condenser and a nitrogen displace apparatus 12 91 g of 1 1 bis 4 4 aminophenoxy phenyl 4 phenylcyclohexane and 165 00 g of n methyl 2 pyrrolidone were charged and the mixture was dissolved with stirring then the mixture was cooled to 10 u00b0 c 6 11 g of pyromellitic dianhydride was added and the mixture was reacted with stirring after one hour 1 35 g of paraaminophenyltrimethoxysilane was added and the mixture was reacted with stirring at 15 u00b0 c then the reaction solution was diluted with 18 33 g of butyl cellosolve to obtain a solution of polyamic acid 10 by weight u03b7 20 120 cps after the solution was diluted with twice by volume of n methyl 2 pyrrolidone and twice by volume of butyl cellosolve the solution was applied by a rotation coating method a spinner method on glass substrates equipped with transparent electrodes at the one side the coating conditions were 2000 rpm and 20 seconds after coating the substrates were preheated at 10 u00b0 c for 10 minutes and heated at 200 u00b0 c for one hour to obtain polyimide films having film thickness of 60 nm on the substrates then the film surface of two pieces of the substrates was rubbed respectively a liquid crystal cell having thickness of about 20 u03bcm was assembled.