引入不对称结构对聚酰亚胺模塑料加工性能的改善

Processability Improvement of Polyimide by Adding Asymmetric Structure in Molecular Chain

采用联苯四酸二酐(BPDA)与4,4'-二胺基二苯醚(4,4'-ODA)和3,4'-二胺基二苯醚(3,4'-ODA)聚合后,经亚胺化,制备了一系列二胺不同配比的高强度易加工的聚酰亚胺模塑料。并对其流变性能、力学性能及热学性能进行测试。结果表明,随着3,4'-ODA含量的增加模塑料的冲击强度没有大的改变,而流变性能随3,4'-ODA含量的增加而提高,w(3,4'-ODA)在50%时,玻璃化转变温度为275℃,材料的冲击强度为141 kJ/m2。模压压力为20 MPa时加工性能优异。

A series of high-strength and processable polyimide （PI） moulding compounds with different content of diamine was prepared from 3,3＇, 4,4＇-biphenyl tetracarboxylic diandhydride （ BPDA ） and 4,4＇- diaminodiphenyl ether（4,4＇-ODA）, 3,4＇-diaminodiphenyl ether（3,4＇-ODA） through chemical imiidization. The rheological, mechanical and thermal resistance properties of the PI moulding compounds were investigated. With the increasing of 3,4＇-ODA content, the impact strength of the PI could be maintained without dramatic change. The rheological properties of the PI were enhanced and the glass transition temperature can reach 275 ℃. The impact strength of the PI is about 141 kJ/m2. Processability of the PI is superior at 20 MPa.