科研之友
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摘要
A novel thermosetting resin, primary amine-functional benzoxazine/epoxy copolymer (BEC), was synthesized by thermal polymerization. The structure and curing behaviors of BEC were characterized by Fourier transform infrared spectra and differential scanning calorimetry (DSC). During curing, two-step successive reactions, including addition reaction between primary amine with epoxy group and ring-opening reaction of oxazine group, occurred and led to the formation of binary crosslinking copolymer. The ring-opening reaction of oxazine ring is catalyzed by amine group and simultaneously follows autocatalytic mechanism ascribed to the generation of hydroxyl groups. The kinetic parameters of ring-opening reaction of oxazine ring were evaluated by Non-isothermal dynamic analysis using Kissinger, Ozawa, crane and Kissinger-Akahira-Sunose (KAS) methods. The value of E-a increased with the increase of curing degree, indicating an apparent diffusion control due to the lowering of molecular mobility in curing process.
- 出版日期2014-10
- 单位华南理工大学
