ICCAS OpenIR
Dendritic Superstructures and Structure Transitions of Asymmetric Poly(L-lactide-b-ethylene oxide) Diblock Copolymer Thin films
Huang, Shaoyong2; Jiang, Shichun1; Chen, Xuesi2; An, Lijia2
2009-11-17
Source PublicationLANGMUIR
ISSN0743-7463
Volume25Issue:22Pages:13125-13132
AbstractThe evolution of morphologies of isothermally crystallized thin films with different thicknesses of poly(L-lactide-bethylene oxide) diblock copolymer was observed by optical microscopy (OM) and atomic force microscopy (AFM). Dendritic superstructures stacked with lamellae were investigated in thin films with similar to 200 nm to similar to 400 nm thickness. The lamellar structure was a lozenge- or truncated-lozenge-shaped single crystal of PLLA confirmed by AFM observations. The contour of the dendritic superstructures is hexagonal, and two types of sectors, [110] and [100], can be classified in terms of the chain-folding and crystal growth directions. These phenomena Are due to the interplay of the crystallization of the PLLA block, the microphase separation of the block copolymer, and the effect of the film thickness. The growth process of the superstructure can be classified into three steps: the growth of the main branches. the growth of the secondary side branches along the main branch, and the tertiary side branches. PLLA growth rates decrease in copolymer films thinner than 1 mu m. Layer-layer phase structure of the copolymer driven by the crystallization of PLLA and the microphase separation of the copolymer appears to be a key factor explaining the crystallization and morphological behavior of this system.
DOI10.1021/la901827q
Indexed BySCI
Language英语
WOS IDWOS:000271522800041
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/65954
Collection中国科学院化学研究所
Corresponding AuthorJiang, Shichun
Affiliation1.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Huang, Shaoyong,Jiang, Shichun,Chen, Xuesi,et al. Dendritic Superstructures and Structure Transitions of Asymmetric Poly(L-lactide-b-ethylene oxide) Diblock Copolymer Thin films[J]. LANGMUIR,2009,25(22):13125-13132.
APA Huang, Shaoyong,Jiang, Shichun,Chen, Xuesi,&An, Lijia.(2009).Dendritic Superstructures and Structure Transitions of Asymmetric Poly(L-lactide-b-ethylene oxide) Diblock Copolymer Thin films.LANGMUIR,25(22),13125-13132.
MLA Huang, Shaoyong,et al."Dendritic Superstructures and Structure Transitions of Asymmetric Poly(L-lactide-b-ethylene oxide) Diblock Copolymer Thin films".LANGMUIR 25.22(2009):13125-13132.
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