A novel benzoxazine/cyanate ester blend with sea-island phase structures
A novel benzoxazine/cyanate ester blend with sea-island phase structures
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DOI：
10.1039/c5cp02426a
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发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Gu, Yi
中科院分区：
文献类型：
--
作者：
Li, Xiaodan;Luo, Xiaoyong;Gu, Yi
采用反应诱导相分离法制备了一种具有海岛相结构的腰果酚基苯并恶嗪（C-BOZ）/双酚A二氰酸酯（BADCy）共混物。苯环上长链烷基的引入显著增强了C-BOZ和BADCy之间的热力学差异。随着BADCy含量的增加，共混物的Flory-Huggins相互作用参数（chi）减小。通过调节两种组分的比例，C-BOZ/BADCy共混物在固化过程中观察到海岛相分离。分散相为富C-BOZ相，基体为三嗪环和开环C-BOZ组成的交联网络。在9/1，8/2和7/3固化共混物的DMA曲线上，有两个明显的T（g）。但随着BADCy含量的增加，相分离程度减小。当比例达到5/5时，只有一个T-g，因为共混物的粘度太高而不能发生相分离。
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.