform distribution of components. The effect of composition of polymer coating of Al2O3 particles on the thermophysical and rheological properties of composite reactor powders and the deformation–strength properties of pressed specimens is studied. In nascent composite particles with the two-layer coating, the morphology of outer polymer layers is different and depends on the polymer type. The creation of two-layer coatings with the outer layer of a lower molecular weight polyethylene on filler particles renders it possible to realize the melt flowability of the composites at certain component ratios, while preserving deformation–strength characteristics at a high level. The proposed polymerization technique shows promise for development of ultra-high molecular weight polyethylene composite powders with the desired morphology and rheological characteristics suitable for selective laser sintering 3D printing. All synthesized composite powders based on Al2O3 spherical particles with one- and two-layer polymer coatings have shape close to spherical, repeating the shape of filler particles. In terms of rheological characteristics, they meet the requirements of selective laser sintering 3D printing and have free flowability, and the material of parts printed by this technology does not suffer from warping and shrinkage.
{"title":"Modification of Properties of Composites Based on Ultra-High Molecular Weight Polyethylene by Creating Two-Layer Coatings with Low Molecular Weight Polyethylene on Filler Particles: Synthesis, Properties, and Application in 3D Printing by Selective Laser Sintering","authors":"S. S. Gusarov, O. I. Kudinova, I. A. Maklakova, N. G. Ryvkina, A. A. Gulin, T. A. Ladygina, L. A. Novokshonova","doi":"10.1134/S1560090423600213","DOIUrl":"10.1134/S1560090423600213","url":null,"abstract":"<p>Composites with a two-layer coating consisting of ultra-high molecular weight polyethylene and a lower molecular weight high-density polyethylene are synthesized by the sequential two-step polymerization of ethylene on the surface of catalyst-activated Al<sub>2</sub>O<sub>3</sub> particles to modify the properties of composite materials with the ultra-high molecular weight polyethylene matrix. The pressed specimens of the composites with the two-layer coating are characterized by the uniform distribution of components. The effect of composition of polymer coating of Al<sub>2</sub>O<sub>3</sub> particles on the thermophysical and rheological properties of composite reactor powders and the deformation–strength properties of pressed specimens is studied. In nascent composite particles with the two-layer coating, the morphology of outer polymer layers is different and depends on the polymer type. The creation of two-layer coatings with the outer layer of a lower molecular weight polyethylene on filler particles renders it possible to realize the melt flowability of the composites at certain component ratios, while preserving deformation–strength characteristics at a high level. The proposed polymerization technique shows promise for development of ultra-high molecular weight polyethylene composite powders with the desired morphology and rheological characteristics suitable for selective laser sintering 3D printing. All synthesized composite powders based on Al<sub>2</sub>O<sub>3</sub> spherical particles with one- and two-layer polymer coatings have shape close to spherical, repeating the shape of filler particles. In terms of rheological characteristics, they meet the requirements of selective laser sintering 3D printing and have free flowability, and the material of parts printed by this technology does not suffer from warping and shrinkage.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"946 - 954"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090424600050
E. A. Olenich, V. V. Gorodov, S. A. Milenin, G. V. Cherkaev, D. A. Khanin, M. I. Buzin, A. M. Muzafarov
A series of poly[dimethyl(methylbenzyl)siloxanes] with different content of the methylbenzylsiloxane fragments have been synthesized. Structure of the polymers has been confirmed by means of 1Н and 29Si NMR spectroscopy. Thermal properties of the polymers have been investigated by means of differential scanning calorimetry and thermogravimetric analysis. It has been found that the copolymer crystallization is suppressed at the content of the methylbenzylsiloxane fragments on the copolymer of 3 mol % and higher, while the glass transition temperature is only insignificantly shifted towards the positive range. The copolymers have exhibited high temperature resistance and can be used over a wide temperature range.
{"title":"Thermofrost-Resistant Poly[dimethyl(methylbenzyl)siloxanes]: Synthesis and Properties","authors":"E. A. Olenich, V. V. Gorodov, S. A. Milenin, G. V. Cherkaev, D. A. Khanin, M. I. Buzin, A. M. Muzafarov","doi":"10.1134/S1560090424600050","DOIUrl":"10.1134/S1560090424600050","url":null,"abstract":"<p>A series of poly[dimethyl(methylbenzyl)siloxanes] with different content of the methylbenzylsiloxane fragments have been synthesized. Structure of the polymers has been confirmed by means of <sup>1</sup>Н and <sup>29</sup>Si NMR spectroscopy. Thermal properties of the polymers have been investigated by means of differential scanning calorimetry and thermogravimetric analysis. It has been found that the copolymer crystallization is suppressed at the content of the methylbenzylsiloxane fragments on the copolymer of 3 mol % and higher, while the glass transition temperature is only insignificantly shifted towards the positive range. The copolymers have exhibited high temperature resistance and can be used over a wide temperature range.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"812 - 820"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090424600153
Milad Sheydaei, Milad Edraki, Shiva Javanbakht
Herein, firstly, sodium montmorillonite (Na+-MMT) was modified with Ganoderma lucidum (GL), and then the anti-corrosion properties of new nanoparticles (GL-MMT) were evaluated. For this purpose, GL-MMT was added to epoxy (EP), and their nanocomposite was prepared. GL-MMT was evaluated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). Polarization and salt spray tests showed that GL‑MMT improved corrosion resistance. The hydrophobic nature of GL-MMT caused the hydrophobic properties to be observed in nanocomposites so that the EP/3% GL-MMT showed a contact angle of 73°. Also, the results of thermogravimetric (TGA) analysis, adhesion strength, and tensile test showed that GL‑MMT improves the properties of the coating. This enhanced in properties is due to the uniform distribution of GL-MMT in the matrix and also the polymer chains are easily able to penetrate into the MMT galleries. Moreover, the antimicrobial results showed that the coatings containing GL-MMT are inhibitory and killing against Staphylococcus epidermidis and Streptococcus pyogenes.
{"title":"Ganoderma Lucidum-Modified Clay Epoxy Coating: Investigation of Thermal, Mechanical, Anticorrosion, and Antimicrobial Properties","authors":"Milad Sheydaei, Milad Edraki, Shiva Javanbakht","doi":"10.1134/S1560090424600153","DOIUrl":"10.1134/S1560090424600153","url":null,"abstract":"<p>Herein, firstly, sodium montmorillonite (Na<sup>+</sup>-MMT) was modified with <i>Ganoderma lucidum</i> (GL), and then the anti-corrosion properties of new nanoparticles (GL-MMT) were evaluated. For this purpose, GL-MMT was added to epoxy (EP), and their nanocomposite was prepared. GL-MMT was evaluated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). Polarization and salt spray tests showed that GL‑MMT improved corrosion resistance. The hydrophobic nature of GL-MMT caused the hydrophobic properties to be observed in nanocomposites so that the EP/3% GL-MMT showed a contact angle of 73°. Also, the results of thermogravimetric (TGA) analysis, adhesion strength, and tensile test showed that GL‑MMT improves the properties of the coating. This enhanced in properties is due to the uniform distribution of GL-MMT in the matrix and also the polymer chains are easily able to penetrate into the MMT galleries. Moreover, the antimicrobial results showed that the coatings containing GL-MMT are inhibitory and killing against <i>Staphylococcus epidermidis</i> and <i>Streptococcus pyogenes</i>.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"991 - 1000"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1134/S1560090424600128
Sumaiya Akhlaq, Dhananjay Singh, Nishu Mittal, Mohammed Haris Siddiqui
The non-biodegradable plastic waste accounts for the major portion of landfill solid waste leading a threat to both fossil fuels and the environment. As biodegradable nature bioplastics are a good replacement for conventional plastics. The global market for biopolymers and bioplastics is expanding rapidly as they make a significant contribution in reduction of environmental pollution. Bioplastics are completely decomposed into natural compounds by fungi, algae, and bacteria in a very short time under aerobic and anaerobic conditions. Bioplastics are categorized into three types namely, biodegradable, and biobased bioplastics (e.g., PLA, PHA, PGLA), nonbiodegradable and biobased bioplastics (e.g. Bio PE, Bio PET), and biodegradable and petroleum-based bioplastics (e.g. PCL, PBS, PBSA). Fungal degradation of bioplastics depends upon several physical, microbiological, and characteristic features of the polymer. The fungal strain-mediated biodegradation of bioplastics leads to the release of natural inorganic and inorganic compounds that do not negatively impact microbial diversity, nutrient cycle, and nitrogen content in the soil. This review highlights the impact of bioplastics on environmental sustainability and role of fungal biodegradation of bioplastics. The information provided in this review will help in development of more efficient strains of fungal as well as in research and development of bioplastic.
摘要 不可降解塑料废物占垃圾填埋场固体废物的大部分,对化石燃料和环境都构成威胁。生物塑料具有可生物降解的特性,是传统塑料的良好替代品。生物聚合物和生物塑料的全球市场正在迅速扩大,因为它们在减少环境污染方面做出了重大贡献。在有氧和无氧条件下,生物塑料可在很短的时间内被真菌、藻类和细菌完全分解成天然化合物。生物塑料分为三类,即可生物降解和生物基生物塑料(如 PLA、PHA、PGLA)、不可生物降解和生物基生物塑料(如 Bio PE、Bio PET)以及可生物降解和石油基生物塑料(如 PCL、PBS、PBSA)。生物塑料的真菌降解取决于聚合物的一些物理、微生物和特性特征。真菌菌株介导的生物塑料降解会导致天然无机和无机化合物的释放,不会对土壤中的微生物多样性、营养循环和氮含量产生负面影响。本综述强调了生物塑料对环境可持续性的影响以及真菌生物降解生物塑料的作用。本综述提供的信息将有助于开发更高效的真菌菌株以及生物塑料的研究和开发。
{"title":"A Review on Biodegradation of Bioplastics in Different Environmental Conditions","authors":"Sumaiya Akhlaq, Dhananjay Singh, Nishu Mittal, Mohammed Haris Siddiqui","doi":"10.1134/S1560090424600128","DOIUrl":"10.1134/S1560090424600128","url":null,"abstract":"<p>The non-biodegradable plastic waste accounts for the major portion of landfill solid waste leading a threat to both fossil fuels and the environment. As biodegradable nature bioplastics are a good replacement for conventional plastics. The global market for biopolymers and bioplastics is expanding rapidly as they make a significant contribution in reduction of environmental pollution. Bioplastics are completely decomposed into natural compounds by fungi, algae, and bacteria in a very short time under aerobic and anaerobic conditions. Bioplastics are categorized into three types namely, biodegradable, and biobased bioplastics (e.g., PLA, PHA, PGLA), nonbiodegradable and biobased bioplastics (e.g. Bio PE, Bio PET), and biodegradable and petroleum-based bioplastics (e.g. PCL, PBS, PBSA). Fungal degradation of bioplastics depends upon several physical, microbiological, and characteristic features of the polymer. The fungal strain-mediated biodegradation of bioplastics leads to the release of natural inorganic and inorganic compounds that do not negatively impact microbial diversity, nutrient cycle, and nitrogen content in the soil. This review highlights the impact of bioplastics on environmental sustainability and role of fungal biodegradation of bioplastics. The information provided in this review will help in development of more efficient strains of fungal as well as in research and development of bioplastic.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"733 - 745"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this contribution, we reported the investigation of EPDM rubber reinforced by talcum grafted polybutadiene (MSi-Talc). First, poly (3-methacryloxypropyltrimethoxysilane)-b-polybutadiene-b-poly(3-methacryloxypropyltrimethoxysilane) (PMSi-b-PB-b-PMSi) triblock copolymer was synthesized by esterification reaction and RAFT polymerization of 3-methacryloxypropyltrimethoxysilane. Second, talcum powder (Talc) was spraying with PMSi-b-PB-b-PMSi solution and drying to obtain modified talc (MSi-Talc). MSi-Talc and Talc were incorporated into EPDM simultaneously. It was found that Talc in the EPDM/MSi-Talc vulcanizates was much better distributed and dispersed than in the EPDM/Talc composites. Compared to Talc dispersion and Talc-rubber interaction of the EPDM/Talc composites, the mechanical properties (tensile strength, elongation at break, and tear strength) of the EPDM/MSi-Talc composites were significantly improved, and the compression set of the EPDM/MSi-Talc composites was greatly decreased and much lower than that of the EPDM/Talc composites.
{"title":"Grafting Polybutadiene onto Surfaces of Talcum Powder by Spray-Drying Technology and Modification of EPDM Rubber","authors":"Yuxing Wang, Qilai Wang, Suyuan Zhao, Houluo Cong, Yijun Chen, Xianrong Shen, Yixin Xiang","doi":"10.1134/S1560090424600116","DOIUrl":"10.1134/S1560090424600116","url":null,"abstract":"<p>In this contribution, we reported the investigation of EPDM rubber reinforced by talcum grafted polybutadiene (MSi-Talc). First, poly (3-methacryloxypropyltrimethoxysilane)-<i>b</i>-polybutadiene-<i>b</i>-poly(3-methacryloxypropyltrimethoxysilane) (PMSi-<i>b</i>-PB-<i>b</i>-PMSi) triblock copolymer was synthesized by esterification reaction and RAFT polymerization of 3-methacryloxypropyltrimethoxysilane. Second, talcum powder (Talc) was spraying with PMSi-<i>b</i>-PB-<i>b</i>-PMSi solution and drying to obtain modified talc (MSi-Talc). MSi-Talc and Talc were incorporated into EPDM simultaneously. It was found that Talc in the EPDM/MSi-Talc vulcanizates was much better distributed and dispersed than in the EPDM/Talc composites. Compared to Talc dispersion and Talc-rubber interaction of the EPDM/Talc composites, the mechanical properties (tensile strength, elongation at break, and tear strength) of the EPDM/MSi-Talc composites were significantly improved, and the compression set of the EPDM/MSi-Talc composites was greatly decreased and much lower than that of the EPDM/Talc composites.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"65 6","pages":"980 - 990"},"PeriodicalIF":1.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}