International Journal of Polymer Analysis and Characterization最新文献_第3页

Effect of heat treatment on charge states, thermophysical and mechanical properties of polypropylene doped with ZrO2 nanoparticles 热处理对掺杂 ZrO2 纳米粒子的聚丙烯的电荷状态、热物理性能和机械性能的影响

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2387605

Hijran S. Ibrahimova , Tahir D. Ibragimov

Charge states, thermophysical and mechanical properties of polypropylene doped with zirconium oxide nanoparticles, and their changes during heat treatment at temperatures 60 °C, 100 °C, and 140 °C are studied. The methods used are thermal stimulated depolarization (TSD), scanning differential calorimetry (SDC), and mechanical life assessment. It is shown that with an increase in the concentration of the filler, the intensity of the TSD peaks increases up to 3 vol.%. A further increase in concentration leads to a decrease in the intensity of the peaks. The activation energy of charge release from traps, temperature of maximum of the peaks, and the magnitude of the accumulated charge in the traps have also maximal value at nanoparticle concentration of 3 vol.%. The study of charge characteristics of the nanocomposite with concentration of 3 vol.% after heat treatment shows that the intensity of TSD peaks, the temperature of peak maxima, and the activation energy of charge release increase with increasing pretreatment temperature. The magnitude of the charge accumulated in traps has a maximal value at treatment temperature of 140 °C owing to the increase in the number of traps. The melting point of the composite is 149.38 °C and shifts to 146.88 °C after heat treatment at 140 °C. It indicates that the high temperature of heat treatment leads to partial destruction of polymer chains, leading to a decrease in the critical melting temperature. The mechanical durability of PP + 3%ZrO₂ nanocomposite decreases with increase in pretreatment temperature.

掺杂纳米氧化锆的聚丙烯的电荷状态、热物理性能和机械性能及其在 60 ℃、100 ℃ 和 140 ℃ 热处理过程中的变化...

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引用次数: 0

Improving flame resistance and shielding properties for cross-linked polyethylene (XLPE) using nanoclay filler 使用纳米粘土填料提高交联聚乙烯（XLPE）的阻燃性和屏蔽性能

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2394226

Elsayeda F. Salem , Walaa Abd-Elmonem Elkatan , Nesreen R. Abdel Wahab

Polymers play an essential role in both industry and medical fields due to their diverse and adaptable properties. In this work, prepared crosslinking polyethylene (XLPE) samples with hydrophilic bentonite nanoclay fillers (H₂Al₂O₆Si) at concentrations of 0, 1, 2.5, 4, and 5 wt% enhance their flame-retardant and radiation shielding efficiency. The research investigated flame retardancy and thermal stability parameters. The XLPE/H₂Al₂O₆Si nanocomposite polymer sheets were exposed to a collimated beam of fast neutrons using an Am/Be neutron source (5 Ci) and to gamma radiation using a ¹³⁷Cs point source (5 μCi) to assess their radiation shielding properties. The study found that uniform dispersion of nanoclay particles enhanced the thermal properties of the composite, forming a char layer that acted as a barrier, slowing thermal decomposition and reducing the heat release rate. Limiting oxygen index (LOI) increased from 28% to 34%, and burning rate improved with higher nanoclay concentrations. Additionally, absorption and optical band gap calculations decreased with increasing filler concentrations. Radiation attenuation capabilities increased by approximately 40% for neutrons and 30% for gamma radiation compared to pure XLPE. The study concluded that incorporating nanoclay fillers into XLPE enhances its shielding capabilities and improves flame resistance properties, making the prepared samples suitable for various industrial applications.

聚合物因其多样化和适应性强的特性，在工业和医疗领域都发挥着至关重要的作用。在这项工作中，制备了具有亲水性的交联聚乙烯（XLPE）样品。

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引用次数: 0

Response surface methodology-based preparation of sago starch bioplastic film for food packaging 基于响应面方法制备食品包装用西米淀粉生物塑料薄膜

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2383480

Shikha Guleria , Harpreet Singh , Atul Jain , Shailendra Kumar Arya , Sanjeev Puri , Madhu Khatri

The increase in the use of plastics during the past few decades has caused environmental pollution due to the non-biodegradable and recalcitrance nature of the plastics. This has caused great problems for the solid waste management efforts. The development of biodegradable polymers from natural and renewable ingredients can address the challenges caused by plastic pollution. The present work deals with the optimization of the preparation process of sago starch-based biodegradable bioplastic films. The sago starch, glycerol-sorbitol mixture, and chitosan were used as polysaccharides, plasticizers, and antimicrobial agents, respectively. The factors screening and design optimization were performed using response surface methodology and Box-Behnken Design to investigate the interactions between all components in the film preparation. Furthermore, the developed bioplastic films were characterized through field emission scanning electron microscopy and Fourier transform infrared spectroscopy. The antimicrobial susceptibility assay showed the inhibition of the growth of Bacillus pumilus and Alcaligenes faecalis XF1 by incorporation of cinnamon essential oil into the film. Moreover, the developed films successfully reduced the proliferation of fungal growth on packaged bread samples. The microbial analysis found that the shelf life of the wheat bread was improved from 3 to 15 days. The sago starch bioplastic films developed in this study can potentially meet the requirements for food packaging films.

由于塑料具有不可生物降解和难降解的特性，过去几十年中塑料使用量的增加造成了环境污染。这给固体废物管理工作带来了很大的问题。利用天然和可再生成分开发生物可降解聚合物可以解决塑料污染带来的挑战。本研究涉及西米淀粉基生物可降解生物塑料薄膜制备工艺的优化。西米淀粉、甘油-山梨醇混合物和壳聚糖分别用作多糖、增塑剂和抗菌剂。采用响应面法和箱-贝肯设计法进行了因素筛选和优化设计，以研究制备薄膜过程中所有成分之间的相互作用。此外，还通过场发射扫描电子显微镜和傅立叶变换红外光谱对所制备的生物塑料薄膜进行了表征。抗菌药敏试验表明，在薄膜中加入肉桂精油可抑制枯草芽孢杆菌和粪肠球菌 XF1 的生长。此外，开发的薄膜还成功地减少了包装面包样品上真菌的增殖。微生物分析发现，小麦面包的保质期从 3 天延长到了 15 天。本研究开发的西米淀粉生物塑料薄膜有可能满足食品包装薄膜的要求。

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引用次数: 0

Effect of titanium dioxide nanoparticles on the dielectric, thermal, and corrosion resistance properties of polyimide (PI) nanocomposites 二氧化钛纳米粒子对聚酰亚胺 (PI) 纳米复合材料介电性能、热性能和耐腐蚀性能的影响

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2394225

Victor Ekene Ogbonna , Olawale Popoola , Patricia Popoola

In the present study, the effect of varying titanium dioxide (TiO₂) nanoparticles on the dielectric, thermal, and corrosion characteristics of PI-based composites prepared by spark plasma sintering was investigated. The results obtained revealed that the TiO₂ nanoparticles were uniformly dispersed within the PI matrix. Addition of TiO₂ into the neat PI markedly reduced its dielectric constant and electrical conductivity by 72.7% and 82.3%, respectively, as well as enhancing its breakdown strength by 16.7% at 8 wt% TiO₂ loading. The nanocomposites depict better thermal stability and heat-resistance index characteristics when compared to the PI. Additionally, the produced nanocomposites exhibit improved corrosion resistance than that of the neat PI. The remarkable improvement in the dielectric, thermal stability, and corrosion resistance of the nanocomposites is achieved by better dispersion of the TiO₂ particles in the polymer matrix. The enhancement in properties suggests TiO₂/PI-based nanocomposites potential for a variety of applications in electrical insulation, thermal management, and harsh environment.

在本研究中，不同的二氧化钛（TiO2）纳米粒子对火花等离子烧结法制备的聚氨酯基复合材料的介电、热和腐蚀特性的影响...

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引用次数: 0

Hematite (Fe2O3)-modified biopolymer for Rhodamine B degradation under visible light 在可见光下降解罗丹明 B 的赤铁矿（Fe2O3）改性生物聚合物

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2383846

K. Beyaz , Y. Abdi , R. Bagtache , M. Trari , A. Benaboura

This study deals with the preparation of a novel biomaterial by incorporating the hematite α-Fe₂O₃ onto crushed leaves of the Washingtonia filifera palm tree in their raw state and in extracted cellulose from the same plant. The incorporation of α-Fe₂O₃ was accomplished by hydrothermal route at 200 °C. The palm leaves, extracted cellulose, and synthesized products were characterized by thermal analysis (TG) and FT-IR spectroscopy. The latter revealed peaks at 524 and 449 cm⁻¹ for the synthesized material, attributed to vibrational deformation of the inorganic Fe-O bond. In contrast to the TG profile of raw palm leaves, the thermogram of the composite degrades in a single step at 343 °C. This one-step decomposition clearly indicates the chemical modification of our cellulose matrix and confirms the successful incorporation of the hematite α-Fe₂O₃ into the lignocellulose. The second part is devoted to α-Fe₂O₃ working as sensitizer in photocatalysis, it was characterized optically (E g= 1.94 eV) and electrochemically with a flat band potential of −0.53 V_SCE. The conduction band (−0.73 VSCE) is more cathodic than the potential of the O₂/O₂^•− couple (−0.52 VSCE) and should reduce dissolved oxygen into reactive O₂^•− radical. The as-prepared materials were successfully tested in the photocatalytic degradation of Rh B (10 ppm) and the result gave an abatement of 60% on α-Fe₂O₃/lignocellulose under visible light irradiation (LED lamp) with a flux of 23 mW cm⁻². The kinetic obeys a first-order model with a half photocatalytic-life of ∼ 7 h.

本研究通过将赤铁矿α-Fe2O3加入到华盛顿(Washingtonia filifera)棕榈树的原叶和提取物中，制备出一种新型生物材料。

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引用次数: 0

Optimization of Yucca filamentosa fiber based graft copolymer through response surface methodology and evaluation of physico-chemical properties 通过响应面方法优化丝兰纤维基接枝共聚物并评估其物理化学性能

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-10-02 DOI: 10.1080/1023666X.2024.2377645

Surjit Kaur , Mithu Maiti Jana

The study of the physico-chemical modification of Yucca filamentosa (Yf) natural fiber by graft copolymerization with ethylmethacrylate using ferrous ammonium sulfate-potassium persulfate as a redox initiator has been reported in the article. Initially, six process parameters; reaction duration, reaction temperature, solvent amount, pH, FAS:KPS ratio, and monomer concentration were used in the study in a sequential experimental design technique, and the significant process variables affecting the yield of the graft copolymer were identified. The Resolution-V design method identified the significant parameters as the reaction temperature, amount of solvent, and the concentration of monomer. In second phase of the study, the screened variables were utilized in the development of a model through the technique of response surface methodology (RSM) for the prediction of the yields, and its optimization. The developed RSM model fitted well with the experimental data, and predicted for the optimal conditions of reactions as temperature 50 °C, solvent 100 ml, and the monomer 3.05 × 10⁻³mol/L; at which the highest graft yield percentage obtained was 124.2%. The techniques of FTIR, SEM, and XRD were used for the characterization graft copolymers. Studies of the various physico-chemical properties showed that the produced graft copolymers were more resistant than the natural fibers.

以硫酸亚铁铵-过硫酸钾为重做剂，通过与甲基丙烯酸乙酯的接枝共聚对丝兰（Yucca filamentosa，Yf）天然纤维进行物理化学改性的研究...

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引用次数: 0

Hybrid polymer composites of Terminalia chebula filler reinforced thermal and mechanical characterization of bagasse/tamarind seed 蔗渣/罗望子填料增强的杂化聚合物复合材料的热学和力学性能表征

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-09-30 DOI: 10.1080/1023666X.2024.2399219

R. Udhayasankar , B. Karthikeyan , K. Murugan , A. Balaji

The development of manufacturing industries is crucial for national progress, with a growing emphasis on green and sustainable practices. This study investigates the development and performance of hybrid polymer composites based on poly lactic acid (PLA) reinforced with lignocellulosic fillers: bagasse fiber (BF), tamarind seed fiber (TSF), Terminalia chebula fiber (TCF), and a hybrid filler of bagasse, tamarind seed, and Terminalia chebula (BTSTCF). Five types of composites were fabricated with varying filler compositions: PLA, PLA/BF, PLA/TSF, PLA/TCF, and PLA/BTSTCF, consisting of 30% BF, TSF, or TCF with 70% PLA, and an additional 10% of each filler in the BTSTCF composite. The results demonstrated that the PLA/BTSTCF hybrid composite outperformed others regarding mechanical strength, thermal stability, and interfacial adhesion. Specifically, it exhibited superior flexural strength, impact strength, and tensile strength. The findings indicate that incorporating a combination of bagasse, tamarind seed, and Terminalia chebula fillers into PLA significantly enhances its properties and performance. This study contributes to advancing sustainable and green manufacturing practices and holds promise for economic growth through the development of high-performance, eco-friendly materials.

随着对绿色和可持续发展实践的日益重视，制造业的发展对国家进步至关重要。本研究探讨了基于聚乳酸（PLA）与木质纤维素填料（蔗渣纤维（BF）、罗望子纤维（TSF）、星云木纤维（TCF）以及蔗渣、罗望子和星云木混合填料（BTSTCF））增强的混合聚合物复合材料的开发和性能。利用不同的填料成分制造了五种类型的复合材料：聚乳酸、聚乳酸/BF、聚乳酸/TSF、聚乳酸/TCF 和聚乳酸/BTSTCF，其中 BF、TSF 或 TCF 占 30%，聚乳酸占 70%，BTSTCF 复合材料中每种填料各占 10%。结果表明，聚乳酸/BTSTCF 混合复合材料在机械强度、热稳定性和界面粘附性方面均优于其他材料。具体来说，它在弯曲强度、冲击强度和拉伸强度方面都表现优异。研究结果表明，在聚乳酸中加入甘蔗渣、罗望子和星云木填料可显著提高聚乳酸的性能和表现。这项研究有助于推进可持续发展和绿色制造实践，并有望通过开发高性能、生态友好型材料促进经济增长。

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引用次数: 0

Dynamic mechanical analysis of additively manufactured cenosphere-filled PETG syntactic foam composite 增材制造仙人球填充 PETG 合成泡沫复合材料的动态力学分析

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-09-26 DOI: 10.1080/1023666X.2024.2404906

Jitendra Kumar , Sushant Negi

Syntactic foam composite (SFC) has the potential to substitute the conventional material used in damage-tolerance, thermal insulation, and weight-sensitive applications such as automotive parts, submarine structures, etc. Here, SFCs were developed by varying the weight fraction of cenosphere (CS) content from 0-40 wt. % in a polyethylene terephthalate glycol (PETG) matrix. This investigation provides the terse behavior of the viscoelastic properties of 3D-printed PETG/CS foam composites. The thermogravimetric analysis (TGA) results showed that the initial degradation temperature (T_i) and the temperature at 50% mass loss (T₅₀) of the composite filament increased with the addition of CS particles, indicating improved thermal stability. The dynamic mechanical analysis (DMA) results revealed that the storage modulus of SFC increased with increasing cenosphere content. The foam composite’s glass transition temperature (78.9 ± 0.35 °C) is lower by 4 °C than pure PETG. This underscores the potential of the developed syntactic foam composite to effectively utilize industrial waste fly ash through 3D printing routine, thereby promoting sustainable manufacturing practices.

合成泡沫复合材料（SFC）具有替代传统材料的潜力，可用于耐损伤、隔热和对重量敏感的应用领域，如汽车零件、潜艇结构等。在这里，通过改变聚对苯二甲酸乙二醇（PETG）基体中的碳圈（CS）重量分数（0-40 wt.%），开发出了 SFC。这项研究提供了三维打印 PETG/CS 泡沫复合材料粘弹性能的简明行为。热重分析（TGA）结果表明，复合丝的初始降解温度（Ti）和质量损失 50%时的温度（T50）随着 CS 粒子的加入而升高，表明热稳定性得到改善。动态力学分析（DMA）结果表明，SFC 的存储模量随纤球含量的增加而增加。泡沫复合材料的玻璃化转变温度（78.9 ± 0.35 °C）比纯 PETG 低 4 °C。这凸显了所开发的合成泡沫复合材料通过三维打印程序有效利用工业废弃粉煤灰的潜力，从而促进了可持续生产实践。

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引用次数: 0

Evaluation of dimensional stability, setting time, tensile strength, and rheological properties of kaolin clay incorporated alginate impression material 评估高岭土掺入藻酸盐印模材料的尺寸稳定性、凝固时间、拉伸强度和流变特性

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-09-17 DOI: 10.1080/1023666X.2024.2398152

Sumbal Anwar , Saad Liaqat , Riaz Ullah , Zafar Iqbal , Fozia Rahman , Essam A. Ali , Umar Nishan , Sandleen Feroz , Nawshad Muhammad

This study aims to determine and compare the dimensional stability, setting time, tensile strength, and rheological properties of kaolin clay powder-modified and unmodified alginate impression material. Commercially available alginate-based impression material was considered as a control (C) while experimental groups E-1, E-2, and E-3 were fabricated by adding 2%, 4%, and 8% of kaolin clay powder in the control, respectively. Analytical techniques were used for the characterization of the samples. A tensile strength, rheological property, dimensional stability, and setting time were recorded for control and experimental groups. FTIR analysis confirmed the presence of kaolin clay powder in all experimental groups. SEM showed a round solid structure and irregular shape particle appearance in all experimental groups as well as a control group. The dimensional stability was improved by the addition of kaolin clay powder to the alginate impression material. The percentage dimensional change at 5 min, 6, and 12 h was increased for E3 adding (8% kaolin clay powder) and decreased for the control group. The mean value of tensile strength was highest for E3 followed by E2, E1, and least in control groups. Higher Young’s Modulus and lower deformation values were measured for E3. The mean value of setting time was highest for E3 and the least was in the control group. The results for both setting time and tensile strength were very highly statistically significant (p < 0.001). The mean values of viscoelasticity, flow, and drip test were increased statistically by adding various concentrations of kaolin clay powder to the alginate impression material.

本研究旨在确定并比较高岭土粉末改性和未改性海藻酸盐印模材料的尺寸稳定性、凝固时间、拉伸强度和流变特性。市售的藻酸盐印模材料被视为对照组（C），而实验组 E-1、E-2 和 E-3 则分别在对照组中添加了 2%、4% 和 8% 的高岭土粉末。样品的表征采用了分析技术。记录了对照组和实验组的拉伸强度、流变特性、尺寸稳定性和凝固时间。傅立叶变换红外光谱分析证实了所有实验组都含有高岭土粉末。扫描电镜显示，所有实验组和对照组的颗粒外观均为圆形固体结构，形状不规则。在藻酸盐印模材料中加入高岭土粉末后，尺寸稳定性得到了改善。添加 E3（8% 的高岭土粉末）的实验组在 5 分钟、6 小时和 12 小时后的尺寸变化百分比都有所增加，而对照组则有所减少。E3 组的拉伸强度平均值最高，其次是 E2 组和 E1 组，而对照组的拉伸强度平均值最低。E3 的杨氏模量较高，变形值较低。E3 的凝结时间平均值最高，而对照组最小。凝结时间和拉伸强度的结果都具有非常显著的统计学意义（p < 0.001）。在藻酸盐印模材料中添加不同浓度的高岭土粉末后，粘弹性、流动性和滴落试验的平均值均有统计学意义的增加。

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引用次数: 0

Fabrication and performance of short glass fiber reinforced polyamide composites 短玻璃纤维增强聚酰胺复合材料的制造和性能

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization

Pub Date : 2024-09-13 DOI: 10.1080/1023666X.2024.2394222

Bedriye Ucpinar Durmaz , Elnura Artykbaeva , Ayse Aytac

This article deals with the impact of short glass fiber (GF) on the performance of 60/40 wt% of polyamide 6/polyamide 12 (PA6/PA12) blend. The short fiber-reinforced composites were fabricated by using melt compounding via twin screw extruder and injection molding. The morphological, water uptake, rheological, thermo-mechanical, and mechanical properties of the composites were discussed. The morphological observations show that the PA6/PA12 blend exhibited compatible morphology and also adhesion between the fiber and matrix was quite strong. The tensile strength/modulus and storage modulus of the blend were substantially improved with GF reinforcement as a result of these morphological findings. While the water uptake of neat PA6 decreased significantly after blending with PA12, the incorporation of GF further reduced the water uptake of the PA6/PA12 blend. The thermomechanical analysis showed the enhancement of the stiffness of the composites and also glass transition temperature increment.

本文探讨了短玻璃纤维（GF）对 60/40 wt%聚酰胺 6/ 聚酰胺 12（PA6/PA12）混合物性能的影响。短纤维增强复合材料是通过双螺杆挤出机熔融共混和注塑成型制成的。对复合材料的形态、吸水性、流变学、热力学和机械性能进行了讨论。形态观察结果表明，PA6/PA12 共混物呈现出兼容形态，纤维与基体之间的粘附力也相当强。由于这些形态学发现，在添加 GF 增强材料后，共混物的拉伸强度/模量和存储模量得到了大幅提高。与 PA12 共混后，纯 PA6 的吸水率明显降低，而 GF 的加入则进一步降低了 PA6/PA12 共混物的吸水率。热力学分析表明，复合材料的刚度提高了，玻璃化转变温度也提高了。

引用次数: 0