摘要
采用X射线衍射、声速法研究了成纤过程中PAN纤维晶态结构和取向态结构的变化规律。结合扫描电镜观察纤维的截面形态,研究成纤过程中PAN纤维聚集态结构的形成过程。结果表明,在成纤过程中,纤维晶态结构主要形成于凝固成型阶段,可以用两相模型(“准晶”区和无定型区)来描述;而取向态结构主要受两段牵伸控制,其中前牵伸对晶态结构的完善起到相当关键的作用,再牵伸则主要提高纤维的取向度;干燥致密化过程有利于晶区的生长和完善,同时固定了纤维的取向态结构。
Changes to the crystalline state and orientation texture of PAN fibers during coagulation, wet-draw- ing, hot-drawing and the drying densification stage were studied by XRD, SEM and acoustic velocity measurements, from which the evolution of PAN aggregate state in the fiber formation process was derived. Results showed that the crystalline state of PAN, which could be described as two-phase with distinct pseudocrystalline （ordered） and amorphous （disordered） phases, was largely produced during the coagulation stage, and the orientation texture was mainly controlled by wet-drawing and hot-drawing. The former plays an important role in the crystalline perfection, while the effect of the latter is to improve the degree of orientation. The drying densification process favors the growth of pseudocrystalline regions while consolidating the orientation texture.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2006年第1期54-58,共5页
New Carbon Materials
基金
国家自然科学基金(50333060)~~
关键词
PAN纤维
晶态
取向态
X射线衍射
Polyacrylonitrile（PAN） fibers
Crystalline state
Orientation texture
X-my diffraction
