Effects of thermal histories on interfacial properties of carbon fiber/polyamide 6 composites: Thickness, modulus, adhesion and shear strength

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• 作者：Hongfu Li^a ; ^{li_hongfu@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yang Wang^b ; Chenwei Zhang^c ; Boming Zhang^a
• 关键词：A. Thermoplastic resin ; B. Interface/interphase ; D. Mechanical testing ; B. Adhesion
• 刊名：Composites Part A: Applied Science and Manufacturing
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：85
• 期：Complete
• 页码：31-39
• 全文大小：3838 K

文摘

Interface thickness and modulus of carbon fiber (CF) reinforced polyamide 6 (PA 6) composites with different thermal histories are characterized as 331–394 nm and 0.24–0.30 times to fiber modulus, respectively. Transverse fiber bundle (TFB) test is firstly employed for evaluating semi-crystalline PA 6 interfacial adhesion. TFB Failure mechanisms are schematically given. Besides enhanced molecular entangling on fiber surface, increased matrix toughness is also found to have a great effect on improved TFB results. Droplet micro-debonding results show that decreasing cooling rate and increasing annealing temperature both decrease interfacial shear strength (IFSS) though residual PA 6 on carbon fiber surface increases. In the end, the above data are normalized together with some previous measured parameters. It shows that quenching of the CF/PA 6 composites and subsequent annealing are shown to give similar results as slow cooling. Relationships between each other are also discussed.