N位取代聚苯并咪唑酰亚胺薄膜: 改善的溶解性与透过率

N-substituted Poly(benzimidazole-imide)Films:Improved Solubility and Transmittance

试验合成了两种新型的N-苯基取代苯并咪唑二胺,区别在于N-苯基的邻位分别由甲基和氟原子取代。将新型二胺分别与二酐4,4′-(六氟异丙烯)二酞酸酐(6FDA)和4,4′-氧双邻苯二甲酸酐(ODPA)通过两步热亚胺法制备聚苯并咪唑酰亚胺(PBII)薄膜,并对新型二胺单体及PBII薄膜进行了性能测试与表征。结果表明:新型PBII薄膜表现出良好的耐热性(玻璃化转变温度T_(g)=341~381℃)和拉伸强度(σ=95~135 MPa)。不同邻位取代的N-苯基破坏了分子的有效堆积,使得PBII薄膜的溶解性和光学透明性得到改善。

Two novel diamines contained N-phenyl substituted benzimidazole were synthesized,and their difference was that the ortho-position of N-phenyl was substituted by methyl and fluorine atom,respectively.The novel diamines and commercially available dianhydrides 4,4′-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)and 4,4′-oxydiphthalic anhydride(ODPA)were used to prepare poly(benzimidazole-imide)(PBII)films by two-step thermal imidization.The properties of new diamine monomer and PBII films were tested and characterized.The results show that the PBII films exhibit good thermal properties(glass transition temperature T_(g)=341−381℃)and mechanical properties(σ=95−135 MPa).The N-phenyl groups with different ortho units destroy the effective molecular packing,which improves the solubility and optical transmittance of the PBII films.