科研之友
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摘要
A novel cardanol-based benzoxazine (C-BOZ)/bisphenol A dicyanate ester (BADCy) blend with sea-island phase structures was successfully prepared via reaction-induced phase separation. The introduction of a long-chain alkyl group on the benzene ring significantly enhanced the thermodynamic differences between C-BOZ and BADCy. With the increase of the BADCy content, the Flory-Huggins interaction parameter (chi) of the blend decreased. By adjusting the ratio of the two components, sea-island phase separations were observed in C-BOZ/BADCy blends during the curing process. The dispersed phase was a C-BOZ rich phase, while the matrix was the crosslinked network composed of triazine rings and ring-opened C-BOZ. On the DMA curves of 9/1, 8/2 and 7/3 cured blends, there were two distinct T(g)s. But with the increase of the BADCy content, the extent of phase separation was reduced. When the ratio reached 5/5, there was only one T-g because the viscosity of the blend was too high for phase separation to occur.
