摘要
在电子显微镜和光学显微镜观察的基础上,对沉析法制备聚对苯二甲酰对苯二胺(PPTA)浆粕的成形机理进行探讨:PPTA/H2SO4溶液的小液滴在剪切流动场作用下被逐渐拉长,随着凝固液扩散到PPTA/H2SO4溶液液滴中,当达到一定的凝固条件时,形变就被凝固下来形成PPTA纤维,在高速搅拌作用下,发生原纤化作用而形成PPTA浆粕。
A mechanism for the formation of PPTA pulps by precipitation method is discussed based on the experimental observation. The mechanism of the process is that when the PPTA solution is introduced into a rapidly stirred coagulant, it is dispersed into small drops. These droplets are extended into long liquid threads in domains of extensional flow and solidify when sufficient coagulant has diffused across the boundary between PPTA solution and coagulant. Under high stirring speed, the solidified PPTA fibers are fibrillated into fibrils and become PPTA pulps having high specific surface area and certain mean length.
出处
《合成纤维》
CAS
北大核心
2005年第3期5-7,共3页
Synthetic Fiber in China
