聚[对-(2,5-二羟基)苯并双噁唑]纤维的合成与性能。

Synthesis and properties of poly[p-(2,5-dihydroxy)-phenylenebenzobisoxazole] fiber.

机构信息

Department of Applied Chemistry, Faculty of Science, Harbin Institute of Technology, Harbin 150001, P.R. China.

出版信息

Int J Mol Sci. 2008 Nov;9(11):2159-2168. doi: 10.3390/ijms9112159. Epub 2008 Nov 5.

DOI:10.3390/ijms9112159

PMID:19330065

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2635627/

Abstract

The novel polymer poly[p-(2,5-dihydroxy)-phenylenebenzobisoxazole] (PBOH) fiber was synthesized in the presence of 2,5-dihydroxyterephthalicacid (DHTA) and 4,6-diamino-1,3-benzenediol in poly(phosphoric acid) (PPA) using typical polycondensation conditions. The crystalline solutions of liquid PBOH in PPA were spun into fibers using dry-jet wet spinning. Furthermore, the thermostability and mechanical properties of PBOH were compared with poly(p-phenylene-2,6-benzoxazole) (PBO) in order to investigate the relationship between the chain structure and properties. The results indicated that the thermal degradation temperature of PBOH was above 750K and the tensile strength of the PBOH fiber was 3.1GPa, which were much lower than those of PBO fiber. The compressive strength of PBOH fiber was 331 M Pa, which was slightly higher than that of PBO fiber. In addition, molecular simulation was employed to explain why the compressive strength of PBOH fiber did not increase significantly compared to PBO fiber.

摘要

新型聚合物聚[p-(2,5-二羟基)亚苯基苯并双恶唑]（PBOH）纤维是在聚（磷酸）（PPA）中存在 2,5-二羟基对苯二甲酸（DHTA）和 4,6-二氨基-1,3-苯二酚的条件下通过典型的缩聚条件合成的。将液态 PBOH 在 PPA 中的结晶溶液通过干喷湿法纺丝纺成纤维。此外，为了研究链结构与性能之间的关系，将 PBOH 的热稳定性和机械性能与聚（对苯撑-2,6-苯并恶唑）（PBO）进行了比较。结果表明，PBOH 的热降解温度高于 750K，PBOH 纤维的拉伸强度为 3.1GPa，远低于 PBO 纤维。PBOH 纤维的抗压强度为 331 MPa，略高于 PBO 纤维。此外，还采用分子模拟解释了为什么 PBOH 纤维的抗压强度与 PBO 纤维相比没有显著增加。