文献类型：期刊文献

中文题名：基于非共价键作用的二嵌段共聚物/均聚物超分子体系的自组装行为

英文题名：SELF-ASSEMBLY BEHAVIOR OF SUPRAMOLECULAR DIBLOCK COPOLYMER/HOMOPOLYMER MIXTURES WITH NON-COVALENT BONDING INTERACTIONS IN SELECTIVE SOLVENTS

作者：庄莹[1];王立权[1];林嘉平[1]

机构：[1]华东理工大学材料科学与工程学院上海市先进聚合物材料重点实验室,上海200237

年份：2011

卷号：21

期号：11

起止页码：1320

中文期刊名：高分子学报

外文期刊名：Acta Polymerica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000297825700014)】；北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金(基金号50925308)资助项目

语种：中文

中文关键词：非共价键;自洽场理论;超分子;胶束

外文关键词：Non-covalent bond; Self-consistent field theory; Supramolecule; Micelle

摘要：采用实空间求解的自洽场理论,研究了两亲性二嵌段共聚物(AB)/均聚物(C)超分子体系在溶液中的自组装行为,其中B疏水嵌段的自由末端与C均聚物的一个末端形成可逆的非共价键.在稀溶液中,AB/C超分子聚合物体系通过自组装形成了一系列不同形貌的胶束,如核-壳-冠的三层胶束和蠕虫状胶束等.研究发现,胶束形貌受到非共价键强度和初始配比的影响.随着非共价键强度的增加,超分子ABC三嵌段共聚物的含量相应地增加,而胶束形貌由三层结构向蠕虫状结构转变.此外,初始配比的改变也会引起胶束形貌的极大改变.
Self-assembly of supramolecular AB diblock copolymer/C homopolymer mixtures in selective solvents was examined by real-space self-consistent field theory.The non-covalent bond is formed between the free end of hydrophobic B block of amphiphilic AB diblock copolymer and one end of hydrophobic C homopolymer,and thereby the mixtures consist of unbonded AB diblock copolymers,unbonded C homopolymers and supramolecular ABC triblock copolymers.The constitutions of the mixtures are dependent on the non-covalent bonding strength and the initial AB/C mixing ratio,which are essential to the morphologies of the self-assembled micelles.The AB diblock copolymer/C homopolymer mixtures are self-assembled into a variety of micelles such as core-shell-corona micelles and wormlike micelles in selective solvents.With increasing the bonding strength,the volume fraction of supramolecular ABC triblock copolymers increases,and that of unbonded AB diblock copolymers and C homopolymers decreases.In this process,transitions from core-shell-corona micelles to wormlike micelles were observed.In the core-shell-corona micelles,the bonded C homopolymers are distributed at the hydrophobic/hydrophilic interface,while the unbonded C homopolymers are dispersed in solvents due to their weak hydrophobic property.In the wormlike micelles,most bonded C homopolymers localize between two cores in one micelle,while the unbonded C homopolymers transit to the center of C domains.With increasing the volume fraction of homopolymers,the volume fraction of supramolecular ABC triblock copolymers increases to a maximum and then decreases.The morphological transitions of these micelles were also observed as a function of the volume fraction of homopolymers.The work provided an insight into the effect of non-covalent bonds on the morphology of supramolecular micelles.