CAS OpenIR  > 中科院上海应用物理研究所2011-2019年
Structure and Properties of Polyimide Fibers Containing Benzimidazole and Amide Units
Yin, CQ; Dong, J; Zhang, ZX; Zhang, QH; Lin, JY
2015
Source PublicationJOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume53Issue:3Pages:183—191
Subtype期刊文献
AbstractCo-polyimide (co-PI) fibers with outstanding mechanical properties were fabricated via thermal imidization of polyamic acids, derived from a new design of combining the amide and benzimidazole diamine monomers, 4-amino-N-(4-aminophenyl)benzamide (DABA) and 2-(4-aminophenyl)-5-aminobenzimidazole (BIA), with 3,3,4,4-biphenyltetracarboxylic dianhydride (BPDA). The crystalline structure and micromorphology of the prepared co-PI fibers were investigated by synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). The two-dimensional WAXD spectra imply that the co-PI fibers possess a structure between smectic-like and three-dimensionally ordered crystalline phase, and all the obtained fibers are highly oriented along the fiber axis. SAXS patterns exhibit a pair of meridional scattering streaks for the homo-PI (BPDA/BIA) fiber, suggesting the presence of periodic lamellar structure. The incorporation of DABA into the polymer chains destroyed the lamellar structure but led to smaller size of microvoids upon increasing DABA moiety, based on SAXS analysis. The co-PI fibers, with the molar ratio of BIA/DABA being 7/3, exhibited the optimum tensile strength and modulus of 1.96 and 108.3 GPa, respectively, attributed to the well-defined ordered and dense structure. The chemical structure and molecular packing significantly affected the thermal stability of fibers, resulting in the different glass transition temperatures (T-g) from 350 to 380 degrees C. (c) 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 183-191
KeywordMultiwalled Carbon Nanotubes Regenerated Cellulose Fibers High-performance Fibers X-ray-diffraction In-situ Copolyimide Fibers 3 P-phenylenediamine 3' Small-angle 4 Deformation 4'-biphenyltetracarboxylic Dianhydride
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24583
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Yin, CQ,Dong, J,Zhang, ZX,et al. Structure and Properties of Polyimide Fibers Containing Benzimidazole and Amide Units[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2015,53(3):183—191.
APA Yin, CQ,Dong, J,Zhang, ZX,Zhang, QH,&Lin, JY.(2015).Structure and Properties of Polyimide Fibers Containing Benzimidazole and Amide Units.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,53(3),183—191.
MLA Yin, CQ,et al."Structure and Properties of Polyimide Fibers Containing Benzimidazole and Amide Units".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 53.3(2015):183—191.
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