文献类型：期刊文献

英文题名：Conformational changes coupled with the isotropic-anisotropic transition Part 2. Effect of the external orientational field

作者：Lin, JP; Zhou, HJ; Zhou, DF

机构：[1]E China Univ Sci & Technol, Dept Polymer Sci & Engn, Shanghai 200237, Peoples R China

年份：2001

卷号：42

期号：2

起止页码：549

外文期刊名：POLYMER

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000089824300021)】；

语种：英文

外文关键词：external orientational field; isotropic-anisotropic transition; lattice model

摘要：Under certain conditions, polypeptide liquid crystal may exhibit an isotropic-anisotropic transition coupled with the intramolecular coil-helix changes. Based on the theoretical model that describes this phenomenon well [Lin J, et al. Polymer 2000; Lin J. Polymer 1997, 1998], the influence of external orientational held on such conformationally coupled transition was studied by introducing an energy term related to the quadrupole field. The calculations carried out show that the coupled isotropic-anisotropic and coil-helix transitions are accelerated when an external orientational field is applied. The effect of the external field intensity and molecular parameters of polypeptide has also been studied. The information obtained through the investigation may find important applications, such as envisaging new routes for processing the rigid-flexible block copolymer with better mechanical properties and constructing molecular devices for information storage and processing. (C) 2000 Elsevier Science Ltd. Ail rights reserved.