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Preparation of High-performance Polyimide Fibers with Wholly Rigid Structures Containing Benzobisoxazole Moieties

Preparation of High-performance Polyimide Fibers with Wholly Rigid Structures Containing... In this work, a fully rigid coplanar symmetric heterocyclic unit was introduced into the rigid polyimide macromolecular backbone structure to prepare high-performance polyimide fibers. The novel co-polyimide (co-PI) fibers based on 3,3’,4,4’-biphenyltetracarboxylic anhydride (BPDA), p-phenylenediamine (PDA) and 2,6-(4,4’-diaminodiphenyl) benzo[1,2-d:5,4-d’] bisoxazole (PBOA) were fabricated via a two-step wet-spinning method. The effects of benzobisoxazole moiety on spinnability, aggregation structure, and mechanical properties of fibers were systematically discussed. The detailed structural analysis revealed that the well-defined aggregation structures of co-PI fibers were obtained from initial amorphous structure when post hot-drawing temperature was higher than 460 °C under proper drawing ratio, and the incorporation PBOA into BPDA-PDA structures produced more compact structural co-PI fiber than homo BPDA-PDA fiber. The BPDA-PDA/PBOA co-PI fibers exhibited optimum tensile strength and modulus of 2.65 and 103 GPa, which increased by 182% and 84% compared to the homo BPDA-PDA fiber, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Polymer Science Springer Journals

Preparation of High-performance Polyimide Fibers with Wholly Rigid Structures Containing Benzobisoxazole Moieties

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References (45)

Publisher
Springer Journals
Copyright
Copyright © Chinese Chemical Society Institute of Chemistry, Chinese Academy of Sciences 2022
ISSN
0256-7679
eISSN
1439-6203
DOI
10.1007/s10118-022-2666-8
Publisher site
See Article on Publisher Site

Abstract

In this work, a fully rigid coplanar symmetric heterocyclic unit was introduced into the rigid polyimide macromolecular backbone structure to prepare high-performance polyimide fibers. The novel co-polyimide (co-PI) fibers based on 3,3’,4,4’-biphenyltetracarboxylic anhydride (BPDA), p-phenylenediamine (PDA) and 2,6-(4,4’-diaminodiphenyl) benzo[1,2-d:5,4-d’] bisoxazole (PBOA) were fabricated via a two-step wet-spinning method. The effects of benzobisoxazole moiety on spinnability, aggregation structure, and mechanical properties of fibers were systematically discussed. The detailed structural analysis revealed that the well-defined aggregation structures of co-PI fibers were obtained from initial amorphous structure when post hot-drawing temperature was higher than 460 °C under proper drawing ratio, and the incorporation PBOA into BPDA-PDA structures produced more compact structural co-PI fiber than homo BPDA-PDA fiber. The BPDA-PDA/PBOA co-PI fibers exhibited optimum tensile strength and modulus of 2.65 and 103 GPa, which increased by 182% and 84% compared to the homo BPDA-PDA fiber, respectively.

Journal

Chinese Journal of Polymer ScienceSpringer Journals

Published: Mar 1, 2022

Keywords: Polyimide fiber; Benzobisoxazole; Co-polymerization; Microstructure; Mechanical properties

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