One-pot synthesis of an alternating copolyimide based on regioselective reaction of a non-symmetrical alicyclic dianhydride
One-pot synthesis of an alternating copolyimide based on regioselective reaction of a non-symmetrical alicyclic dianhydride
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DOI：
10.1002/marc.200600319
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发表时间：
2006-09
影响因子：
4.6
通讯作者：
K. Kudo;T. Yoshizawa;T. Hamada;Jun Li;S. Sakamoto;S. Shiraishi
中科院分区：
文献类型：
--
作者：
K. Kudo;T. Yoshizawa;T. Hamada;Jun Li;S. Sakamoto;S. Shiraishi
由1个非对称脂环四酸二酸酐(摩尔当量为1 0)和2个对称芳香族二胺(各为0 5摩尔当量)的相同组合，仅改变反应步骤，成功地合成了4个结构上同分异构体(酰胺酸)S(CoPAA)，其中2个交替合成，2个随机合成。当反应混合物在化学亚胺化条件下不分离CoPAA时，一锅即可得到相应的共聚酰亚胺(COPI)。所有的CoP都是微黄色的无定形粉末，它们的溶解度都是相似的。交变CoP的玻璃化转变温度低于无规CoP的玻璃化温度。
Four constitutionally isomeric copoly(amide acid)s (coPAAs), two alternating and two random, have been successfully obtained from the same combination of one non-symmetrical alicyclic tetracarboxylic dianhydride (1.0 molar equivalents) and two symmetric aromatic diamines (0.5 molar equivalents each) by only slightly changing the reaction procedures. When the reaction mixture is subjected to chemical imidization conditions without isolation of coPAAs, the corresponding copolyimides (coPIs) are obtained in one pot. All of the coPIs are slightly yellow amorphous powders and the solubility of them is similar to each other. The glass transition temperatures of the alternating coPIs are lower in comparison to those of the random coPIs.