【摘要】 合成了两种以3,3’,4,4’-二苯醚四羧酸二酐(ODPA)、己二胺(DAH)、4,4’-二苯醚二胺(ODA)为原料的半芳香族聚酰亚胺。ODPA∶DAH∶ODA的摩尔配比从4∶3∶1(PI1)到6∶5∶1(PI2)变化。PI1和PI2的玻璃化转变温度分别为143℃和141℃。PI2薄膜在DSC观察到结晶熔融温度为212℃,熔融焓为10.28J/g,偏光显微镜照片(POM)中,呈现了球晶特征的Maltese十字消光和清晰的微纤结构,WAXD图上,在13°、18°、24°附近出现了明显的结晶峰,表明PI2薄膜为半结晶性聚酰亚胺。与此相对应,PI1薄膜为无定形结构。在258.3℃时,PI1和PI2在10kg负荷下熔体指数分别为0.32和0.98g/10min,表明PI1和PI2均能熔融加工。PI1和PI2薄膜具有较好的物理机械性能,拉伸强度分别为95.1MPa和81.8MPa,拉伸模量分别为2.0GPa和1.8GPa。更多还原

【Abstract】 Two semi-aromatic polyimides were prepared from 4,4’-oxydiphthalic anhydride (ODPA), 1,6-hexamethylenediamine (DAH) and 4,4’-oxydianiline(ODA).For PI1 films and PI2 films,the molar ratios of ODPA∶DAH∶ODA were 4∶3∶1 and 6∶5∶1, respectively.The DSC results showed that the glass transition temperatures of PI1 and PI2 are 143?℃ and 141?℃, respectively,and the crystal melting temperature and enthalpy of melting of PI2 is 212?℃ and 10.28?J/g. Under polarized optical microscope PI2 showes spherulites typical Maltese cross and clear fibril pattern. WAXD measurement of PI2 indicated that sharp reflection peaks are detected at 13°、18°、24°. DSC、POM and WAXD results showed that PI2 films aggregation structure is semi-crystallinity,and PI1 aggregation structure is amorphous. By MI test at 258.3?℃ with 10?kg load, melt indexs of PI1 and PI2 are 0.32?g/10?min and 0.98?g/10?min,respectively. For PI1 films and PI2 films , tensile strength are 95.1?MPa and 81.8?MPa ,tensile modulus are 2.0?GPa and 1.8?GPa,respectively.更多还原