Synthesis of Hyperbranched Aromatic Poly(amide−imide): Copolymerization of B‘B2 Monomer with A2 Monomer
Synthesis of Hyperbranched Aromatic Poly(amide−imide): Copolymerization of B‘B2 Monomer with A2 Monomer
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DOI：
10.1021/ma021499f
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发表时间：
2003-01
期刊：
影响因子：
5.5
通讯作者：
Yao‐Te Chang;C. Shu
中科院分区：
文献类型：
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作者：
Yao‐Te Chang;C. Shu
通过B 'B2型单体4-（3，5-二羧基苯氧基）邻苯二甲酸酐和A2型单体1，4-苯二胺的共聚反应，合成了超支化芳香族聚酰胺-酰亚胺。酸酐和氨基之间的快速反应导致形成占主导地位的酰亚胺中间体，其可以被视为一种新的AB 2型单体。在TPP/吡啶作为缩合剂的存在下，中间体未经分离进行进一步聚合，得到含有羧酸链端的超支化聚（酰胺-酰亚胺）。作为对比，单独制备了AB 2单体，并对该单体的常规自聚合进行了研究。用FTIR和1H NMR对聚合物的结构进行了表征。光谱数据表明，这两种聚合物，从两种不同的合成方法制备，具有几乎相同的结构。超支化聚（酰胺-酰亚胺）的支化度估计为60−6。
A hyperbranched aromatic poly(amide−imide) was prepared by the copolymerization of 4-(3,5-dicarboxyphenoxy)phthalic anhydride, a B‘B2 type monomer, and 1,4-phenylenediamine, an A2 type monomer. The rapid reaction between the anhydride and amino group led to the formation of the dominant imide intermediate which can be regarded as a new AB2 type of monomer. The intermediate, without isolation, was subjected to further polymerization in the presence of TPP/pyridine, as condensing agents, to give the hyperbranched poly(amide−imide), containing carboxylic acid chain ends. In comparison, the AB2 monomer was prepared separately, and the conventional self-polymerization of this monomer was also studied. The structures of the obtained polymers were characterized by FTIR and 1H NMR spectroscopy. The spectral data showed that these two polymers, prepared from two different synthetic approaches, have nearly identical structures. The degree of branching of the hyperbranched poly(amide−imide)s was estimated to be 60−6...