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- W2067693670 abstract "Abstract: We have synthesized four kinds of polyhydroxyamides (PHAs) via low-temperature solution polymerizationof 2,2-bis(3-amino-4-hydoxyphenyl)hexafluoropropane or 3,3'-dihydroxybenzidine with isophthaloyl chloride or tere-phthaloyl chloride in N,N-dimethylacetamide and 1-methyl-2-pyrrolidone, respectively. The chemical structures of thesynthesized PHAs and the polybenzoxazoles(PBOs) obtained by heat-treatment of the PHAs were identified using FT-IR spectroscopic analysis. We studied the thermal cyclization behavior of the PHAs and related this behavior to theirchemical structures. DSC and TGA results showed that both the thermal cyclization temperatures and the thermal sta-bilities were decreased by introduction of fluorine into the main chain of the PHAs.Keywords: polybenzoxazoles, polyhydroxyamides, fluorine group, thermal cyclization temperature, thermal stability 1. 서론 최근 전자, 우주·항공과 같은 첨단산업이 발전함에 따라가볍고 강철과 같은 강도를 가지며, 금속과 달리 녹슬지 않는 고성능 섬유에 대한 요구가 증가하고 있는 추세이다. 고성능 섬유는 범용 소재의 섬유와 비교 시 인장강도, 탄성률 등의 역학적 성질과 내열성, 내화학성 등을 향상시킨 섬유를 지칭하며, 20 g/d 이상의 강도와 500 g/d 이상의 탄성률을 갖는 소재 또는 내열성, 내화학성 등이 뛰어난 소재로 정의된다[1−3]. 전방향족 폴리아미드의 한 종류인 아라미드나, 방향족 헤테로 고분자인 polybenzoxazole(PBO),polybenzothiazole(PBZT)은 전자에 해당하며 polyimide(PI)및 polybenzimidazole(PBI) 등은 후자에 해당된다고 볼 수있다[4]. 이 중 ZYLON" @default.
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- W2067693670 date "2014-10-31" @default.
- W2067693670 modified "2023-09-25" @default.
- W2067693670 title "Synthesis and Thermal Cyclization of Fluorine-Containing Polyhydroxyamides" @default.
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- W2067693670 doi "https://doi.org/10.12772/tse.2014.51.259" @default.
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