摘要
采用膨口胀大比的测量、沸水收缩率、X射线衍射、电子探针、孔隙率及机械性能的测试等分析测试手段,系统研究了凝固负牵伸对聚丙烯腈(PAN)纺丝液的膨胀效应、初生纤维聚集态结构和性能的影响,初步揭示了膨胀效应和凝固取向的产生机理及其对初生纤维结构与性能的影响。研究发现:随着凝固负牵伸的降低,PAN纺丝液的膨口胀大比减小,初生纤维的凝固取向、结晶度和晶粒尺寸均增加,其截面形状趋于规整,内部结构变得均匀致密、内部缺陷减少。
In this paper,the extrusion die-swell effect （Barus effect） of polyacrylonitrile spinning dope and the congregating structure and properties of the protofibers were systematically analyzed by means of the die-swell ratio, the boiling-water shrinkage ratio, X-ray diffraction （XRD）, electron microprobe analysis （EMPA）, porosity and mechnical properties analysis, etc. It revealed the formation mechanism of the dieswell effect and spin orientation and its influences on the structure and properties of the protofibers. The results showed that with the decrease of the jet stretch ratio, the extrusion die-swell ratio of polyacrylonitrile spinning dope became smaller, the spin orientation degree, the crystallinity degree and the crystal size all increased respectively,the cross-sectional shapes became circular and the microstruclure became compact and homogeneous. As a result, the breaking tenacity of the protofibers and resultant precursors all increased.
出处
《化工科技》
CAS
2006年第1期1-4,共4页
Science & Technology in Chemical Industry
基金
国家十五期间863项目(2002AA304130)
关键词
凝固负牵伸
膨胀效应
初生纤维
凝固取向
结构与性能
Jct strelch ratio
Die-swell effect
Protofibers
Spin orientation
Structure and properties
