Synthesis of novel hyperbranched poly(ester-amide)s based on neutral α-amino acids via “AD + CBB′” couple-monomer approach
作者:You-Mei Bao、Xiao-Hui Liu、Xiu-Lan Tang、Yue-Sheng Li
DOI:10.1002/pola.24340
日期:2010.12.1
A series of novel hyperbranched poly(ester‐amide)s (HBPEAs) based on neutral α‐amino acids have been synthesized via the “AD + CBB′” couple‐monomer approach. The ABB′ intermediates were stoichiometrically formed through thio‐Michael addition reaction because of reactivity differences between functional groups. Without any purification, in situ self‐polycondensations of the intermediates at elevated
通过“ AD + CBB'”偶合单体方法合成了一系列基于中性α-氨基酸的新型超支化聚(酯酰胺)(HBPEAs)。由于官能团之间的反应性差异,通过硫代-迈克尔加成反应以化学计量方式形成了ABB'中间体。无需任何纯化,中间体在催化剂存在下于高温下进行原位自缩聚反应,可得到具有多羟基端基的HBPEA。定量13估计HBPEA的分支度(DBs)为0.40–0.58和0.24–0.54取决于聚合条件和单体结构,分别采用两种不同的计算方法进行13 C NMR。研究了催化剂,温度和中间结构对聚合过程和分子量以及所得聚合物性能的影响。FTIR,NMR和DEPT-135 NMR分析显示了所得聚合物的支链结构。HBPEA具有中等分子量,分布范围广,玻璃化转变温度在-25.5至36.5°C范围内,在氮气和空气下失重10%时的分解温度在243.4–289.1°C和231.4–265.6范围内分别为℃。其中,那些衍生