摘要
采用X-射线衍射、声速仪和红外光谱研究了聚丙烯腈(PAN)纤维在分子热分解—环化演变初期张力的作用,结果表明:在PAN纤维氰基热分解环化初期,张力可以增加纤维中分子聚集态结构的有序化程度;有利于PAN纤维构型的转变和完善原丝原有结构,随张力的增大,PAN纤维的全取向度和结晶度也是增加的;另外,张力可以促进PAN纤维分子的热分解环化反应,尤其是分子内的环化反应,当牵伸达到4%以后可以使微晶尺寸变小,这对提高纤维强度是有利的。
The effect of a tensile force on the thermal decomposition and initial cyclization in polyacrylonitrile （PAN） has been studied by X-ray diffraction, sound velocimetry and IR spectroscopy. The results showed that in the initial stage of thermal decomposition and cyclization of the cyano groups of the PAN fiber, the tensile force can （1） , effectively enhance the degree of order in the fiber molecule, （2） has a beneficial effect on the structural transition of the PAN fiber and enhances the primary structure of the precursor such that the degree of overall orientation and crystallinity of the PAN fiber is increased by application of the tensile force and （3） can accelerate the rates of both thermal decomposition and cyclization, particularly intramolecular cyclization. When the drawing ratio exceeds 4 %, the crystallite size begins to decrease, leading to an increase in the strength of the fiber.
出处
《北京化工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第4期385-388,共4页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学基金重点项目(50333060)
关键词
聚丙烯睛
有序化
微晶尺寸
结晶度
全取向度
polyarylonitrile
order
crystallite size
crystallinity
overall orientation degree
