Alternating stilbene copolymers with negative birefringence

作者：Mao Min; England Jeneffer; Turner S Richard^*

来源：Polymer, 2011, 52(20): 4498-4502.

DOI：10.1016/j.polymer.2011.08.009

• Optical film
• Birefringence
• Alternating copolymer

A new alternating copolymer of stilbene and N-(2-methylphenyl) maleimide) [I] was prepared and exhibited a strong negative birefringence in cast polymer films. The negative birefringence is proposed to result from the sterically crowded backbone which restricts the free rotation of the ortho-methyl phenyl substituent of the enchained maleimide monomer and forces the phenyl ring to exist normal to the plane of the imide ring. Alternating copolymers of styrene with I and stilbene with N-phenylmaleimide did not exhibit similar negative birefringence properties.

• 出版日期2011-9-12