Synthesis, cure kinetics, and physical properties of a new tricyanate ester with enhanced molecular flexibility
作者:Andrew J. Guenthner、Matthew C. Davis、Kevin R. Lamison、Gregory R. Yandek、Lee R. Cambrea、Thomas J. Groshens、Lawrence C. Baldwin、Joseph M. Mabry
DOI:10.1016/j.polymer.2011.07.024
日期:2011.8
1,2,3-Tris(4-cyanatophenyl)propane, a new tricyanate ester monomer that was designed to incorporate more flexible chemical linkages at junction points in the cured macromolecular network, was synthesized in nine steps with an overall yield of 26%. The highly purified monomer exhibited an activation energy of 110 kJ/mol for auto-catalytic cure at temperatures of 210 °C–290 °C, modestly lower than the
1,2,3-Tris(4-cyanatophenyl)propane是一种新的三氰酸酯单体,设计用于在固化的大分子网络的连接点处引入更灵活的化学键,分9步合成,总收率为26%。在210°C–290°C的温度下,高度纯化的单体在自动催化固化中的活化能为110 kJ / mol,略低于商业上氰化的线型酚醛清漆的活化能。对于这些新单体,在这些温度下可达到的总固化程度也更高。固化后的单体的许多物理性质,包括密度,热化学稳定性,水分吸收以及水解降解对玻璃化转变温度的影响,都与市售三氰酸酯相似,完全转化时的干玻璃化转变温度至少为340°C。这些结果说明了如何仔细控制网络结点附近的局部化学结构,以改善热固性聚合物网络的性能。