聚集态结构对聚丙烯腈纤维物理收缩的影响  

Effect of aggregation structure on the physical shrinkage of polyacrylonitrile fibers

作　　者：王彬[1] 赵纯[1] 张静[1] 李亚敏[1] 徐樑华[1] 

机构地区：[1]北京化工大学国家碳纤维工程技术研究中心,北京100029

出　　处：《北京化工大学学报（自然科学版）》2012年第1期48-52,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家重点基础研究项目(2011CB605602)

摘　　要：借助热机械分析仪(TMA)、X射线衍射仪(XRD)、声速仪等研究了聚集态结构对聚丙烯腈(PAN)纤维分子链物理收缩特性的影响。结果表明,由于聚集态结构影响分子链段运动性,PAN纤维分子链表现出分级收缩的特点:物理收缩首先开始于纤维非晶区,之后向晶区边界分子链扩展;非晶区分子链段收缩是物理收缩的主要部分,收缩率随非晶区取向度增加而增大;晶区边界分子链段运动受周围晶区限制,收缩较非晶区缓和,随晶区边界取向分子链增多,收缩率小幅增大;温度升高、时间延长,各段收缩率均不同程度增大。The effect of aggregation structure on the physical shrinkage of molecular chains of polyacrylonitrile fibers has been studied using thermal mechanical analysis（TMA）,wide-angle X-ray diffraction（XRD）,and acoustic velocimetry.The results showed that,since the aggregation structure affects the mobility of molecular chains,these chains shrank gradually at different stages.The physical shrinkage first started from molecular chains in the amorphous phase of PAN fibers and then extended to near the crystalline regions.The shrinkage of molecular chains in the amorphous phase was responsible for the majority of the physical shrinkage,and increased with increasing degree of orientation of the amorphous region.Molecular chains near the crystalline regions shrank more mildly than in the amorphous parts as the mobility of these chains is confined by the crystalline structure.With increasing content of orientated molecular chains near the crystalline parts,the shrinkage in these regions increased slowly.Shrinkage both in the amorphous and near the crystalline regions grew at different rates with increasing treatment temperature and time.

关 键 词：聚丙烯腈纤维 热机械分析仪 物理收缩 聚集态结构 

分 类 号：TQ342.741[化学工程—化纤工业]