Synthesis of Wholly Alicyclic Polyimides from N-Silylated Alicyclic Diamines and Alicyclic Dianhydrides
作者:Yasufumi Watanabe、Yoshimasa Sakai、Yuji Shibasaki、Shinji Ando、Mitsuru Ueda、Yoshiyuki Oishi、Kunio Mori
DOI:10.1021/ma011627k
日期:2002.3.1
A new synthetic method to give wholly alicyclic polyimides with high molecular weights has been developed. The polymerization of cyclobutanetetracarboxylic dianhydride (1a) or bicyclo[2.2.1]heptane-2-methanecarboxylic-3,5,6-tricarboxylic-2,3:5,6-dianhydride (1b) with various N-silylated alicyclic diamines (2) was carried out in N,N-dimethylacetamide (DMAc) at room temperature, giving poly(amic acid
已经开发出一种新的合成方法,以得到具有高分子量的全脂环族聚酰亚胺。环丁烷四羧酸二酐(1a)或双环[2.2.1]庚烷-2-甲烷羧酸-3,5,6-三羧酸-2,3:5,6-二酐(1b)与各种N-甲硅烷基化脂环族二胺(2)的聚合)在室温下在N,N-二甲基乙酰胺(DMAc)中进行,得到聚(酰胺酸三烷基甲硅烷基酯)(3)作为前体聚合物,被水解为固有粘度最高为0.99的聚(酰胺酸)(4)。升/克 两种聚酰亚胺前体均易于转化为相应的聚酰亚胺(5)通过热处理。这些聚酰亚胺在室温下易溶于极性非质子传递溶剂,例如1-甲基-2-吡咯烷酮,N,N-二甲基乙酰胺和二甲基亚砜,并显示出高的热稳定性(N 2中的T d10 = 420-445°C )和在250 nm以上的波长下具有出色的透明度。聚酰亚胺5aa的平均折射率为1.498,由该折射率推定的介电常数为2.47。