| 摘要 |
Disclosed is a class of polymers comprising recurring units of the formula <IMAGE> where Mu is a divalent radical having the formula <IMAGE> where each of D, D', E and E' is hydrogen, alkyl or substituted-alkyl; and Az is a divalent radical having the formula <IMAGE> where each of R and R' is hydrogen, alkyl, aryl, alkaryl or aralkyl and W is a single bond, alkylene or alkenylene; or Az is a divalent radical having the formula <IMAGE> where each of Y and Y' represent the atoms necessary to complete a piperazine or substituted-piperazine radical. Molecularly oriented polymers of the invention exhibit birefringence and can be utilized in filter, polarizing and other optical devices.
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