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A novel DOPO-g-KH550 modification wood fibers and its effects on the properties of composite phenolic foams

Ma Y., Geng X., Zhang X., Wang C., Chu F.

Polish Journal of Chemical Technology

2018

Vol. 20, nr 2

47--53

A novel 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) graft γ-amino propyl triethoxy silane (KH550) was synthesized and introduced on the surface of wood fi ber. Finally DOPO-g-KH550 treated wood fi ber (DKTWF) was used to prepare DKTWF composite phenolic foams (DKTWFCPF). The structures of DOPO-g- KH550 was acknowledged by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (1 H-NMR). The structures of DKTWF were confirmed by FT-IR. Compared with wood fi ber, the diffraction peaks’ position was basically unchanged, but the crystallinity was slightly increased and thermal stability were dramatically improved, T5% and Tmax increased by 21.9° and 36.1° respectively. But the char yield (800°) was slightly reduced. With the dosage of DKWF, there were different degrees of improvement including the mechanical properties, flame retardancy and microstructure of DKTWFCPF. Comprehensive analysis, the interfacial compatibility was signifi cantly improved between DKTWF and phenolic resin, and the suitable content of DKTWF was 4%.