以对二甲苯为原料，通过溴代、偶合、硝化和还原反应成功合成了2，2’，5．5’-四甲基联苯-4，4＇-二胺（TMBPDA）．TMBPDA分别与4，4’-双酚A型二醚二酐（BPADA）和4，4’-双酚AF型二醚二酐（FBDA）通过高温-步法缩聚生成聚肫亚胺PLA和PI—AF。结果表明，两种聚酰亚胺不仅在N-甲基-2-吡咯烷酮（NMP），N，N-二甲基甲酰胺（DMAc）中展示出良好的有机可溶性，同时拥有优良热性能，由差示扫描量热仪（DSC）测得玻璃化转变温度（Tg）分别为251℃、和255℃。此外，两种聚酰亚胺薄膜在可见光范围内具有良好的透明性，在450nm处的透光率均超过了88％。
ABSTRACT : A biphenyl diamine, 2,2', 5,5'-tetramethylbiphenyl-4,4'-diamine (TMBPDA), was synthesized from p-xylene via bromination, Ni(0) catalytic coupling reaction, nitration and reduction. Polyimides (PI-A and PI-AF) were synthesized from TMBPDA with 4,4'- (4,4'-isopropylidenediphenoxy) bis - ( phthatic anhydride) (BPAI)A) arid 4,4'-(4,4'-hexafluoroisopropylidenediphenoxy) bis-( phthalic anhydride) (FBDA) respectively, by one step high temperature potycondensation. The polyimides show the good solubility in N-methyl-2-pyrrolidone (NMP), N, N- dimethylacetamide (DMAc). PI-A and PI-AF also exhibit excellent thermal stability, the glass-transition temperature (Tg) of PI-A and PI-AF measured by differential scanning calorimetry(DSC) is 251℃ and 255 V respectively. Moreover, the polyimides show the good transparency in the visible light region, the transparency at 450nm is higher than 88 % . Keywords : synthesis ; polyimide; transparency; diamine; thermal stability
参考文献
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