摘要
以2,3,5,6-四氨基吡啶三盐酸盐一水合物(TAP·3HCl·H2O)和2,5-二羟基对苯二甲酸(DHTA)为单体,合成聚[2,5-二羟基-1,4-苯撑吡啶并二咪唑](PIPD),并采用干喷湿纺法制备了PIPD初生纤维,初生纤维在温度400℃,张力33 c N/dtex的条件下进行热处理得到PIPD纤维,研究了PIPD纤维的结构与性能。结果表明:PIPD初生纤维的线密度为959.6 tex,拉伸强度为2.15 GPa,拉伸模量为154.2 GPa;热处理后的PIPD纤维较初生纤维致密程度有所提高,线密度和拉伸强度有所下降,拉伸模量提高,热稳定性较好;纺丝原液脱泡良好、提高纺丝组件的温度均一性以及降低纤维中残酸量可进一步提高PIPD纤维的性能。
Poly [ 2,6 -diimidazo （ 4,5-b ： 4 ＇5＇-e ） pyridinylene- 1,4 （ 2,5 -dihydroxy ） phenylene （ PIPD ） was synthesized from the monomers of 2,3,5,6-tetraminopyridine monohydrate trihydrochloride （ TAP 3HC1 H2O ） and 2,5-dihydroxyterephthalic acid （DHTA） and was produced into as-spun PIPD fiber by dry-jet wet spinning process. The as-spun PIPD fiber was heat treated into PIPD fiber under the tension of 33 cN/dtex at 400 ℃. The structure and properties of PIPD fiber were studied. The results showed that the as-spun PIPD fiber had the linear density of 959.6 tex, tensile strength 2. 15 GPa and tensile modulus 154.2 GPa; as compared with as-spun PIPD fiber, the PIPD fiber after heat treatment had the higher compactness, lower linear density and tensile strength, higher tensile modulus and better thermal stability; and the fiber properties could be further improved by bettering deaeration of spinning solution, increasing the temperature homogeneity of spinning pack and decreasing the residual acid content in fiber.
出处
《合成纤维工业》
CAS
2015年第6期25-28,共4页
China Synthetic Fiber Industry
关键词
聚[2
5-二羟基-1
4-苯撑吡啶并二咪唑]纤维
直接聚合
液晶纺丝
热稳定性
力学性能
poly [ 2,6-diimidazo （ 4,5-b ：4 ＇5 ＇-e） pyridinylene-1,4 （ 2,5-dihydroxy） phenylene fiber
direct polymerization
liq- uid crystal spinning
thermal stability
mechanical properties
