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Indexed by:期刊论文

Date of Publication:2018-11-20

Journal:JOURNAL OF APPLIED POLYMER SCIENCE

Included Journals:SCIE、EI

Volume:135

Issue:44

ISSN No.:0021-8995

Key Words:flame retardance; resins; thermal properties

Abstract:To improve the liquid oxygen compatibility and cryogenic mechanical properties of epoxy resin, we synthesized and characterized a hybrid compound (functionalized boehmite) containing boehmite, phosphorus, and silicon element. The thermal properties and liquid oxygen compatibility of the composites were investigated in detail. The results show that the addition of functionalized boehmite increased the char residue obviously but had little effect on the thermal decomposition temperature and glass-transition temperature of the composites. The liquid oxygen compatibility of the composites was significantly improved. Composites with 4wt % boehmite, 0.99wt % Si, and 1.1wt % P passed the impact test. Surface element analyses before and after the drop tests suggested that the functionalized boehmite in epoxy might have prevented the impact reaction in liquid oxygen through two steps. First, the compound decomposed into phosphoric oxyacid and Al2O3 under the impact energy and captured the H center dot and center dot OH radicals produced from the decomposition of the resin. Then, the decomposition covered the surface, forming a protective layer to isolate the oxygen. The mechanism of the liquid oxygen compatibility of the epoxy composites was subsequently analyzed. In addition, the cryogenic tensile properties of the epoxy composites containing functionalized boehmite showed that the composites had potential applications under cryogenic liquid oxygen environments. (c) 2018 Wiley Periodicals, Inc.