A polyamic acid having a three-dimensional network molecular structure produced by a ring-opening poly-addition reaction of
(A) at least one tetracarboxylic acid dianhydride;
(B) at least one aromatic diamine; and
(C) at least one polyamino compound selected from the group consisting of compounds represented by formula (I) or (II):
n₁ is 0 or an integer from 1 to 4; n₂ is 0 or an integer from 1 to 3; X represents an acid; q represents the base number of the acid; R represents -O-, -CH₂-, -CO- or -SO₂-; and n₃ is 0 or 1; a polyimide derived from the polyamic acid; and a process for preparing a film of the polyamic acid or polyimide.
The polyimide film has superior heat resistance and mechanical characteristics.
一种具有三维网络分子结构的聚酰胺酸,由以下物质的开环加成反应生成
(A) 至少一种四
羧酸二酐;
(B) 至少一种芳香族二胺;和
(C) 至少一种聚
氨基化合物,选自由式(I)或(II)代表的化合物组成的组:
n₁ 是 0 或 1 至 4 的整数;n₂ 是 0 或 1 至 3 的整数;X 代表酸;q 代表酸的碱基数;R 代表-O-、-CH₂-、-CO- 或-SO₂-;以及 n₃ 是 0 或 1;由聚
氨基甲酸酯衍生的聚
酰亚胺;以及制备聚
氨基甲酸酯或聚
酰亚胺薄膜的工艺。
聚
酰亚胺薄膜具有优异的耐热性和机械特性。