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Synthesis and properties of novel polyimide fibers containing phosphorus groups in the main chain

机译：主链中含磷基团的新型聚酰亚胺纤维的合成与性能

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A series of polyamic acid copolymers (co-PAAs) containing phosphorous groups in the main chain were synthesized using different ratios of two diamines, i.e. , bis(3-aminophenyl)methyl phosphine oxide (DAMPO) and 4,4′-oxydianiline (ODA), with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA) by polycondensation in N , N ′-dimethyacetamide (DMAc). The co-PAA solutions were spun into fibers by a dry-jet wet spinning process, and then polyimide copolymer (co-PI) fibers were obtained by thermal imidization. ATR-FTIR spectra and elemental analysis confirmed the chemical structure of PAA and PI fibers. The as-prepared PI fibers have smooth and dense surface as well as uniform diameter. Compared with the blank PI-0, the T _(g) values of co-PI fibers increased considerably with the increase in DAMPO content. TGA results indicated that the co-PI fibers possessed good thermal stability up to 510 °C and a residual char yield of up to 61% at 850 °C. All co-PI fibers exhibited excellent elongation, and their tensile strength and modulus can reach 0.9 GPa and 14.97 GPa when the molar ratio of DAMPO/ODA was 6/4 and the draw ratio was 3.0. The relationship between microstructure and mechanical property is also discussed.
机译：使用两种二胺的不同比例合成主链中的含磷基团的一系列聚酰胺酸共聚物（Co-Paa），即双二胺，即双（3-氨基苯基）甲基氧化膦（Dampo）和4,4'- oxydianiline（ODA ），用3,3'，4,4'-联苯的四羧酸二酐（S-BPDA）通过N，N' - 二甲基乙酰胺（DMAC）中的缩聚。通过干式湿纺过程将Co-Paa溶液旋入纤维，然后通过热酰亚胺化获得聚酰亚胺共聚物（CO-PI）纤维。 ATR-FTIR光谱和元素分析证实了PAA和PI纤维的化学结构。制备的PI纤维具有光滑且致密的表面以及直径均匀。与空白PI-0相比，Co-PI纤维的T _（g）值随着Dampo含量的增加而显着增加。 TGA结果表明，Co-PI纤维具有良好的热稳定性，可达510℃，并且在850℃下的残留炭产率高达61％。所有CO-PI纤维表现出优异的伸长率，当Dampo / ODA为6/4的摩尔比和拉伸比为3.0时，它们的拉伸强度和模量可以达到0.9GPa和14.97gPa。还讨论了微观结构与机械性能之间的关系。

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