【摘要】 利用单纤维碎裂法,三点短梁法,扫描电镜(SEM)和动态力学热分析(DMTA)研究了未上浆炭纤维、环氧树脂乳液上浆炭纤维和经纳米S iO2改性环氧树脂乳液上浆炭纤维增强树脂基复合材料(CFRP)的界面性能。结果表明:炭纤维经改性乳液上浆剂和未改性乳液上浆剂上浆后,与未上浆相比,其单纤维复合材料的界面剪切强度(IFSS)分别提高了79%和41%,复合材料的层间剪切强度(ILSS)分别提高了14%和9%。DMTA图谱显示经纳米S iO2改性上浆的CFRP其损耗角正切(tanδ)较未改性上浆的降低18%,玻璃化温度(Tg)高出5℃。说明上浆剂中添加纳米S iO2可使上浆后的CFRP界面黏结性得到显著增强。更多还原

【Abstract】 A single fiber fragmentation test, three-point bend test, scanning electron microscopy and dynamic mechanical thermal analysis （DMTA） were performed to study the influence of nano-SiO₂ modified emulsion sizing on the interfacial properties of carbon fibers reinforced plastics （CFRP）. As a comparison, CFRP with and without sizing but not modified by nano-SiO₂ were also investigated. Results showed that the interfacial shear strength （IFSS） values of the CF with modified sizing and unmodified sizing were increased by 79% and 41%, respectively, compared to the CF without sizing. The interlaminar shear strength （ILSS） values of the CFRP with modified sizing and unmodified sizing were also increased by 14% and 9%, respectively compared to the CFRP without sizing. Furthermore, the loss tangent （tanδ） of CFRP with modified sizing declined to 18% and glass transition temperature （T_g） was increased by 5℃, compared to the CFRP with unmodified sizing in the DMTA chart. So the interfacial adhesion performance of the CFRP with modified sizing by nano-SiO₂ was evidently increased.更多还原