The influence of polyhedral oligomeric silsesquioxanes–polyvinylpyrrolidone on the interlaminar fracture toughness of carbon fiber-reinforced composites (CFRPs) is investigated in this study. Baseline composite material is fabricated using novolac epoxy-infused carbon fiber prepreg. Glycidyl isobutyl polyhedral oligomeric silsesquioxanes (GI) is introduced in the CFRP at loading of 1, 3, 5, and 10 wt.% with respect to polyvinylpyrrolidone used as a compatibilizer. Results of the double cantilever beam test indicate an increase of 70% in interlaminar fracture toughness for 5 wt.% GI-POSS loading compared to the baseline composite. Scanning electron microscopy shows polyhedral oligomeric silsesquioxanes enhanced the adhesion between fiber and the resin that leads to the fiber pull-out. Dynamic mechanical analysis result captures the reduction in the storage modulus with addition of polyvinylpyrrolidone due to the plasticization effect. Nonetheless, the introduction of polyhedral oligomeric silsesquioxanes increases the storage modulus for the GI/PVP composite. Additionally, an increase in the glass transition temperature with the reinforcement of polyhedral oligomeric silsesquioxanes is observed.

中文翻译：

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使用多面体低聚倍半硅氧烷改善碳纤维/环氧树脂复合材料的断裂韧性和热机械性能

本研究研究了多面体低聚倍半硅氧烷-聚乙烯吡咯烷酮对碳纤维增强复合材料 (CFRP) 层间断裂韧性的影响。使用酚醛环氧树脂灌注碳纤维预浸料制造基线复合材料。缩水甘油异丁基多面体低聚倍半硅氧烷 (GI) 以相对于用作增容剂的聚乙烯吡咯烷酮的 1、3、5 和 10 重量％的负载量引入 CFRP。双悬臂梁测试的结果表明，与基线复合材料相比，5 wt.% GI-POSS 负载的层间断裂韧性增加了 70%。扫描电子显微镜显示多面体低聚倍半硅氧烷增强了纤维与树脂之间的粘附力，从而导致纤维拉出。动态力学分析结果显示了由于塑化作用，加入聚乙烯吡咯烷酮后储能模量的降低。尽管如此，多面体低聚倍半硅氧烷的引入增加了 GI/PVP 复合材料的储能模量。此外，观察到玻璃化转变温度随着多面体低聚倍半硅氧烷的增强而增加。