文献类型：期刊文献

中文题名：扩链改性回收尼龙6/碳纤维复合材料的结构与性能

英文题名：Structure and Properties of Recycled Polyamide 6/Carbon Fiber Composites Modified by Chain Extension

作者：王伟[1];丁剑峰[1];夏浙安[1];李欣欣[1]

机构：[1]华东理工大学材料科学与工程学院,特种功能高分子材料及相关技术教育部重点实验室,上海200237

年份：2020

卷号：46

期号：5

起止页码：613

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

基金：中央高校基本科研业务费专项资金资助项目(222201717001)。

语种：中文

中文关键词：尼龙6;碳纤维;苯乙烯-马来酸酐共聚物;扩链;回收

外文关键词：polyamide 6;carbon fiber;styrene-maleic anhydride copolymer;chain extension;recycling

摘要：以苯乙烯-马来酸酐共聚物(SMA-700)为扩链剂,通过双螺杆挤出机制备了扩链剂改性回收尼龙6(r-PA6)/碳纤维(质量分数为10%,CF10)复合材料。通过流变性能、力学性能、断面形貌分析(SEM)、差示扫描量热分析(DSC)、X-射线多晶衍射分析(XRD)等手段对r-PA6/CF10复合材料的结构和性能进行了表征。结果表明:SMA-700对r-PA6/CF10具有显著的扩链作用,能够明显改善材料的加工性能。随着SMA-700添加量(质量分数,余同)的增加,r-PA6/CF10的熔体质量流率逐渐减小,表观黏度逐渐增大,熔体假塑性增强。当SMA-700的添加量为1%时,SMA-700的成核作用能够提高r-PA6的结晶速率和结晶度,r-PA6/CF10的拉伸强度也达到最大值(125.4 MPa);但当SMA-700过量添加时,r-PA6的结晶速率和结晶度下降,α晶型的完善程度也会降低。
A chain extender,styrene-maleic anhydride copolymer SMA-700,was mixed with recycled polyamide 6/carbon fiber composites(r-PA6/CF10)with a twin-screw extruder.The rheological properties,mechanical properties,morphology,crystalline structure,non-isothermal crystallization and subsequent melting behaviors of the resulting r-PA6/CF10 composites were investigated.The results show that SMA-700 has a remarkable chain extension effect on r-PA6/CF10 composites,and can significantly improve the processing performance of r-PA6/CF10.With the increase of mass fraction of SMA-700,the melt mass flow rate of r-PA6/CF10 decreases gradually.Meanwhile,the apparent viscosity and melt pseudo-plasticity of r-PA6/CF10 will increase with the increase of mass fraction of SMA-700.Mechanical tests show that incorporation of chain extender can simultaneously improve the tensile strength and flexural strength of r-PA6/CF10 composites.SMA-700 mass fractions of 1%and 2%maximizes the tensile strength(125.4 MPa)and flexural strength(182.3 MPa)of the r-PA6/CF10 composites,respectively.The impact strength decreases with increased mass fraction of SMA-700.Scanning electron microscopy(SEM)used suggests that there is no phase separation between SMA-700 and r-PA6 matrix,implying a good compatibility between SMA-700 and r-PA6.Non-isothermal crystallization and subsequent melting behaviors characterized by differential scanning calorimetry(DSC)show that when the mass fraction of SMA-700 is 1%,the nucleation effect of SMA-700 may increase the crystallization rate and crystallinity of the r-PA6 matrix.However,with an excessive amount of SMA-700,both the crystallization rate and crystallinity of r-PA6 drop,and the perfection degree ofαcrystal form of r-PA6 decreases simultaneously.