PAN/DMSO溶液等温结晶行为的研究  

Isothermal crystallization behavior of PAN/DMSO solution

作　　者：李龙[1] 焦娜[1] 陈旺[1] 徐樑华[1] 曹维宇[1] 

机构地区：[1]北京化工大学有机无机复合材料国家重点实验室碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《合成纤维工业》2013年第5期16-18,共3页China Synthetic Fiber Industry

基　　金：国家973计划项目(211CB605603)

摘　　要：利用广角X射线衍射(WAXD)的方法研究了聚丙烯腈/二甲基亚砜(PAN/DMSO)溶液的等温结晶行为。结果表明:溶液中PAN分子链以无规线团的形态存在;一定结晶温度下,PAN的结晶度随着时间的延长而增大,且前期结晶成核速率大于中后期晶粒生长速率;提高结晶温度,PAN结晶速率增加,结晶更为完善,结晶完成后,结晶度可达80.5%;PAN/DMSO溶液的等温结晶过程分为4个阶段,即无定形态、短程有序的螺旋构象、长程有序结构及完善的晶态结构。The isothermal crystallization behavior of polyacrylonitrile/dimethyl sulfoxide （PAN/DMSO） solution was studied by wide angle X-ray diffraction analysis （WAXD）.The results showed that the molecular chain of PAN in the solution existed in random coil state; the crystallinity of PAN increased while prolonging the time at a specific crystallization temperature and the crystalline nucleation rate at the early stage was higher than the crystal growth rate at the medium and later stages of crystallization; the crystallization rate of PAN increased and the crystalline structure became more perfect while raising the crystallization temperature,and the crystallinity could be 80.5% as the crystallization finished.The isothermal crystallization of PAN/DMSO solution could be divided into four stages,namely,amorphous structure,short-range ordered helical conformation,long-range ordered structure and perfect crystalline structure.

关 键 词：聚丙烯腈纤维 等温结晶 结晶模型 广角X射线衍射 结晶度 

分 类 号：TQ342.31[化学工程—化纤工业]