Comparative Study of Photomechanical Effects in Linear and Star Azo-Polymers

被引：4

作者：

Camorani, P. ^{[1
,2
]}

Cristofolini, L. ^{[1
,2
]}

Fontana, M. P. ^{[1
,2
]}

Angiolini, L. ^{[3
,4
]}

Giorgini, L. ^{[3
,4
]}

Paris, F. ^{[3
,4
]}

机构：

[1] Univ Parma, Dept Phys, I-43100 Parma, Italy

[2] CNR INFM CRS SOFT, Parma, Italy

[3] Univ Bologna, Dipartimento Chim Ind & Mat, I-40136 Bologna, Italy

[4] Univ Bologna, INSTM UdR Bologna, I-40136 Bologna, Italy

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2009年 / 500卷

关键词：

azobenzene; photomechanical effect; polymeric liquid crystals; star polymers; TRANSFER RADICAL POLYMERIZATION; LAYERS; FILMS;

D O I：

10.1080/15421400802713645

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

We investigated the influence of the polymer macromolecular geometry and chain length in azobenzene containing polymeric liquid crystals (azo-PLC). In particular we studied the photomechanical effects (photoinduced expansion and shrinking) on monodispersed azo-PLCs (polydispersity index 1.08-1.17) prepared from the same monomer and different molecular weights, both in linear and 3-arm star conformation. The characterization has been carried out in thin films by high resolution null ellipsometry for a simultaneous and independent determination of both mechanical and optical properties (e. g., thickness and refractive index). The measurement system has been set up in a pump probe configuration for a real time characterization of the photoinduced dynamics. The effect of coupling introduced by the polymer star configuration is discussed.

引用

页码：1 / 9

页数：9

共 19 条

[1]

ANGIOLINI L, 2007, INT J POLYM MATER, V56, P789

[2]

Synthesis by ATRP and effects of molecular weight on photomechanical properties of liquid crystalline polymers containing side-chain azobenzene chromophores [J].