Polymer Testing最新文献_第4页

Recent advancements in bio-based plasticizers for polylactic acid (PLA): A review 用于聚乳酸（PLA）的生物基增塑剂的最新进展：综述

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-10-04 DOI: 10.1016/j.polymertesting.2024.108603

Shiyan Sun, Yunxuan Weng, Caili Zhang

Research on bio-based plasticizers for polylactic acid (PLA), an environmentally friendly and biodegradable polyester, has advanced due to the increasing focus on sustainable materials. The brittleness of PLA has presented challenges in film production, prompting researchers to blend it with natural plasticizers such as vegetable oils and citrate to enhance flexibility and processing ease while maintaining biodegradability and safety. This review summarizes recent findings from the past five years on bio-based plasticizers for PLA, highlighting their impact on the physical properties of PLA. Despite the high cost associated with bio-based plasticizers, their market is anticipated to expand owing to the environmental benefits they provide. Primary challenges involve the advancement of bio-based plasticizers with superior performance, broadening the range of available feedstock choices, and performing economic evaluations to enhance competitiveness. In the future, research will focus on formulating plasticizers that offer added advantages such as enhanced toughness, antimicrobial features, and reduced migration, in line with the industry's growing emphasis on sustainability.

聚乳酸（PLA）是一种环保和可生物降解的聚酯，由于人们对可持续材料的日益关注，有关聚乳酸生物基增塑剂的研究也取得了进展。聚乳酸的脆性给薄膜生产带来了挑战，促使研究人员将其与植物油和柠檬酸盐等天然增塑剂混合，以提高柔韧性和加工便利性，同时保持生物降解性和安全性。本综述总结了过去五年中有关用于聚乳酸的生物基增塑剂的最新研究成果，强调了这些增塑剂对聚乳酸物理性质的影响。尽管生物基增塑剂的成本较高，但由于其具有环境效益，预计其市场将不断扩大。面临的主要挑战包括开发性能卓越的生物基增塑剂、扩大可用原料的选择范围以及进行经济评估以提高竞争力。未来，研究重点将放在增塑剂的配制上，这些增塑剂将提供更多优势，如增强韧性、抗菌功能和减少迁移，以符合行业对可持续发展的日益重视。

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引用次数: 0

Raw rubber network of acid-free natural rubber and its application with solution-polymerized styrene butadiene rubber in green tires 无酸天然橡胶的生橡胶网络及其与溶液聚合丁苯橡胶在绿色轮胎中的应用

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-10-02 DOI: 10.1016/j.polymertesting.2024.108605

Yao Xiao , Biao Li , Pengfei Diao , Yinggang Huang , Xiangxu Li , Chuansheng Wang , Huiguang Bian

Natural raw rubber was prepared by flash evaporation process (VNR), its raw rubber network was compared with that of acid-coagulated rubber (STR20), and the effects of the ratios of VNR and STR20 to SSBR on the comprehensive performance of green tire composites were investigated. The results showed that compared with 80SSBR composites, the tensile strength and tensile product coefficient of 80VNR composites were improved by 23 % and 94 %, and the Payne effect, compression heat generation, and rolling resistance were reduced by 39 %, 9 %, and 5 %, respectively. Compared with 40STR20/40SSBR composites, the tensile product coefficient, wear resistance, and wet skid resistance of 40VNR/40SSBR composites are increased by 11 %, 5 %, and 5 %, respectively, and the Payne effect, compression heat generation, and rolling resistance were reduced by 46 %, 11 %, and 5 %, respectively. This study increased the amount of natural rubber in the green tire formulations, improving the performance of composites while achieving sustainability.

采用闪蒸法制备天然生橡胶（VNR），比较其与酸凝橡胶（STR20）的生胶网络，研究VNR和STR20与SSBR的比例对绿色轮胎复合材料综合性能的影响。结果表明，与80SSBR复合材料相比，80VNR复合材料的拉伸强度和拉伸产品系数分别提高了23%和94%，佩恩效应、压缩发热量和滚动阻力分别降低了39%、9%和5%。与 40STR20/40SSBR 复合材料相比，40VNR/40SSBR 复合材料的拉伸产品系数、耐磨性和湿滑阻力分别提高了 11%、5% 和 5%，佩恩效应、压缩发热量和滚动阻力分别降低了 46%、11% 和 5%。这项研究增加了绿色轮胎配方中天然橡胶的用量，在提高复合材料性能的同时实现了可持续性。

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引用次数: 0

Experimental and analytical study on the compressive behavior of PMI foam with different densities and cell sizes under intermediate strain rates 不同密度和单元尺寸的聚甲基丙烯酸甲酯泡沫在中等应变速率下的压缩行为的实验和分析研究

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-10-02 DOI: 10.1016/j.polymertesting.2024.108593

Peilin Zhu, Jili Rong, Shenglong Wang, Zichao Chen

Polymethacrylimide (PMI) foam materials have great potential for applications in the field of protective energy absorption owing to their superior compressive properties. Existing studies on the mechanical behavior of PMI foams are limited, particularly for loading at intermediate strain rates. This paper presents a comprehensive experimental study of PMI foam with four different densities under quasi-static and intermediate strain rate compression (0.001 s⁻¹ to 100 s⁻¹). Each density included three different cell sizes to determine their effects on the compressive performance. Loads parallel and perpendicular to the foam rise direction were considered to investigate the anisotropic behavior. Intermediate strain rate tests were conducted using a high-speed hydraulic servo testing machine, which achieved a stable strain rate while ensuring consistent specimen sizes in both quasi-static and dynamic tests. In all the experiments, the compression process was captured using a high-speed camera and the macroscopic deformation mode and microscopic deformation mechanism were analyzed by combining Digital Image Correlation (DIC) and Scanning Electron Microscopy (SEM). The PMI foam with finer cell sizes exhibited an enhanced compression performance. As the strain rate increased, the strain rate effect became more evident in the high-density specimens and an increase in cell size diminished this effect. A modified analytical model incorporating the cell-size correction term was developed based on Gibson and Ashby's model. The modified model exhibited an average error of 4.9 % in the predicted plateau stress of PMI foam with different cell sizes at the same density.

聚甲基丙烯酰亚胺（PMI）泡沫材料因其卓越的抗压性能，在保护性能量吸收领域具有巨大的应用潜力。现有关于聚甲基丙烯酰亚胺泡沫材料力学行为的研究非常有限，尤其是在中等应变速率下的加载。本文介绍了在准静态和中等应变率压缩（0.001 s-1 至 100 s-1）条件下对四种不同密度的 PMI 泡沫进行的综合实验研究。每种密度包括三种不同的孔径，以确定它们对压缩性能的影响。为了研究各向异性行为，还考虑了与泡沫上升方向平行和垂直的载荷。中间应变速率试验使用高速液压伺服试验机进行，该试验机可实现稳定的应变速率，同时确保准静态和动态试验中试样尺寸的一致性。在所有试验中，都使用高速相机拍摄了压缩过程，并结合数字图像相关性（DIC）和扫描电子显微镜（SEM）分析了宏观变形模式和微观变形机制。孔径更细的 PMI 泡沫的压缩性能更佳。随着应变速率的增加，应变速率效应在高密度试样中变得更加明显，而细胞尺寸的增加则减弱了这种效应。在 Gibson 和 Ashby 模型的基础上，开发了一个包含单元尺寸修正项的修正分析模型。修改后的模型显示，在相同密度下，不同细胞尺寸的 PMI 泡沫的预测高原应力平均误差为 4.9%。

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引用次数: 0

The mesophase of PLA in binary materials with ATBC and in composites with ATBC and mesoporous MCM-41 聚乳酸与 ATBC 的二元材料以及 ATBC 与介孔 MCM-41 的复合材料中的中间相

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-09-28 DOI: 10.1016/j.polymertesting.2024.108602

Enrique Blázquez-Blázquez , Rosa Barranco-García , Tamara M. Díez-Rodríguez , María L. Cerrada , Ernesto Pérez

Several composites of an L-rich polylactide (PLA) with acetyl tri-n-butyl citrate (ATBC), and mesoporous particles of Mobil Composition of Matter No. 41 (MCM-41) have been prepared in order to overcome the important drawback of PLA related to its rather low crystallization rate. Additionally of solving that deficiency, the mesophase of PLA has been spontaneously formed in two specimens just by standing at room temperature. This finding was ascertained from the corresponding X-ray diffractograms, which are similar to those observed for the mesophase obtained by stretching experiments. When the mesophase is initially present, its nucleation ability for recrystallization is significantly higher than the one exhibited by amorphous samples, as shown by both DSC and real-time variable-temperature synchrotron diffraction experiments. Moreover, the mesophase displays relatively small values of the long spacing, around 10–11 nm, compared with the values of about 16–18 nm found in the crystals. On the other hand, the mesophase shows in most cases an intermediate degree of order between the amorphous and crystalline phases, as stated by FTIR measurements. Its most characteristic feature is the observation of a distinctive peak at 916 cm⁻¹, while the crystals show a specific peak at 923 cm⁻¹ for the α′ phase and at 921 cm⁻¹ for the α modification. The low-frequency region of the spectra below around 800 cm⁻¹, scarcely commented in literature, has also been found especially sensitive to ordering.

为了克服聚乳酸结晶率低这一重要缺点，我们制备了几种富含 L 的聚乳酸（PLA）与柠檬酸三正丁酯（ATBC）以及美孚物质成分第 41 号（MCM-41）介孔颗粒的复合材料。为了解决这一缺陷，两个试样仅在室温下就自发形成了聚乳酸介相。这一发现是通过相应的 X 射线衍射图确定的，这些衍射图与拉伸实验所观察到的介相衍射图相似。正如 DSC 和实时变温同步辐射衍射实验所显示的那样，介相最初出现时，其再结晶成核能力明显高于无定形样品。此外，与晶体中约 16-18 纳米的长间距值相比，介相的长间距值相对较小，约为 10-11 纳米。另一方面，根据傅立叶变换红外光谱测量结果，介相在大多数情况下显示出介于无定形相和晶体相之间的有序度。它的最大特征是在 916 cm-1 处观察到一个独特的峰值，而晶体在 923 cm-1 处显示的是 α′ 相，在 921 cm-1 处显示的是 α 改性。光谱中低于 800 cm-1 左右的低频区域在文献中鲜有提及，但也被发现对有序性特别敏感。

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引用次数: 0

Intrinsic antibacterial photopolymerization 3D-printed thermosets from citronellol and cinnamyl alcohol: Synthesis and properties 香茅醇和肉桂醇的内在抗菌光聚合 3D 打印热固性塑料：合成与性能

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-09-28 DOI: 10.1016/j.polymertesting.2024.108582

Yidong Wu , Dan Hong , Shijie Qiu , Yi Fang , Yabin Zhu

As concerns about personal health continue to escalate, there is an urgent need to innovate the development and production of photopolymeric 3D printing thermoset materials with inherent antibacterial properties and high elongation, paving the way for significant advances in 3D printing technology. In this work, two acrylate compounds (CMA and CAMA)with inherent antibacterial properties were synthesized using renewable monomers derived from citronellol and cinnamyl alcohol. The chemical structures of the two acrylate compounds were verified via Fourier transform infrared spectroscopy(FT-IR) and ¹H NMR. The addition of these compounds to the photopolymeric 3D printing resin system can facilitate the production of 3D printed thermoset materials with inherent antibacterial properties. The mechanical and antibacterial properties of photopolymeric 3D printing thermosets were assessed utilizing tensile tests and oscillation methods. The results show that the addition of CMA and CAMA can significantly improve the fracture elongation and antibacterial performance of photopolymeric 3D printing thermosets. The improved systems exhibited the highest antibacterial rate (94.2 % and 98.9 %, respectively), and fracture productivities (47 % and 50 %, respectively). These results highlight the significant impact of integrating CMA and CAMA to enhance the toughness and antibacterial effects of photopolymeric 3D printing systems.

随着人们对个人健康的关注不断升级，迫切需要创新开发和生产具有固有抗菌性能和高伸长率的光聚合物 3D 打印热固性材料，为 3D 打印技术的重大进步铺平道路。本研究利用从香茅醇和肉桂醇中提取的可再生单体合成了两种具有固有抗菌性能的丙烯酸酯化合物（CMA 和 CAMA）。通过傅立叶变换红外光谱（FT-IR）和 1H NMR 验证了这两种丙烯酸酯化合物的化学结构。在光聚合三维打印树脂体系中添加这些化合物可以促进具有固有抗菌性能的三维打印热固性材料的生产。利用拉伸试验和振荡法评估了光聚合物 3D 打印热固性材料的机械性能和抗菌性能。结果表明，添加 CMA 和 CAMA 能显著提高光聚合物 3D 打印热固性材料的断裂伸长率和抗菌性能。改进后的系统表现出最高的抗菌率（分别为 94.2 % 和 98.9 %）和断裂生产率（分别为 47 % 和 50 %）。这些结果凸显了整合 CMA 和 CAMA 对提高光聚合物 3D 打印系统的韧性和抗菌效果的重大影响。

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引用次数: 0

The effect of biodegradable polymer blending on the disintegration rate of PHBV, PBS and PLA in soil 可生物降解聚合物共混物对 PHBV、PBS 和 PLA 在土壤中崩解率的影响

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-09-27 DOI: 10.1016/j.polymertesting.2024.108601

Maarten van der Zee, Martin Zijlstra, Lambertus J. Kuijpers, Marieke Hilhorst, Karin Molenveld, Wouter Post

This study generates new insights into the disintegration phenomena that take place upon blending different classes of biodegradable polymers. Polymer blending is found to be an effective method to tailor the disintegration rate of these polymers in soil. It is shown that the biodegradation of poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) can be accelerated by blending with poly(butylene succinate-co-adipate) (PBSA) and polycaprolactone (PCL). The observed high rate of disintegration of poly(butylene succinate) (PBS) in soil (severe deterioration in 4 weeks, and fragmentation in 4 months) does not fully align with its current reputation in the market as a polymer that is non-biodegradable in soil. Disintegration trials executed in soil media with different inoculants demonstrate that the biodegradation rate of PBS in soil is highly dependent on the specific soil conditions. Moreover, it is shown that the biodegradation of PBS can be substantially accelerated by blending it with PBSA (fragmentation in 8 weeks). Finally, it is shown that the disintegration of poly(lactic acid) (PLA) in soil can be enhanced by blending it with PCL. Experiments that monitor the CO₂ evolution of these blends, both in soil and in home composting environments, demonstrate that not just the disintegration, but also the overall biodegradation of PLA is enhanced by blending with PCL (39 % conversion to CO₂ in 12 months incubation in soil; 89 % conversion to CO₂ in 6 months incubation in home composting conditions). This opens up possibilities for targeted blending strategies to reduce potential accumulation of PLA-based plastics in soil environments.

这项研究对不同种类的生物可降解聚合物混合后发生的崩解现象提出了新的见解。研究发现，混合聚合物是调整这些聚合物在土壤中分解速度的有效方法。研究表明，通过与聚（丁二酸丁二醇酯-共聚己二酸丁二醇酯）（PBSA）和聚己内酯（PCL）混合，可以加速聚（羟基丁酸-共羟基戊酸）（PHBV）的生物降解。据观察，聚丁二酸丁二醇酯（PBS）在土壤中的崩解率很高（4 周内严重变质，4 个月内碎裂），这与它目前在市场上作为一种在土壤中不可生物降解的聚合物的声誉并不完全相符。在土壤介质中使用不同的接种剂进行的分解试验表明，PBS 在土壤中的生物降解率在很大程度上取决于特定的土壤条件。此外，试验还表明，将 PBS 与 PBSA 混合可大大加快 PBS 的生物降解速度（8 周后即可分解）。最后，实验还表明，聚乳酸（PLA）在土壤中的分解可以通过与 PCL 混合而得到加强。监测这些混合物在土壤和家庭堆肥环境中二氧化碳演化的实验表明，通过与 PCL 混合，不仅增强了聚乳酸的分解能力，还增强了聚乳酸的整体生物降解能力（在土壤中培养 12 个月，二氧化碳转化率为 39%；在家庭堆肥条件下培养 6 个月，二氧化碳转化率为 89%）。这为有针对性的混合策略提供了可能性，以减少聚乳酸基塑料在土壤环境中的潜在积累。

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引用次数: 0

Fatigue and wear performance of bioepoxy vacuum-infused and autoclave-cured E-glass fiber reinforced polymer composite gears in mesh with a steel pinion 真空灌注生物环氧树脂和高压固化玻璃纤维增强聚合物复合材料齿轮与钢制小齿轮啮合时的疲劳和磨损性能

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-09-26 DOI: 10.1016/j.polymertesting.2024.108600

Bor Mojškerc, Zoran Bergant, Roman Šturm, Nikola Vukašinović

Polymer composite gears are under investigation as a promising solution to mitigate the performance gap between polymer and metal gears. The study presented in this paper evaluates the fatigue and wear performance of E-glass fiber reinforced polymer composite gears. The E-glass fibers are vacuum infused with bioepoxy, followed by autoclave curing. High-speed milling is utilized to fabricate the gears, which are then subjected to testing at torques ranging from 0.5 to 0.8 Nm. Gear failure modes predominantly include wear combined with tooth edge intra-bundle fiber delamination due to fatigue, followed by extensive inter-ply delamination just prior to failure. Gear tooth wear volume demonstrates a nearly linear correlation with the number of cycles, with accelerated wear rates observed at higher torques. E-glass fiber polymer composite gears exhibit a shorter service life and a higher wear coefficient compared to our previously developed carbon fiber reinforced polymer composite gears. However, their performance remains fair, with a service life between that of PA6 GF30 and PA66 GF30 glass fiber reinforced gears.

聚合物复合齿轮作为一种有前途的解决方案，正在接受研究，以缩小聚合物齿轮与金属齿轮之间的性能差距。本文介绍的研究评估了 E 玻璃纤维增强聚合物复合齿轮的疲劳和磨损性能。E 玻璃纤维在真空中注入生物环氧树脂，然后进行高压固化。利用高速铣削制造齿轮，然后在 0.5 至 0.8 牛米的扭矩范围内进行测试。齿轮的失效模式主要包括磨损和疲劳导致的齿边束内纤维分层，以及失效前的大面积层间分层。齿轮齿磨损量与循环次数几乎呈线性关系，扭矩越大，磨损率越快。与我们之前开发的碳纤维增强聚合物复合材料齿轮相比，E 玻璃纤维聚合物复合材料齿轮的使用寿命更短，磨损系数更高。不过，它们的性能仍然不错，使用寿命介于 PA6 GF30 和 PA66 GF30 玻璃纤维增强齿轮之间。

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引用次数: 0

Energy absorption characteristics of STF impregnated Kevlar fabric coating GFRP composite structure by projectile high-velocity impact STF 浸渍凯夫拉纤维涂层 GFRP 复合材料结构在弹丸高速冲击下的能量吸收特性

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-09-25 DOI: 10.1016/j.polymertesting.2024.108596

Enling Tang, Jiameng Hou, Ruizhi Wang, Yafei Han, Chuang Chen, Mengzhou Chang, Kai Guo, Liping He

The new STF impregnated Kevlar fabric coated GFRP (glass fiber reinforced polymer) composite structure obtained by combining STF（shear thickening fluid） impregnated Kevlar fabric and GFRP can obtain strong energy absorption capacity with light weight compared with two separate structures, so it has strong impact resistance. In this paper, the experiments of STF impregnated Kevlar fabric, GFRP laminated plate and STF impregnated Kevlar fabric coating GFRP laminated structure were carried out, respectively. Based on reliable numerical simulation, the macroscopic damage and energy absorption characteristics of the same material in STF impregnated Kevlar fabric, GFRP laminated plate and STF impregnated Kevlar fabric coating GFRP laminated structure were analyzed. The results show that the GFRP laminate and the rear Kevlar fabric in the STF-impregnated Kevlar fabric coating GFRP laminate structure show a larger damage area than that of GFRP laminate and STF impregnated Kevlar fabric alone, and a larger deflection is generated during the process of impact. The increase of the number of layers of Kevlar fabric in the front and back of the laminate and the increase of the thickness of the laminate make the Kevlar fabric absorb more energy. If the energy absorption capacity of GFRP laminates is increased, the number of layers of the front Kevlar fabric can be reduced, the thickness of the laminates can be increased, and materials with greater strength can be added to the front ply of the laminates. However, increasing the thickness of GFRP laminates will reduce the lightweight requirements of laminated structures.

将 STF（剪切增稠液）浸渍凯夫拉纤维织物和玻璃纤维增强聚合物（GFRP）结合在一起而得到的新型 STF 浸渍凯夫拉纤维织物涂覆 GFRP（玻璃纤维增强聚合物）复合材料结构，与两种单独的结构相比，具有重量轻、能量吸收能力强的特点，因此具有很强的抗冲击能力。与两种单独的结构相比，STF（剪切增稠液）浸渍凯夫拉纤维和 GFRP 可获得较强的能量吸收能力，且重量轻，因此具有较强的抗冲击性。本文分别对 STF 浸渍凯夫拉纤维、GFRP 层压板和 STF 浸渍凯夫拉纤维涂覆 GFRP 层压结构进行了实验。基于可靠的数值模拟，分析了 STF 浸渍凯夫拉纤维织物、GFRP 层压板和 STF 浸渍凯夫拉纤维织物涂层 GFRP 层压结构中相同材料的宏观损伤和能量吸收特性。结果表明，STF 浸渍凯夫拉纤维涂层 GFRP 层压结构中的 GFRP 层压板和后部凯夫拉纤维比单独的 GFRP 层压板和 STF 浸渍凯夫拉纤维的损伤面积更大，在冲击过程中产生的挠度也更大。层压板前后凯夫拉纤维层数的增加和层压板厚度的增加使凯夫拉纤维吸收了更多的能量。如果要提高 GFRP 层压材料的能量吸收能力，可以减少前面凯夫拉纤维的层数，增加层压材料的厚度，并在层压材料的前层添加强度更大的材料。不过，增加玻璃纤维增强塑料层压板的厚度会降低层压结构的轻质要求。

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引用次数: 0

Consideration of molecular weight-dependent high thermal resistance of end-capped-oligoimide based thermoset resins 考虑基于末端封端的榄香酰亚胺热固性树脂的高耐热性与分子量的关系

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-09-24 DOI: 10.1016/j.polymertesting.2024.108599

Van-Kien Hoang , Kwak Jin Bae , Yuna Oh , Woohyeon Kwon , Jihyun Oh , Kyosun Ku , Minju Kim , Ki-Ho Nam , Jaesang Yu , Hyeonuk Yeo

Interest in thermosetting resins for polymer applications in extreme environments, such as aerospace, is increasing. The construction of oligoimide-based crosslinking systems has been the focus of considerable research over the past 30 years, but the analysis of chemical structure and molecular weight dependence has not been systematically performed. In this study, we established both theoretical and experimental frameworks by performing simulations based on a deep understanding of the crosslinking structure and conducted a systematic investigation of the properties of bulk specimens by synthesizing and preparing samples with various molecular weights. Theoretical investigations suggested clear differences and tendencies depending on molecular weight and crosslinking reaction pathways. Furthermore, experimental results showed excellent agreement with the simulations and clearly revealed the correlation between the molecular weights of pristine resin and thermal properties, such as glass transition and decomposition. In addition, we successfully obtained a thermosetting resin with superior thermal properties under optimized conditions, including a glass transition temperature exceeding 350 °C and a decomposition temperature exceeding 570 °C.

人们对热固性树脂在航空航天等极端环境中的聚合物应用越来越感兴趣。在过去的 30 年中，低聚亚胺基交联体系的构建一直是大量研究的焦点，但对化学结构和分子量依赖性的分析还没有系统地进行过。在本研究中，我们在深入理解交联结构的基础上，通过模拟建立了理论和实验框架，并通过合成和制备不同分子量的样品，对大块试样的性能进行了系统研究。理论研究表明，不同分子量和交联反应途径会产生明显的差异和倾向。此外，实验结果与模拟结果非常吻合，并清楚地揭示了原始树脂分子量与玻璃化转变和分解等热性能之间的相关性。此外，我们还成功获得了一种在优化条件下具有优异热性能的热固性树脂，包括玻璃化温度超过 350 ℃ 和分解温度超过 570 ℃。

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引用次数: 0

Impact of UV irradiation on high-temperature behavior of polyphenylene sulfide fiber 紫外线辐照对聚苯硫醚纤维高温特性的影响

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing

Pub Date : 2024-09-24 DOI: 10.1016/j.polymertesting.2024.108598

Wenbo Gao , Xiarui Fan , Xinwei Zhou , Peng Ren

The impact of UV radiation on the high-temperature behavior of polyphenylene sulfide (PPS) fiber was investigated in this study. The ultimate strength, failure strain elasticity modulus and toughness were employed to evaluate the degradation caused by the coupling effects of UV radiation and high temperature. The degradation characteristics of PPS fiber were observed and evaluated based on the scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The results show that both UV exposure and high temperature can effectively reduce the mechanical performance of PPS fiber. The ultimate strength, failure strain and toughness were reduced to the minimum value after UV exposure 150h at room temperature. Both the initial and second elastic modulus of PPS fiber exhibited obvious decreasing trends with the UV exposure time and temperature increasing. The micro defects and molecular structure changes were detected as the degradation characteristics of PPS fiber caused by the coupling effects of UV radiation and high temperature. The Weibull model was applied to quantitatively analyze the dispersion of strength of PPS fiber under extreme conditions.

本研究探讨了紫外线辐射对聚苯硫醚（PPS）纤维高温行为的影响。采用极限强度、破坏应变弹性模量和韧性来评估紫外线辐射和高温耦合效应引起的降解。通过扫描电子显微镜（SEM）和傅立叶变换红外光谱（FTIR）对 PPS 纤维的降解特性进行了观察和评估。结果表明，紫外线照射和高温都能有效降低 PPS 纤维的机械性能。在室温下紫外线暴露 150 小时后，极限强度、破坏应变和韧性都降低到了最低值。随着紫外线暴露时间和温度的增加，PPS 纤维的初始弹性模量和二次弹性模量都呈现出明显的下降趋势。微缺陷和分子结构变化是紫外线辐射和高温耦合效应引起的 PPS 纤维降解特征。应用 Weibull 模型定量分析了极端条件下 PPS 纤维强度的离散性。

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引用次数: 0