微特电机用耐高温星型支化聚酰亚胺薄膜研究

Study on the high temperature resistance star-branched polyimide films for micro-motor

采用涂膜热亚胺化法，以自制的2种四胺单体-1，4-二（2，4-二氨基苯氧基）-2，5-二特丁基苯（DDAP）和1，4-二（2，4-二氨基苯氧基）-2-甲基苯（TDAP）为支化点，与二酐3，3’，4，4’-联苯四酸二酐（BPDA）、二胺4，4’-二氨基二苯醚（ODA）或对苯二胺（PDA）反应，制得了4种星型支化聚酰亚胺薄膜BPI-X，采用红外光谱和热稳定性、光学性能、力学性能、介电性能及吸水率测试等与线形聚酰亚胺薄膜的性能进行了对比。结果表明，星型支化聚酰亚胺薄膜的热稳定性、光学透明性、力学性能和介电性能比线形聚酰亚胺薄膜好，吸水率更低。

The four star-branched polyimide films BPI-X were prepared by coating thermal imidization method using self- made two kinds of tetramine monomers 1 , 4 - bis （ 2,4 - diaminophenoxy ） - 2,5 - di - tert - butylbenzene （ DDAP ） and 1 , 4 - bis （ 2,4 - diaminophenoxy ） - 2 - methylbenzene （ TDAP ） as branching points and reacting with dianhydride 3,3＇, 4,4＇- biphenyhetracarboxylic dianhydride （ BPDA ）, diamine 4,4 ＇-diaminodiphenyl ether （ ODA ） or p -phenylenediamine （ PDA ）. The properties of star-branched polyimide films were compared with those of linear polyimide films by FI＇-IR and testings of thermal stability, optical properties, mechanical properties, dielectric properties and water absorption.The results showed that the star-branched polyimide film had better thermal stability, optical transparency, mechanical properties, dielectric properties and lower water absorption than the linear polyimide film.