Optically active: microwave-assisted synthesis and characterization of l-lysine-derived poly (amide-imide)s
作者:Ali Reza Alborzi、Saeed Zahmatkesh、Karim Zare、Javad Sadeghi
DOI:10.1007/s00726-010-0767-0
日期:2011.7
dihydrochloride. This salt was reacted with trimellitic anhydride to yield the corresponding diacid (1). Microwave-assisted polycondensation results a series of novel Poly (amide-imide)s (PAI a–i ). These polymers have inherent viscosities in the range of 0.23–0.66 dl g−1, display optical activity from +8.02 to +15.11 (as there is no obvious regioselectivity between alpha and epsilon amino groups of the chiral diacid
将1-赖氨酸盐酸盐转化为乙基1-赖氨酸二盐酸盐。该盐与偏苯三酸酐反应,得到相应的二酸(1)。微波辅助缩聚产生了一系列新型的聚(酰胺酰亚胺)(PAI a–i)。这些聚合物的固有粘度范围为0.23–0.66 dl g -1 ,显示出从+8.02到+15.11的光学活性(由于在聚合步骤中手性二酸的α和ε氨基之间没有明显的区域选择性,因此可以预测二酸部分沿聚合物主链的随机取向,并且“立构规整度”的概念”(无法在此研究中解决),并且容易溶于极性非质子溶剂。它们在362°C以上开始分解(T 10%),并显示119–153°C的玻璃化转变温度。上述所有聚合物均通过UV,FT-IR和1 H NMR光谱,元素分析,热重分析,DSC,比浓对数粘度和比旋光度进行了全面表征。