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题名: Phase behavior of ABC-type triple-hydrophilic block copolymers in aqueous solutions
作者: Zheng, LF ;  Wu, JQ ;  Wang, Z ;  Yin, YH ;  Jiang, R ;  Li, BH
刊名: EUROPEAN PHYSICAL JOURNAL E
出版日期: 2016
卷号: 39, 期号:7, 页码:75
学科分类: Chemistry; Materials Science; Physics; Polymer Science
DOI: http://dx.doi.org/10.1140/epje/i2016-16075-8
通讯作者: Li, BH (reprint author), Nankai Univ, Sch Phys, Minist Educ, Key Lab Funct Polymer Mat, Tianjin 300071, Peoples R China. ;  Li, BH (reprint author), Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300071, Peoples R China. ;  Li, BH (reprint author), Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China.
文章类型: Article
英文摘要: The phase behavior of symmetric ABC triple-hydrophilic triblock copolymers in concentrated aqueous solutions is investigated using a simulated annealing technique. Two typical cases, in which the hydrophilicity of the middle B-block is either stronger or weaker than that of the end A-and C-blocks, are studied. In these two cases, a variety of phase diagrams are constructed as a function of the volume fraction of the B-block and the copolymer concentration (Phi) for both non-frustrated and frustrated copolymers. Structures, such as two-color alternatingly packed cylinders or gyroid, and lamellae-in-lamellae etc. that do not occur in the melt system, are obtained in solutions. Rich phase transition sequences, especially re-entrant phase transitions involving complex continuous networks of alternating gyroid and alternating diamond are observed for a given copolymer with decreasing Phi. The difference in hydrophilicity among different blocks can result in inhomogeneous distribution of solvent molecules in the morphology, and with the decrease of Phi, the distribution of solvent molecules presents a non-monotonic variation. This results in a non-monotonic variation of the effective volume fraction of each domain with the decrease of Phi, which induces the re-entrant phase transitions. The presence of a good solvent for all the blocks can cause changes in the effective segregation strengths between different blocks and also in chain conformations, hence can alter the bulk phases and results in the occurrence of new structures and phase transitions. Especially, structures having A-C interfaces or A-C mixed domains can be obtained even in the non-frustrated copolymer systems, and structures obtained in the frustrated systems may be similar to those obtained in the non-frustrated systems. The window of the alternating gyroid structures may occupy a large part of the phase diagram for non-frustrated copolymers with stronger B-hydrophilicity. This behavior can be used to tune the self-assembled structures of block copolymers.
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary ;  Physics, Applied ;  Polymer Science
关键词[WOS]: OXIDE) TRIBLOCK COPOLYMERS ;  MONTE-CARLO-SIMULATION ;  SELECTIVE SOLVENTS ;  DIBLOCK COPOLYMERS ;  COPOLYMER/HOMOPOLYMER BLENDS ;  VARYING SELECTIVITY ;  STAR TERPOLYMERS ;  MOLECULAR-WEIGHT ;  ORDER-DISORDER ;  NETWORK PHASES
收录类别: SCI
项目资助者: National Natural Science Foundation of China [21574071, 21528401, 20990234, 20925414, 91227121] ;  PCSIRT [IRT1257] ;  111 Project
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21585
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Zheng, LF,Wu, JQ,Wang, Z,et al. Phase behavior of ABC-type triple-hydrophilic block copolymers in aqueous solutions[J]. EUROPEAN PHYSICAL JOURNAL E,2016,39(7):75.
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