绝缘材料
絕緣材料
절연재료
INSULATING MATERIALS
2014年
5期
30-35
,共6页
聚脲酰亚胺%热稳定性%微相分离结构%介电性能%预倾角
聚脲酰亞胺%熱穩定性%微相分離結構%介電性能%預傾角
취뇨선아알%열은정성%미상분리결구%개전성능%예경각
polyureas-imide%thermal stability%microphase separated structure%dielectric properties%pretilt angle
以均苯四甲酸酐(PMDA)、4,4’-二氨基二苯醚(ODA)和四甲基-双（γ-氨丙基）二硅氧烷(APDS)合成了氨端基聚酰胺酸预聚体，然后分别用甲苯二异氰酸酯（TDI）和二苯甲烷二异氰酸酯（MDI）扩链制得聚脲酰胺酸，经亚胺化制备了两种聚脲酰亚胺POAU(T)和POAU(M)。通过TGA和IR研究聚脲酰亚胺的热稳定性，测试聚脲酰亚胺在频率为0.1~105 Hz和温度50~300℃的介电常数(ε)和介质损耗(tanδ)。结果表明：聚脲酰亚胺分子链段中存在两个转变温度Tg，脲基链段的Tg为244℃(POAU(T))及243℃（POAU(M)），酰亚胺环链段的Tg温度为329℃(POAU(T))及331℃(POAU(M))。预倾角测定（TBA）结果表明该聚脲酰亚胺是一种良好的液晶分子定向膜材料。
以均苯四甲痠酐(PMDA)、4,4’-二氨基二苯醚(ODA)和四甲基-雙（γ-氨丙基）二硅氧烷(APDS)閤成瞭氨耑基聚酰胺痠預聚體，然後分彆用甲苯二異氰痠酯（TDI）和二苯甲烷二異氰痠酯（MDI）擴鏈製得聚脲酰胺痠，經亞胺化製備瞭兩種聚脲酰亞胺POAU(T)和POAU(M)。通過TGA和IR研究聚脲酰亞胺的熱穩定性，測試聚脲酰亞胺在頻率為0.1~105 Hz和溫度50~300℃的介電常數(ε)和介質損耗(tanδ)。結果錶明：聚脲酰亞胺分子鏈段中存在兩箇轉變溫度Tg，脲基鏈段的Tg為244℃(POAU(T))及243℃（POAU(M)），酰亞胺環鏈段的Tg溫度為329℃(POAU(T))及331℃(POAU(M))。預傾角測定（TBA）結果錶明該聚脲酰亞胺是一種良好的液晶分子定嚮膜材料。
이균분사갑산항(PMDA)、4,4’-이안기이분미(ODA)화사갑기-쌍（γ-안병기）이규양완(APDS)합성료안단기취선알산예취체，연후분별용갑분이이청산지（TDI）화이분갑완이이청산지（MDI）확련제득취뇨선알산，경아알화제비료량충취뇨선아알POAU(T)화POAU(M)。통과TGA화IR연구취뇨선아알적열은정성，측시취뇨선아알재빈솔위0.1~105 Hz화온도50~300℃적개전상수(ε)화개질손모(tanδ)。결과표명：취뇨선아알분자련단중존재량개전변온도Tg，뇨기련단적Tg위244℃(POAU(T))급243℃（POAU(M)），선아알배련단적Tg온도위329℃(POAU(T))급331℃(POAU(M))。예경각측정（TBA）결과표명해취뇨선아알시일충량호적액정분자정향막재료。
Polyimide acid prepolymers were synthesized from pyromellitic dianhydride(PMDA), 4,4′-diami-no diphenyl ether(ODA), and tetramethyl-bis-(γ-aminopropyl) disiloxane(APDS), and the polyureas-imide acids were prepared by chain extension reaction with toluene diisocyanate(TDI) and methylene diphenyl diisocyanate(MDI) respectively, then two kinds of polyureas-imide POAU(T) and POAU(M) were prepared by imidization. The thermal stability of the polyureas-imides was studied by IR and TGA, and the dielec-tric constant and dielectric dissipation factor at 0.1~105 Hz and 50~300℃ were tested. The results show that the polyureas-imide molecule exist two glass transition temperature (Tg), and the Tg of HN-CO-NH group is 244℃(POAU(T)) and 243℃(POAU(M)), the Tg of imide ring is 329℃(POAU(T)) and 331℃(POAU(M)). The pretilt angle test result shows that the polyureas-imide is a good alignment film materi-al for liquid crystal molecules.
