Phase behavior of ABC-type triple-hydrophilic block copolymers in aqueous solutions

doi:http://dx.doi.org/10.1140/epje/i2016-16075-8

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	Phase behavior of ABC-type triple-hydrophilic block copolymers in aqueous solutions
	Zheng, LF ; Wu, JQ ; Wang, Z 2; Yin, YH ; Jiang, R 2; Li, BH
刊名	EUROPEAN PHYSICAL JOURNAL E
	2016
卷号	39 期号:7 页码:75
关键词	OXIDE) TRIBLOCK COPOLYMERS MONTE-CARLO-SIMULATION SELECTIVE SOLVENTS DIBLOCK COPOLYMERS COPOLYMER/HOMOPOLYMER BLENDS VARYING SELECTIVITY STAR TERPOLYMERS MOLECULAR-WEIGHT ORDER-DISORDER NETWORK PHASES
DOI	http://dx.doi.org/10.1140/epje/i2016-16075-8
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.
学科主题	Chemistry ; Materials Science ; Physics ; Polymer Science
语种	英语
资助机构	National Natural Science Foundation of China [21574071, 21528401, 20990234, 20925414, 91227121] ; PCSIRT [IRT1257] ; 111 Project
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23250]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300071, Peoples R China 2.Nankai Univ, Sch Phys, Minist Educ, Key Lab Funct Polymer Mat, Tianjin 300071, Peoples R China 3.Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	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.
APA	Zheng, LF,Wu, JQ,Wang, Z,Yin, YH,Jiang, R,&Li, BH.(2016).Phase behavior of ABC-type triple-hydrophilic block copolymers in aqueous solutions.EUROPEAN PHYSICAL JOURNAL E,39(7),75.
MLA	Zheng, LF,et al."Phase behavior of ABC-type triple-hydrophilic block copolymers in aqueous solutions".EUROPEAN PHYSICAL JOURNAL E 39.7(2016):75.