Effect of secondary relaxation transitions on photo-induced anisotropy in glassy azobenzene functionalized polymers

被引：5

作者：

Kharintsev, Sergey S. ^{[1
,2
]}

Shukhina, Ksenia L. ^{[1
]}

Fishman, Alexandr I. ^{[1
]}

Saikin, Semion K. ^{[3
]}

机构：

[1] Kazan Fed Univ, Inst Phys, Dept Opt & Nanophoton, Kremlevskaya 16, Kazan 420008, Russia

[2] Tatarstan Acad Sci, Inst Perspect Technol, Baumana 20, Kazan 420111, Russia

[3] Harvard Univ, Dept Chem & Chem Biol, 12 Oxford St, Cambridge, MA 02138 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2017年 / 5卷 / 27期

基金：

俄罗斯基础研究基金会;

关键词：

NONLINEAR-OPTICAL PROPERTIES; AMORPHOUS POLYMERS; AZO-POLYMERS; FIELD RAMAN; FILMS; PHOTOISOMERIZATION; ORIENTATION; TEMPERATURE; DICHROISM; MOLECULES;

D O I：

10.1039/c7tc01652b

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose a physical mechanism for the photo-induced orientation alignment of azo-dyes incorporated in polymers at temperatures far below the glass transition temperature. Using polarized FT-IR spectroscopy, we show that optical dichroism undergoes an observable change at the b-relaxation transition of the azo-polymer when the mobility of the short backbone fragments is increased. We explain this effect using temperature-dependent local strains that occur within the polymer backbones in a glassy state. These strains underlie the enhanced thermal relaxation that drives the orientation kinetics.

引用

页码：6828 / 6833

页数：6

共 42 条

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