ICCAS OpenIR
Self-assembly of crystalline-coil diblock copolymer in solvents with varying selectivity: From spinodal-like aggregates to spheres, cylinders, and lamellae
Fu, J; Luan, B; Yu, X; Cong, Y; Li, J; Pan, CY; Han, YC; Yang, YM; Li, BY
2004-02-10
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume37Issue:3Pages:976-986
AbstractWe have investigated systematically the morphology of thin films spin-coated from solutions of a semicrystalline diblock copolymer, poly(L-lactic acid)-block-polystyrene (PLLA-b-PS), in solvents with varying selectivity. In neutral solvents (chloroform and tetrahydrofuran (THF)), a spinodal-like pattern was obtained and the pattern boundary was sharpened by diluting the solution. Meanwhile, loose spherical associates, together with larger aggregates composed of these associates by unimer bridges, formed partly due to crystallization of the PLLA blocks in relatively concentrated solutions. In slightly PS-selective solvent (e.g., benzene), both loose and compact spherical micelles were obtained, depending on the polymer concentration, coexisting with unimers. When enhancing the selectivity with mixed solvents, for example, mixing the neutral solvent and the slightly selective solvent with a highly PS-selective solvent, CS2, loose assemblies (nanorods in CS2/THF mixtures and polydisperse aggregates in CS2/benzene mixtures) and well-developed lamellar micelles were obtained. For the lamellar micelles observed, a collapsed corona model is proposed to describe the geometry of dry platelets spin-coated on the substrates instead of the swollen coils in solutions.
DOI10.1021/ma035447h
Indexed BySCI
Language英语
WOS IDWOS:000188803000039
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:74[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82004
Collection中国科学院化学研究所
Corresponding AuthorHan, YC
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Fu, J,Luan, B,Yu, X,et al. Self-assembly of crystalline-coil diblock copolymer in solvents with varying selectivity: From spinodal-like aggregates to spheres, cylinders, and lamellae[J]. MACROMOLECULES,2004,37(3):976-986.
APA Fu, J.,Luan, B.,Yu, X.,Cong, Y.,Li, J.,...&Li, BY.(2004).Self-assembly of crystalline-coil diblock copolymer in solvents with varying selectivity: From spinodal-like aggregates to spheres, cylinders, and lamellae.MACROMOLECULES,37(3),976-986.
MLA Fu, J,et al."Self-assembly of crystalline-coil diblock copolymer in solvents with varying selectivity: From spinodal-like aggregates to spheres, cylinders, and lamellae".MACROMOLECULES 37.3(2004):976-986.
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