Photochromism of comb-like polysiloxane polymers containing azobenzene side groups

Abstract

This paper describes the photochromism and thermal back-isomerization of 4-undecylen-[10]-amidoazobenzene and its homo-and copolysiloxanes in solution and solid film. The composition ratio of cis/tran isomers tends to be constant in with irradiation time. The photostationary state composition is only related to irradiation were length. The photoisomerization reaction is reversible. The copolysiloxane PSII3A [the raio of fed monomers (M1/M2)=1/9, M1 is 4-undecylen-[10]-amidoazobenzene, M2 is methyl 4-undecylenoyllbenzoate] is the best in regard to photoisomerization reaction rate and photoisomerization conversion percentage. The thermal back-isomerization can be enhanced when temperature is elevated.

Key words: POLYSILOXANE, PHOTOCHROMISM, COMB POLYMER

CLC Number:

O631.2

Cite this article

ZHANG JINGZHI;ZHANG QIZHEN. Photochromism of comb-like polysiloxane polymers containing azobenzene side groups[J]. Acta Chimica Sinica, 1997, 55(9): 930-936.

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侧基含偶氮基的硅氧烷梳状聚合物的光致变色性