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High T-g, melt processable copolyimides based on isomeric 3,3' and 4,4'-hydroquinone diphthalic anhydride (HQDPA)
Sidra, Lala Rukh; Chen, Guofei; Mushtaq, Nafeesa; Xu, Lubo; Chen, Xiaoqi; Li, Yantao; Fang, Xingzhong
2018
发表期刊POLYMER
卷号136页码:205-214
摘要To extend the upper operating temperature range of melt processable PIs, two series of end-capped copolyimides based on hydroquinone diphthalic anhydride (HQDPA) isomers were designed by varying the contents of appropriate diamines. Thus, copolyimides PI-(0a similar to 20a) based on 3,3'-HQDPA were prepared by varying the ratio of rigid 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) and flexible 4,4'-oxydianiline (ODA). The resulting copolyimides demonstrated good properties, such as excellent solubility, high T-g ranging from 328 to 354 degrees C as determined by dynamic mechanical analyzer (DMA), besides, exhibited good thermal stability based on 5% weight loss temperature (T-5%) of 502-514 degrees C and low melt viscosity in the range of 291-935 Pa.s. Most importantly, PI-20a showed a good combination of low melt viscosity simultaneously with significantly high T-g (328 degrees C). Furthermore, this system was modified by copolymerization with different feed ratio of 4,4'-HQDPA isomer and produced another series PI-(20a similar to 20e), that exhibited high T-g in the range of 315-330 degrees C with T-5% of 502-543 degrees C and minimum complex viscosity in the range of 291-479 Pa.s. All PIs form tough and flexible films that have remarkable tensile strength and moduli in the range of 93-116 MPa and 3.7-4.7 GPa, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
关键词Structure-property Relationships High Thermooxidative Stability Poly(Ether Imide)s Polyimide Fibers Bis(Ether Anhydride)s Aromatic Polyimides Dianhydride Units Benzimidazole Derivatives
学科领域Chemistry ; Electrochemistry ; Instruments & Instrumentation
语种英语
文献类型期刊论文
条目标识符http://ir.nimte.ac.cn/handle/174433/16854
专题2018专题
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GB/T 7714
Sidra, Lala Rukh,Chen, Guofei,Mushtaq, Nafeesa,et al. High T-g, melt processable copolyimides based on isomeric 3,3' and 4,4'-hydroquinone diphthalic anhydride (HQDPA)[J]. POLYMER,2018,136:205-214.
APA Sidra, Lala Rukh.,Chen, Guofei.,Mushtaq, Nafeesa.,Xu, Lubo.,Chen, Xiaoqi.,...&Fang, Xingzhong.(2018).High T-g, melt processable copolyimides based on isomeric 3,3' and 4,4'-hydroquinone diphthalic anhydride (HQDPA).POLYMER,136,205-214.
MLA Sidra, Lala Rukh,et al."High T-g, melt processable copolyimides based on isomeric 3,3' and 4,4'-hydroquinone diphthalic anhydride (HQDPA)".POLYMER 136(2018):205-214.
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