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Indexed by:期刊论文

Date of Publication:2018-12-01

Journal:JOURNAL OF MATERIALS SCIENCE

Included Journals:SCIE、Scopus

Volume:53

Issue:24

Page Number:16303-16317

ISSN No.:0022-2461

Key Words:Bond strength (chemical); Carbon fibers; Contact angle; Dynamics; Shear strength; Silanes; Tensile strength; Wetting, 3-aminopropyltriethoxysilane; Copoly (phthalazinone ether sulfone); Dynamic contact angle; Dynamic mechanical property; Inter-laminar shear strengths; Interfacial adhesions; Interfacial property; Separation and purification, Failure (mechanical)

Abstract:In this study, we describe a novel strategy to design and construct POSS-modified silane layer on carbon fiber (CF) to strengthen the interfacial adhesion and anti-hydrothermal aging behaviors of CF-reinforced copoly(phthalazinone ether sulfone)s (PPBES). POSS was first modified by 3-aminopropyltriethoxysilane (APS) to improve chemical reactivity. Without separation and purification, APS-c-POSS was used to functionalize CF to improve reactivity and ensure the covalent linkages between CF and POSS-modified silane layer. CF coated with POSS-modified silane layer was obtained by in situ hydrolysis of APS-c-POSS. FTIR and XPS confirmed the chemical bonds between CF and POSS-modified silane layer. Dynamic contact angle, dynamic wetting test and AFM tests demonstrated that POSS-modified silane coating can increase the wettability and roughness, which could improve interlaminar shear strength and flexural strength of CF/PPBES composites by 17.5 and 30.0% with slight enhancement on tensile strength of CF. The failure mechanisms of CF/PPBES composites with and without POSS-modified silane layer were both investigated by SEM in detail. Moreover, this layer was helpful to dynamic mechanical property and hydrothermal resistance of CF/PPBES composites. This study provides alternate strategy to modify CF with POSS, which will significantly broaden the application field of POSS in advanced composites.