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Heat Resistance of Adhesive Joints of Heterocyclic Aramid Fibers under Static Load 杂环芳纶纤维粘合接头在静载荷下的耐热性能
IF 1 4区 化学 Q3 Materials Science Pub Date : 2024-02-11 DOI: 10.1134/s0965545x23600667
S. V. Kotomin, Ya. V. Golubev, A. A. Gurov, I. M. Obidin

Abstract

The heat resistance of adhesive joints of SVM heterocyclic aramid fibers and cyanoacrylate glue has been studied based on the adhesion failure temperature in an adhesion cell formed by a loop tightened into a knot. For the first time, data on the heat resistance of adhesive joints of fibers with a polymer matrix under static load with constant shear stress have been obtained. Using the example of two types of glue, the influence of filler in the glue and fibers on the glass transition temperature of polycyanoacrylate and the heat resistance of the adhesive joint is shown. The activation energy of adhesion failure was calculated, and the dependence of the thermal stability of the adhesive joint on the shear stress was shown to be of the Arrhenius type.

摘要 研究了 SVM 杂环芳纶纤维和氰基丙烯酸酯胶水粘合接头的耐热性,其依据是由拉紧成结的线圈形成的粘合单元中的粘合失效温度。首次获得了纤维与聚合物基体粘合接头在恒定剪切应力静载荷下的耐热性数据。以两种胶水为例,说明了胶水和纤维中的填料对聚氰基丙烯酸酯玻璃化转变温度和粘合接头耐热性的影响。计算了粘合失效的活化能,并证明粘合接头的热稳定性与剪切应力的关系属于阿伦尼乌斯类型。
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引用次数: 0
A Review on Engineering of Poly(Glycidyl Methacrylate) Microspheres 聚(甲基丙烯酸缩水甘油酯)微球工程学综述
IF 1 4区 化学 Q3 Materials Science Pub Date : 2024-02-09 DOI: 10.1134/s0965545x23600606

Abstract

The poly(glycidyl methacrylate) microsphere (PGMA microsphere) is one of the most useful colloidal particles due to its structural arrangement. It has an easy functionalization, dispersion, adsorption and swelling properties. The PGMA was effectively used as a precursor for the development of many novel and advanced materials with enhanced properties lead to diverse applications. For instance, the incorporation of nanoparticles in PGMA exhibited progressive properties. Nevertheless, homogeneous distribution of nanoparticles in polymers is not that much simple due to their tendency to get aggregate. Whereas, the homogeneous distribution of nanoparticles in the PGMA is quite easy due to its grafting ability. The design, development and characterization of PGMA based novel materials for improved properties and apply those materials for diverse problems has gained a great interest among the researchers from the past one decade. This review highlights the insights on different methods of preparation of PGMA based materials to attain the desired properties and provide useful information about the characteristic features of the PGMA microspheres. This review also useful to evaluate some of the key aspects for the development of PGMA based materials and endow with new possible ways and ideas to take up some innovative research.

摘要 聚甲基丙烯酸缩水甘油酯微球(PGMA 微球)因其结构排列而成为最有用的胶体粒子之一。它具有易于官能化、分散、吸附和溶胀的特性。PGMA 被有效地用作前驱体,用于开发许多具有增强性能的新型先进材料,从而实现了多种应用。例如,在 PGMA 中掺入纳米颗粒后,其性能会逐渐提高。然而,由于纳米粒子容易聚集,因此在聚合物中均匀分布纳米粒子并不简单。而由于 PGMA 具有接枝能力,纳米粒子在 PGMA 中的均匀分布非常容易。在过去的十年中,研究人员对基于 PGMA 的新型材料的设计、开发和表征产生了浓厚的兴趣。本综述重点介绍了制备 PGMA 基材料以获得所需性能的不同方法,并提供了有关 PGMA 微球特征的有用信息。本综述还有助于评估开发 PGMA 基材料的一些关键方面,并为开展创新研究提供新的可行方法和思路。
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引用次数: 0
Phase Transitions and Thermodynamic Interaction Parameters of Components in Poly(methyl methacrylate) and Poly(vinyl acetate) 聚(甲基丙烯酸甲酯)和聚(醋酸乙烯酯)中各成分的相变和热力学相互作用参数
IF 1 4区 化学 Q3 Materials Science Pub Date : 2024-02-09 DOI: 10.1134/s0965545x2360059x
S. A. Vshivkov, E. V. Rusinova

Abstract

Phase diagrams with UCST are constructed for systems poly(methyl methacrylate)–butanol, poly(vinyl acetate)–methanol, and poly(vinyl acetate)–2-propanol. The boundary curve of the PMMA–о-xylene system is unusual in shape, which is explained by the fact that polymer macromolecules form stereo complexes that appear during solution cooling. The thermodynamic interaction parameters χ of components and the values of χcr and critical concentration of the systems under study are calculated. With increasing temperature the value of χ decreases, which indicates that the interaction of components is improved under heating and agrees with the phase diagrams of the systems.

摘要 利用 UCST 绘制了聚甲基丙烯酸甲酯-丁醇、聚醋酸乙烯酯-甲醇和聚醋酸乙烯酯-2-丙醇体系的相图。聚甲基丙烯酸甲酯-о-二甲苯体系的边界曲线形状异常,其原因是聚合物大分子在溶液冷却过程中形成了立体复合物。计算了所研究体系中各组分的热力学相互作用参数 χ 以及 χcr 值和临界浓度。随着温度的升高,χ 值减小,这表明在加热过程中各组分的相互作用得到了改善,并与各体系的相图相吻合。
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引用次数: 0
Complexes of an Anionic Surfactant with Chitosan and Its Hydrophobic Derivatives As Disinfectants against SARS-CoV-2 阴离子表面活性剂与壳聚糖及其疏水性衍生物的复合物作为抗 SARS-CoV-2 的消毒剂
IF 1 4区 化学 Q3 Materials Science Pub Date : 2024-01-09 DOI: 10.1134/s0965545x23600503
A. V. Shibaev, A. S. Ospennikov, G. V. Kornilaeva, V. F. Larichev, I. T. Fedyakina, Lifeng Fu, Zhuo Chen, Yangyang Yang, E. V. Karamov, Ali S. Turgiev, Liping Duan, Jun Liu, O. E. Philippova

Abstract

This work is aimed at the preparation of complexes of chitosan and hydrophobically modified (HM) chitosan with an anionic surfactant sodium dodecylbenzene sulfonate (SDBS), and at the study of the virucidal activity of the complexes and their components against SARS-CoV-2. It is shown that the introduction of a sufficient amount (4 mol%) of hydrophobic n-dodecyl side groups provides the activity of HM chitosan against SARS-CoV-2 at moderate concentrations, at which unmodified chitosan and chitosan containing a lower amount of hydrophobic groups do not show any activity. Complexes of HM chitosan with SDBS are prepared, which is proven by fluorescence spectroscopy and isothermal titration calorimetry. It is discovered that HM chitosan/SDBS complex is more active than the polymer without surfactant, and an increase of the amount of hydrophobic groups enhances the activity.

摘要 本研究旨在制备壳聚糖和疏水改性(HM)壳聚糖与阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的复合物,并研究复合物及其组分对 SARS-CoV-2 的杀病毒活性。结果表明,引入足量(4 摩尔%)的疏水性正十二烷基侧基,可使 HM 壳聚糖在中等浓度下具有抗 SARS-CoV-2 的活性,而未改性壳聚糖和含有较少量疏水性基团的壳聚糖则不具有任何活性。研究人员制备了 HM 壳聚糖与 SDBS 的络合物,荧光光谱和等温滴定量热法证明了这一点。研究发现,HM 壳聚糖/SDBS 复合物的活性高于不含表面活性剂的聚合物,而疏水基团数量的增加会提高其活性。
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引用次数: 0
Energy of Salt Formation and Supramolecular Ordering of Chitosan L- and D-Ascorbates 壳聚糖 L-和 D-抗坏血酸盐的成盐能量和超分子有序化
IF 1 4区 化学 Q3 Materials Science Pub Date : 2024-01-09 DOI: 10.1134/s0965545x23600497
O. N. Malinkina, A. B. Shipovskaya

Abstract

Using two samples of chitosan (D-glucan) with viscosity-average molecular mass 40 × 103 and 200 × 103 as the example, the influence of diastereomer form (L- and D-) of ascorbic acid on the energetics of formation, structure, and supramolecular ordering of hetero- (D‒L) and homochiral (D‒D) polymer–acid salt complexes has been studied. It has been found that heat effect during the interaction of chitosan with L-ascorbic acid in aqueous medium and degree of protonation of the (D‒L)-salts are lower in comparison with D-isomer of the acid. The homochiral (D‒D)-salts, in contrast to the heterochiral (D‒L)-salts, have exhibited lower amount of crystallization water, high degree of crystallinity, and denser supramolecular structure with high level of inter- and intramolecular contacts.

摘要 以粘均分子量分别为40×103和200×103的两种壳聚糖(D-葡聚糖)为例,研究了抗坏血酸非对映异构体(L-和D-)对异(D-L)和同(D-D)手性聚合物-酸盐复合物的形成能、结构和超分子排序的影响。研究发现,壳聚糖与 L-抗坏血酸在水介质中相互作用时的热效应以及 (D-L) 盐的质子化程度均低于该酸的 D-异构体。与异手性(D-L)盐相比,同手性(D-D)盐的结晶水含量低,结晶度高,超分子结构更致密,分子间和分子内接触程度高。
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引用次数: 0
Bio-based Polymers: a Review on Processing and 3D Printing 生物基聚合物:加工与 3D 打印综述
IF 1 4区 化学 Q3 Materials Science Pub Date : 2023-12-11 DOI: 10.1134/s0965545x2360045x
Sabana Ara Begum, P. S. G. Krishnan, K. Kanny
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引用次数: 0
Preparation of Ecofriendly Viable Packaging Films Based on Pectin and Agro-Waste: Thermal and Mechanical Studies by Design of Experiments Approach 基于果胶和农业废弃物的生态友好型可存活包装膜的制备:通过实验设计法进行热学和力学研究
IF 1 4区 化学 Q3 Materials Science Pub Date : 2023-12-11 DOI: 10.1134/s0965545x23600448
Vinod Kumar, Sohan Lal, Sumit Kumar, Geetanjali Jagdeva, Parvin Kumar, Anjali Verma, Anton Kuzmin

Abstract

The use of synthetic single used plastic packaging and mulching films has serious environmental effects due to their non-degradable waste causing pollution. To replace these synthetic materials, high-strength biodegradable polymer composites of Pectin, Luffa Fiber (agro-waste) and Glycerol are synthesized by the solvent casting technique using a universal solvent. The experimentation is carried out using a 3 × 3 factorial design and the tensile behavior (tensile strength and elongation) of composites is analyzed by response surface methodology (RSM). The tensile strength of pectin containing 10% glycerol is 11.48 MPa which is increased to 19.34 MPa by incorporation of 15% luffa fiber and this composition is optimized with desirability index method (simultaneously optimization) to achieve the best results for elongation at break (188.89%) as well. The interactions between constituents of composites are characterized by FTIR spectro-scopy and scanning electron microscopic study reveals a uniform distribution of fiber. The composites have sustained thermal stability as all composites are stable up to 260°C in an inert atmosphere under TGA study. The biodegradability of composite films was observed by soil burial method and found completely degradable in 75 days. The present composites of non-toxic components with high tensile properties, sustained thermal stability and complete biodegradability are suitable for green packaging applications.

摘要 使用合成的一次性使用过的塑料包装和地膜,由于其不可降解的废物造成污染,对环境产生了严重影响。为了替代这些合成材料,本研究采用通用溶剂,通过溶剂浇注技术合成了果胶、丝瓜纤维(农业废弃物)和甘油的高强度生物可降解聚合物复合材料。实验采用 3 × 3 因式设计,并通过响应面方法(RSM)分析了复合材料的拉伸行为(拉伸强度和伸长率)。含有 10%甘油的果胶的拉伸强度为 11.48 兆帕,加入 15%丝瓜纤维后,拉伸强度增加到 19.34 兆帕,采用理想指数法(同时优化)对该成分进行优化,使断裂伸长率(188.89%)达到最佳结果。傅立叶变换红外光谱分析了复合材料成分之间的相互作用,扫描电子显微镜研究显示纤维分布均匀。复合材料具有持续的热稳定性,在惰性气氛下,所有复合材料在 260°C 的温度下都能保持稳定的热稳定性。通过土壤掩埋法观察了复合薄膜的生物降解性,发现其可在 75 天内完全降解。这种无毒成分的复合材料具有高拉伸性能、持续热稳定性和完全生物降解性,适用于绿色包装应用。
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引用次数: 0
Effects of Graphene Oxide Dimension on the Mechanical and Dielectric Properties of Epoxy Resin 石墨烯氧化物尺寸对环氧树脂机械性能和介电性能的影响
IF 1.206 4区 化学 Q3 Materials Science Pub Date : 2023-12-01 DOI: 10.1134/s0965545x24600066

Abstract

To study the effects of graphene oxide (GO) dimension on the mechanical and dielectric performance of epoxy resin (EP), two kinds of GO with different dimensions were selected and characterized by Fourier transform infrared spectrometer (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results showed that the two kinds of GO had similar chemical structure, but different average particle sizes of 190.1 nm (SGO) and 1510 nm (MGO), respectively. The mechanical properties, dynamic mechanical properties, and dielectric properties of the EP/GO composites are analyzed using electronic universal testing machine, Rockwell hardness tester, dynamic mechanical analysis (DMA) and broadband dielectric impedance relaxation spectrometer. Results revealed that the GO dimension plays important role in determining the dispersion of the filler in EP matrix, and further determines the mechanical properties and dielectric performance of the composites. EP/SGO with better dispersion of GO in the EP matrix exhibits better mechanical properties, higher glass transition temperature, higher dielectric constant. Related mechanism has been proposed.

摘要 为研究氧化石墨烯(GO)尺寸对环氧树脂(EP)机械性能和介电性能的影响,选取了两种不同尺寸的氧化石墨烯(GO),并通过傅立叶变换红外光谱仪(FTIR)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)和 X 射线衍射仪(XRD)对其进行了表征。结果表明,两种 GO 具有相似的化学结构,但平均粒径不同,分别为 190.1 nm(SGO)和 1510 nm(MGO)。使用电子万能试验机、洛氏硬度计、动态力学分析(DMA)和宽带介电阻抗弛豫光谱仪分析了 EP/GO 复合材料的力学性能、动态力学性能和介电性能。结果表明,GO 尺寸在决定填料在 EP 基体中的分散性方面起着重要作用,并进一步决定了复合材料的机械性能和介电性能。EP/SGO 在 EP 基体中的分散性越好,其力学性能越好,玻璃化转变温度越高,介电常数越大。提出了相关的机理。
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引用次数: 0
Investigation on Structural, Electrical and Dielectric Properties of Polyaniline/ZrO2 Composite 聚苯胺/氧化锆复合材料的结构、电气和介电特性研究
IF 1.206 4区 化学 Q3 Materials Science Pub Date : 2023-12-01 DOI: 10.1134/s0965545x2460025x

Abstract

The effect of ZrO2 nanoparticles on the structural, electrical, and dielectric properties of polyaniline was studied. ZrO2 nanoparticles with an average size of 8 nm were synthesized by a simple precipitation method and their tetragonal and monoclinic crystalline phase was confirmed. Polyaniline and its nanocomposite with ZrO2 have been synthesized by chemical oxidation method using CH3COOH as a doping agent and APS as an oxidant. The synthesized composites were analyzed by infrared spectroscopy, X-ray diffraction, scanning electronic microscopy, AC conductivity, dielectric and impedance spectroscopy. In Nyquist plots, systematic decrement in the semicircle size was observed with growth of ZrO2 content. The dielectric constant in the PANI/ZrO2 composite has been increased with an increase in weight content of ZrO2 in PANI matrix and exhibited the Maxwell–Wagner–Sillars effect.

摘要 研究了 ZrO2 纳米粒子对聚苯胺结构、电学和介电性能的影响。采用简单的沉淀法合成了平均粒径为 8 nm 的 ZrO2 纳米粒子,并确认了它们的四方和单斜晶相。以 CH3COOH 为掺杂剂,APS 为氧化剂,通过化学氧化法合成了聚苯胺及其与 ZrO2 的纳米复合材料。对合成的复合材料进行了红外光谱、X 射线衍射、扫描电子显微镜、交流电导、介电和阻抗光谱分析。在奈奎斯特图中观察到,随着 ZrO2 含量的增加,半圆的尺寸系统性地减小。PANI/ZrO2 复合材料的介电常数随着 PANI 基体中 ZrO2 重量含量的增加而增加,并表现出 Maxwell-Wagner-Sillars 效应。
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引用次数: 0
Solid-Phase Production of Low-Density Polyethylene Compositions with Reduced Graphene Oxide under Shear Deformations 剪切变形下还原氧化石墨烯固相制备低密度聚乙烯复合材料
IF 1 4区 化学 Q3 Materials Science Pub Date : 2023-11-30 DOI: 10.1134/s0965545x23701195
M. M. Gasymov, S. Z. Rogovina, O. P. Kuznetsova, V. G. Shevchenko, A. A. Berlin

Abstract

Nanocomposites of low-density polyethylene (LDPE) with a nanocarbon nanofiller, reduced graphene oxide (RGO) of different composition, have been obtained under conditions of high-temperature shear deformations in a rotary disperser. Structure and properties of the obtained nanocomposites have been studied using a wide range of physico-chemical methods of analysis, including laser diffraction, scanning electron microscopy, and measurement of mechanical and electrical parameters. The influence of the components ratio in the compositions on the characteristics of the resulting materials has been demonstrated.

摘要在旋转分散器高温剪切变形条件下,制备了低密度聚乙烯(LDPE)与不同成分的纳米碳纳米填料还原氧化石墨烯(RGO)的纳米复合材料。所获得的纳米复合材料的结构和性能已经使用广泛的物理化学分析方法进行了研究,包括激光衍射,扫描电子显微镜,以及机械和电气参数的测量。研究了合成物中各组分的配比对所得材料性能的影响。
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引用次数: 0
期刊
Polymer Science, Series A
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