Open AccessStudy on an amine-containing benzoxazine: Homo- and copolymerization with epoxy resin
Author(s) -
Lei Zhang,
Mozhen Wang,
Jingshen Wu
Publication year - 2016
Publication title -
express polymer letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.695
H-Index - 72
ISSN - 1788-618X
DOI - 10.3144/expresspolymlett.2016.56
Subject(s) - epoxy , copolymer , materials science , amine gas treating , polymer science , polymer chemistry , composite material , organic chemistry , polymer , chemistry
An amine-containing benzoxazine (P-deta) based homopolymer and its epoxy (Ep) copolymers are investigated in this study. The structure of benzoxazine, prepared from phenol, diethylenetriamine and formalin, is confirmed by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (NMR). The viscosity of P-deta is much lower than that of commercialized benzoxazine monomers. The curing profiles of P-deta with various Ep ratios are studied by deconvolution and the related mechanism is clarified. Epoxy will not increase the curing temperature of P-deta, instead, it helps P-deta overcome the conversion limitation and promotes the curing rate. The thermal and viscoelastic properties were determined and compared. The copolymer of P-deta/Ep = 50/50 (wt/wt) shows the highest glass transition temperature, higher than both individual homopolymers and other copolymers. Increasing benzoxazine fraction enhances modulus at room temperature but deteriorates the crosslink density. It can also enhances the char yield, but deteriorates the thermal stability of the copolymers