2011
DOI: 10.1177/0954008311401929
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Preparation and characterization of ternary copolyimide fibers via partly imidized method

Abstract: A series of copolyamic acid (PAA) were synthesized from various ratios of two diamines p-phenylene diamine and 4,4′-oxydianiline (ODA) via copolymerization with pyromellitic dianhydride (PMDA) in polar solvent dimethylacetamide. A mixture of acetic anhydride and triethylamine was used as the cyclizing agent and added to the PAA in order to chemically convert it into partly imidized PAA, which then was spun into fibers by dry-jet wet-spinning. Finally, polyimide (PI) fibers were prepared after the as-spun fiber… Show more

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Cited by 12 publications
(4 citation statements)
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“…V. M. et al [ 26 ] discussed the correlation between the high-temperature local mobility and the mechanical properties; they believed that the modulus and the rigidity of the molecular chain are related. However, compared with the 3,3′,4,4′-biphenyldianhydride (BPDA)/4,4′-ODA system with a flexible chain, the PMDA/4,4′-ODA system with a rigid chain exhibits weaker mechanical properties [ 27 , 28 , 29 ]. There is still a lack of further mechanism analysis of the effect of chemical structure on mechanical properties.…”
Section: Introductionmentioning
confidence: 99%
“…V. M. et al [ 26 ] discussed the correlation between the high-temperature local mobility and the mechanical properties; they believed that the modulus and the rigidity of the molecular chain are related. However, compared with the 3,3′,4,4′-biphenyldianhydride (BPDA)/4,4′-ODA system with a flexible chain, the PMDA/4,4′-ODA system with a rigid chain exhibits weaker mechanical properties [ 27 , 28 , 29 ]. There is still a lack of further mechanism analysis of the effect of chemical structure on mechanical properties.…”
Section: Introductionmentioning
confidence: 99%
“…In order to meet the increasing needs and applications, diverse copolyimides have been synthesized. [9][10][11] Specifically, P-84 and PI-2080, 12,13 developed by Austrian HP Polymer GmbH and American Upjohn, respectively, have been commercialized successfully. Figure 1 shows a potential chemical structure of P-84.…”
Section: Introductionmentioning
confidence: 99%
“…Wet-spinning or dry-jet wet-spinning process is usually adopted to prepare PI fibers, 18 in which the diffusion process between solvent and the nonsolvent may produce the microvoids in the fibers and sacrifice the mechanical properties. 19 Alternatively, dry-spinning process has just been applied on the preparation of PI fibers with the two-step process. 20,21 In our previous work, a novel PI fiber has been successfully fabricated via a two-step dry-spinning process based on pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA), and the obtained fiber exhibited dense and homogenous microstructure and excellent mechanical properties.…”
Section: Introductionmentioning
confidence: 99%