首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Role of polarization and alignment in photoactuation of nematic elastomers
Authors:C LM Harvey  E M Terentjev
Institution:(1) Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
Abstract:Changing the orientational order in liquid-crystal elastomers leads to internal stresses and changes of the sample shape. When this effect is induced by light, due to photoisomerization of constituent molecular moieties, the photomechanical actuation results. We investigate quantitatively how the intensity and the polarization of light affect photoactuation. By studying dissolved, as well as covalently bonded azo-dyes, we determine the changes in absorption and the response kinetics. For the first time we compare the response of aligned monodomain, and randomly disordered polydomain nematic elastomers, and demonstrate that both have a comparable photoresponse, strongly dependent on the polarization of light. Polarization-dependent photoactuation in polydomain elastomers gives an unambiguous proof of its mechanism since it is the only experiment that distinguishes from the associated thermal effects.
Keywords:78  20  Hp Piezo-  elasto-  and acoustooptical effects            photoacoustic effects  61  41  +e Polymers  elastomers  and plastics  82  35  Ej Nonlinear optics with polymers  83  80  Va Elastomeric polymers
本文献已被 PubMed SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号