Strategies to Stabilize the Photoinduced Supramolecular Chirality in Azobenzene Liquid Crystalline Polymers

被引：4

作者：

Royes, Jorge ^{[1
,2
]}

Oriol, Luis ^{[1
]}

Tejedor, Rosa M. ^{[1
,3
]}

Pinol, Milagros ^{[1
]}

机构：

[1] Univ Zaragoza, CSIC, Dept Quim Organ, Fac Ciencias,ICMA, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain

[2] Ecole Normale Super, Dept Chim, CNRS, UMR 8640, 24 Rue Lhomond, F-75005 Paris, France

[3] Acad Gen Militar, Ctr Univ Def, Ctra Huesca S-N, Zaragoza 50090, Spain

来源：

POLYMERS | 2019年 / 11卷 / 05期

关键词：

liquid crystallinity; light induced chirality; photoactive polymers; azobenzene; cinnamate ester; BLOCK-COPOLYMERS; FILMS; ALIGNMENT; PHOTOALIGNMENT; ANISOTROPY; MOTIONS; LENGTH;

D O I：

10.3390/polym11050885

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

This paper describes the synthesis, thermal characterization and optical properties of liquid crystalline homopolymers and block copolymers with a repeating unit consisting of two functional units, with at least one of them being an azobenzene. Films of these polymers have been irradiated with circularly polarized light at room temperature, evaluating the intensity of the photoinduced chiral signal and its temporal stability upon storage. The paper also explores two different strategies to restrict the relaxation of the photoinduced order. Firstly, block copolymers have been prepared to confine the photoaddressable segments into nanoscopic domains where relaxation should be restricted. Secondly, an alternative homopolymer has been synthesized where the repeating unit combines two chromophores that can be separately photoaddressed, an azobenzene unit to efficiently photoinduce chirality and a cinnamate to fix the chiral signal by photocrosslinking.

引用

页数：16

共 36 条

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