有哪些信誉好的足球投注网站synthesis and properties of poly[p-(2,5-dihydroxy)- phenylenebenzobisoxazole] fiber合成和性能的聚(p -(2,5-dihydroxy)u2014u2014phenylenebenzobisoxazole)纤维.pdfVIP
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Int. J. Mol. Sci. 2008, 9, 2159-2168; DOI: 10.3390/ijms9112159 OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 /journal/ijms/ Article Synthesis and Properties of Poly[p -(2,5-dihydroxy)- phenylenebenzobisoxazole] Fiber Hong Lin, Yu-Dong Huang * and Feng Wang Department of Applied Chemistry, Faculty of Science, Harbin Institute of Technology, Harbin 150001, P.R. China. E-Mail: lin-hong2001@163.com * Author to whom correspondence should be addressed; E-Mail: ydhuang.hit1@; Tel. +86-451-864-148-06; Fax: +86-451-864-137-11 Received: 13 July 2008; in revised form: 27 October 2008 / Accepted: 29 October 2008 / Published: 5 November 2008 Abstract: The novel polymer poly[p -(2,5-dihydroxy)-phenylenebenzobisoxazole] (PBOH) fiber was synthesized in the presence of 2,5-dihydroxyterephthalicacid (DHTA) and 4,6-diamino-1,3-benzenediol in poly(phosphoric acid) (PPA) using typical polycondensation conditions. The crystalline solutions of liquid PBOH in PPA were spun into fibers using dry-jet wet spinning. Furthermore, the thermostability and mechanical properties of PBOH were compared with poly(p -phenylene-2,6-benzoxazole) (PBO) in order to investigate the relationship between the chain structure and properties. The results indicated that the thermal degradation temperature of PBOH was above 750K and the tensile strength of the PBOH fiber was 3.1GPa, which were much
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