Copolymer–homopolymer mixtures in a nanopore

doi:10.1088/1674-1056/22/9/096401

Abstract We have performed the cell dynamics simulation with the time-dependent Ginzburg-Landau theory to study the self-assembled morphology of A-B diblock copolymers and C homopolymers in a neutral nanopore. The nanopore diameter and length are systematically varied to examine their effects on the structures of various morphologies and their phase transition. From the simulation, it is observed that the equilibrium morphology of the confined system is sensitive to pore diameter D and pore length L_pore, the phase behavior in neutral nanopores is due to an interplay of two factors: the surface effect and the extension effect. When the nanopore length and the lamellae spacing are not commensurate, the surface effect prevails at small nanopores (small diameters or short lengths), the extension effect takes over at larger nanopores (large diameters or long lengths). When the nanopore length and the lamellae spacing are commensurate, the surface effect dominates. Furthermore, the interactions between different monomers are also discussed and we obtain a transition from a tilted pancakes/cylinder structure (L_⊥^tilted) to a concentric cylindrical structure with defects and to a concentric cylindrical structure (L_‖). We also investigate the effect of the relative concentrations of diblock copolymer-homopolymer and obtain a transition in which the position of the C blocks changes from the outer of the cylinder to the middle of the cylinder and then to the inner of the cylinder with the concentration of the C blocks decreasing.

Keywords: copolymer-homopolymer mixtures nanopore self-assembled morphology phase transition

Received: 18 December 2012
Revised: 05 March 2013
Accepted manuscript online:

PACS:	64.75.Va	(Phase separation and segregation in polymer blends/polymeric solutions)
	64.75.Yz	(Self-assembly)
	83.80.Uv	(Block copolymers)
	83.80.Tc	(Polymer blends)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 21031003), the Natural Science Foundation of Shanxi Province, China (Grant No. 2007011055), the Soft Science Program of Shanxi Province, China (Grant No. 2011041015-01), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20121404110004 and 20091404120002), and the Research Foundation for Excellent Talents of Shanxi Provincial Department of Human Resources and Social Security, China.

Corresponding Authors: Zhang Jin-Jun
E-mail: zhangjinjun@sxnu.edu.cn

Cite this article:

Zhang Ling-Cui (张玲翠), Sun Min-Na(孙敏娜), Pan Jun-Xing(潘俊星), Wang Bao-Feng (王宝凤), Zhang Jin-Jun (张进军), Wu Hai-Shun (武海顺) Copolymer–homopolymer mixtures in a nanopore 2013 Chin. Phys. B 22 096401

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