Implementation of <i>meta</i>-Positioning in Tetrafunctional Benzoxazines: Synthesis, Properties, and Differences in the Polymerized Structure
作者:Sini Nalakathu Kolanadiyil、Masaki Minami、Takeshi Endo
DOI:10.1021/acs.macromol.0c00947
日期:2020.8.25
of oxazine ring within the molecule itself, and formed four-membered AZA cyclic rings along with phenolic Mannich bridges in the networked structure, whereas in m-N,N-type positioning, polymerization proceeded intermolecularly and resulted in traditional phenolic Mannich bridges. Solid-state 13C NMR analysis of poly(mBZ4)s obtained at 200 and 250 °C revealed the presence of AZA cyclic rings in the cured
的执行元在中间四官能苯并恶嗪代替-positioning对-positioning在试图开环聚合过程中,以获得/前低的固化和体重无损失的苯并恶嗪的单体来完成。通过串联反应方法,使用在间位具有氨基甲基苯酚骨架的起始酚/胺,芳香族二胺(如4,4'-二氨基二苯甲烷(DDM )),通过串联反应方法合成了三种不同的间位四官能苯并恶嗪单体(m BZ4s)-D)和米-亚苯基二胺(米PDA)或双酚,如4,4'-二羟基二苯基甲烷(DDM-B),和多聚甲醛。全部mBZ4显示出较低的固化温度(m BZ4- m PDA(209°C)< m BZ4-DDM-D(219°C)< m BZ4-DDM-B(226°C)),在ROP之前/期间没有失重所得聚苯并恶嗪具有良好的热稳定性(重量损失10%(T d10)时的初始降解温度376–411°C; 600°C时的炭收率61–66%)。这些单体之间的主要结构差异是原子存在于元