Preparation of Poly(p-phenylene Benzobisoxazole) by High Temperature Thermal Treatment of Isopropoxy FunctionalizedAromatic Polyamides

doi:10.3969/j.issn.1000-1093.2019.09.016

Abstract

Abstract: 4,6-diamino-1,3-dihydroxy-benzene (DAR) used as monomer for the synthesis of high-performance poly (p-phenylene benzobisoxazole) (PBO) is easily oxidized and difficultly synthesized by traditional method, and the polymerization process is complicated and the spinning operation is also difficult. A novel method was developed to synthesize PBO by high temperature thermal treatment of isopropoxy functionalized aromatic polyamide, which was prepared by polycondensation of 4,6-diisopropoxy-1,3-diamine-benzene and terephthalic chloride. And the obtained PBO exhibits excellent thermal degradation temperature up to 562 ℃. The proposed method is used to avoid DAR by replacement of the more stable monomer as 4,6-diisopropoxy-1,3-diamine-benzene, greatly simplify the polymerization process for the improved solubility of monomer and polymer, and easily spin the obtained PBO precursor into nanofibers. Key

Key words: high-performancefiber, aromaticpolyimide, thermaltreatment, precursor, poly(p-phenylenebenzobisoxazole)

CLC Number:

O633.5

CHEN Fenggui， GAO Yimeng, GUI Jiaxin, L Liping. Preparation of Poly(p-phenylene Benzobisoxazole) by High Temperature Thermal Treatment of Isopropoxy FunctionalizedAromatic Polyamides[J]. Acta Armamentarii, 2019, 40(9): 1911-1917.

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第40卷第9期
2019 年9月兵工学报ACTA
ARMAMENTARIIVol.40No.9Sep. 2019