Influence of aramid fibers modified by glycidyl polyhedral silsesquioxane assisted with supercritical carbon dioxide on the properties of aramid fiber-reinforced styrene butadiene rubber composites

IF 2.9 4区化学 Q2 POLYMER SCIENCE Polymer International Pub Date : 2024-01-29 DOI:10.1002/pi.6613

Yang Li, Caiwen Shi, Xiaoli Pan, Le Yang, Chun Zhang

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Abstract

The weak interfacial adhesion of aramid fibers (AFs) in rubber composites can be improved by modifying their surface structure. Herein, modified AFs with a high grafting rate were prepared by modification using glycidyl polyhedral silsesquioxane (POSS) assisted with supercritical carbon dioxide (scCO₂). X-ray photoelectron spectroscopy confirmed the chemical bonding between AFs and glycidyl POSS. Thermogravimetric analysis and scanning electron microscopy images showed that POSS was grafted uniformly and the surface roughness enhanced obviously. After grafting the rubber with 5 wt% glycidyl POSS assisted with scCO₂, the surface grafting rate reached 12.26% and surface crystal spacing increased. The grafted layer on the modified AF surface was uniform, and the tensile strength of the modified fiber increased by 7.98%. Short AF-reinforced carbon black/styrene butadiene rubber (AF/CB/SBR = 2/50/100 phr) composites were prepared to investigate the adhesion strength between modified AFs and SBR. The reduction in tan δ of the composites confirmed the improvement in the interfacial adhesion strength. The tensile strength and modulus at 100% elongation of the composites increased by 15.13% and 25.77%, respectively, and the relative interface slip increased by 23.26%. Moreover, the cutting resistance of the composites showed a dramatic improvement, particularly for grafting with 5% glycidyl POSS assisted with scCO₂. © 2024 Society of Industrial Chemistry.

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超临界二氧化碳辅助缩水甘油聚硅氧烷改性芳纶纤维对芳纶纤维增强丁苯橡胶复合材料性能的影响

芳纶纤维（AFs）在橡胶复合材料中的界面粘附性较弱，可通过改性其表面结构来改善这一问题。本文通过使用缩水甘油基多面体硅倍半氧烷（POSS）在超临界二氧化碳（scCO2）辅助下进行改性，制备了具有高接枝率的改性芳纶纤维。X 射线光电子能谱证实了 AFs 与缩水甘油 POSS 之间的化学键。热重分析和扫描电子显微镜图像显示，POSS 接枝均匀，表面粗糙度明显提高。在 scCO2 的辅助下接枝 5 wt% 缩水甘油基 POSS 后，橡胶表面接枝率达到 12.26%，表面晶体间距增大。改性 AF 表面接枝层均匀，改性纤维的拉伸强度提高了 7.98%。制备了短 AF 增强炭黑/丁苯橡胶（AF/CB/SBR = 2/50/100 phr）复合材料，以研究改性 AF 与丁苯橡胶之间的粘附强度。复合材料 tan δ 的降低证实了界面粘附强度的提高。复合材料的拉伸强度和 100%伸长时的模量分别提高了 15.13% 和 25.77%，相对界面滑移提高了 23.26%。此外，复合材料的耐切割性也有显著提高，尤其是在使用 scCO2 辅助 5%缩水甘油 POSS 接枝时。© 2024 工业化学学会。

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来源期刊

Polymer International 化学-高分子科学

CiteScore

7.10

自引率

3.10%

发文量

135

审稿时长

4.3 months

期刊介绍： Polymer International (PI) publishes the most significant advances in macromolecular science and technology. PI especially welcomes research papers that address applications that fall within the broad headings Energy and Electronics, Biomedical Studies, and Water, Environment and Sustainability. The Journal’s editors have identified these as the major challenges facing polymer scientists worldwide. The Journal also publishes invited Review, Mini-review and Perspective papers that address these challenges and others that may be of growing or future relevance to polymer scientists and engineers.