文献类型：期刊文献

中文题名：Morphologies of diblock copolymer confined in a slit with patterned surfaces studied by dissipative particle dynamics

作者：FENG Jian[1,2];HUANG Yongmin[1];LIU Honglai[1];HU Ying[1]

机构：[1]Lab for Advanced Material and Department of Chemistry,East China University of Science and Technology,Shanghai 200237,China;[2]Department of Chemistry,Chuzhou University,Chuzhou 239012,China

年份：2007

卷号：1

期号：2

起止页码：132

中文期刊名：Frontiers of Chemical Science and Engineering

外文期刊名：化学科学与工程前沿（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2011_2012】；PubMed;

基金：supported by the National Natural Science Foundation of China(Grant No.20490200);E-institute of Shanghai High Institution Grid(Grand No.200303).

语种：英文

中文关键词：diblock copolymer;restricted system;dissipa-tive particle dynamics;polydispersity of diblock copolymer

摘要：Diblock copolymers with ordered mesophase structures have been used as templates for nano-fabrication.Unfortunately,the ordered structure only exists at micrometer-scale areas,which precludes its use in many advanced applications.To overcome this disadvantage,the diblock copolymer confined in a restricted system with a patterned surface is proved to be an effective means to prohibit the formation of defects and obtain perfect ordered domains.In this work,the morphologies of a thin film of diblock copo-lymer confined between patterned and neutral surfaces were studied by dissipative particle dynamics.It is shown that the morphology of the symmetric diblock copolymer is affected by the ratio of the pattern period on the surface to the lamellar period of the symmetric diblock copolymer and by the repul-sion parameters between blocks and wall particles.To elimi-nate the defects in the lamellar phase,the pattern period on the surface must match the lamellar period.The difference in the interface energy of different compartments of the pattern should increase with increasing film thickness.The pattern period on the surface has a scaling relationship with the chain length,which is the same as that between the lamellar period and the chain length.The lamellar period is also affected by the polydispersity of the symmetric diblock copolymer.The total period is the average of the period of each component multiplied by the weight of its volume ratio.The morpholo-gies of asymmetric diblock copolymers are also affected by the pattern on the surface,especially when the matching period of the asymmetric diblock copolymer is equal to the pattern period,which is approximately equal to the lamellar period of a symmetric diblock copolymer with the same chain length.