Citation: Xue-Min Dai, Hong Gao, Ran Zhang, Zhi-Jun Du, Tong-Fei Shi, Xiang-Ling Ji, Xue-Peng Qiu, Yong-Feng Men. Preparation and Properties of High-performance Polyimide Copolymer Fibers Derived from 5-Amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole[J]. Chinese Journal of Polymer Science, ;2019, 37(5): 478-492. doi: 10.1007/s10118-019-2205-4 shu

Preparation and Properties of High-performance Polyimide Copolymer Fibers Derived from 5-Amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole

Xue-Min Dai ^1,2,3 ,
Hong Gao ⁴ ,
Ran Zhang ¹ ,
Zhi-Jun Du ² ,
Tong-Fei Shi ¹ ,
Xiang-Ling Ji ¹ ,
Xue-Peng Qiu ^2,, ,
Yong-Feng Men ^1,,

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
c.
University of Chinese Academy of Sciences, Beijing 100049, China
d.
China Academy of Space Technology, Beijing 100086, China

Corresponding author: Xue-Peng Qiu, xp_q@ciac.ac.cn Yong-Feng Men, men@ciac.ac.cn
Received Date: 14 October 2018
Revised Date: 24 November 2018
Accepted Date: 9 December 2018
Available Online: 23 January 2019

A series of polyamic acid copolymers (co-PAAs) with para-hydroxyl groups was synthesized using two diamine monomers, namely p-phenylenediamine (p-PDA) and 5-amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole (m-pHBOA), of different molar ratios through copolymerization with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) in N,N-dimethyacetamine (DMAc). The co-PAA solutions were used to fabricate fibers by dry-jet wet spinning, and thermal imidization was conducted to obtain polyimide copolymer (co-PI) fibers. The effects of the m-pHBOA moiety on molecular packing and physical properties of the prepared fibers were investigated. Fourier transform infrared (FTIR) spectroscopic results confirmed that intra/intermolecular hydrogen bonds originated from the hydroxyl group and the nitrogen atom of the benzoxazole group and/or the hydroxyl group and the oxygen atom of the carbonyl group of cyclic imide. As-prepared PI fibers displayed homogenous and smooth surface and uniform diameter. The glass transition temperatures (T_gs) of PI fibers were within 311−337 °C. The polyimide fibers showed 5% weight loss temperature (T_5%) at above 510 °C in air. Two-dimensional wide-angle X-ray diffraction (WXRD) patterns indicated that the homo-PI and co-PI fibers presented regularly arranged polymer chains along the fiber axial direction. The ordered molecular packing along the transversal direction was destroyed by introducing the m-pHBOA moiety. Moreover, the crystallinity and orientation factors increased with increasing draw ratio. Small-angle X-ray scattering (SAXS) results showed that it is beneficial to reduce defects in the fibers by increasing the draw ratio. The resultant PI fibers exhibited excellent mechanical properties with fracture strength and initial modulus of 2.48 and 89.73 GPa, respectively, when the molar ratio of p-PDA/m-pHBOA was 5/5 and the draw ratio was 3.0.
- Polyimide fiber,
- Phenylenebenzoxazole,
- Hydroxyl group,
- Hydrogen bonding
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