Abstract
A series polyimides(PIs)were prepared by one-step method.These PIs were comprised of a functional diamine N,N-bis(4-aminophenyl)-4-(dodecylo-xy-biphenyl)-4′-amino-phenylether(C12-BAAPE),one of two commercially available diamines 2,2′-Bis(trifluoromethy-l)-4,4′-diaminobiphenyl(TFDB),4,4′-Oxydianiline(ODA)and one of two dianhydride 4,4′-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)and 4,4′-Oxydiphthalic anhydride(ODPA)in order to get different backbone structures.The structures and thermo properties of these PIs were characterized by NMR,FT-IR,DSC and TGA.Pretilt angles and alignment abilities were carried out by pretilt angle tester and polarization microscope.Solubility of PIs was tested by dissolving PIs in various organic solvents.DSC and TGA curves showed that PI-2had higher glass transition temperature(Tg)and decomposition temperature(Td)than PI-1and PI-3.Three PI films presented vertical alignment before mechanical rubbing and only PI-2maintained it after rubbing process.Conformations of these PIs were simulated by Material Studio(MS).The vertical conformation existed in PI-2's backbones improvedrubbing resistance and showed vertical alignment ability after rubbing.
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