Synthesis and characterization of amorphous partially aliphatic polyimide copolymers based on bisphenol-A dianhydride

被引：92

作者：

Eichstadt, AE ^{[1
]}

Ward, TC ^{[1
]}

Bagwell, MD ^{[1
]}

Farr, IV ^{[1
]}

Dunson, DL ^{[1
]}

McGrath, JE ^{[1
]}

机构：

[1] Virginia Tech, Dept Chem, Blacksburg, VA 24061 USA

来源：

MACROMOLECULES | 2002年 / 35卷 / 20期

关键词：

D O I：

10.1021/ma020835p

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Partially aliphatic, high molecular weight polyimide copolymers were successfully synthesized using an ester-acid high-temperature solution imidization route by which noncrystalline, soluble materials were obtained. Variations in the aliphatic content produced a series of polyimides having different glass transition temperatures and processing characteristics. The ester-acid reaction pathway eliminated the need for anhydrous solvents and overcame the problem of salt formation commonly observed for nucleophilic, more basic, aliphatic amines prepared by the traditional poly(amic acid) synthesis route. Partially aliphatic polyimides containing either a cycloaliphatic diamine or aliphatic diamines with 6 or 12 methylene units were synthesized. Each copolymer was characterized by its molecular weight, glass transition temperature, thermal stability, coefficient of thermal expansion, refractive index, and dielectric constant. Structure-property relationships were established. The gamma and beta sub-T-g viscoelastic relaxations were explored in order to understand their molecular origins.

引用

页码：7561 / 7568

页数：8

共 40 条

[1] Coloration of aromatic polyimides and electronic properties of their source materials [J].