ICCAS OpenIR
Lamella reorientation in thin films of a symmetric poly(L-lactic acid)-block-polystyrene upon crystallization at different temperatures
Fu, Jun1; Wei, Yuhan1; Xue, Longjian1; Luan, Bin2; Pan, Caiyuan2; Li, Binyao1; Han, Yanchun1
2009-03-06
Source PublicationPOLYMER
ISSN0032-3861
Volume50Issue:6Pages:1588-1595
AbstractThe thin films of a symmetric crystalline-coil diblock copolymer of poly(L-lactic acid) and polystyrene (PLLA-b-PS) formed lamellae parallel to the substrate surface in melt. When annealed at temperatures well above the glass transition temperature of PLLA block (T(g)(PLLA)), the PLLA chains started to crystallize, leading to reorientation of lamellae. Such reorientation behavior exhibited dependence on the correlation between the crystallization temperature (T(c)), the glass transition temperature of PS (T(g)(PS)), the peak melting point of PLLA crystals (T(m)(PLLA)), and the end melting point of PLLA crystals (T(m,end)(PLLA)). When annealed at (T(c) =) 80 degrees C (T(c) < T(g)(PS) < T(ODT), order-disorder transition temperature), 123 degrees C (T(g)(PS) < T(c) < T(m)(PLLA) < T(ODT)). 165 degrees C (T(g)(PS) < T(m)(PLLA) < T(c) < T(m,end)(PLLA) < T(ODT)), the parallel lamellae became perpendicular to the substrate surface, exclusively starting at the edge of surface relief patterns. Meanwhile, the corresponding lamellar spacing was significantly enhanced. The PLLA crystallization between PS layers was hypothesized to account for the lamella reorientation during annealing. The crystallization, chain conformation, and possible chain folding mechanisms were discussed, based on detailed analysis of the lamellar structure before and after crystallization. (C) 2009 Elsevier Ltd. All rights reserved.
KeywordBlock Copolymer Crystallization Thin Films
DOI10.1016/j.polymer.2009.01.048
Indexed BySCI
Language英语
WOS IDWOS:000264434000029
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/67080
Collection中国科学院化学研究所
Corresponding AuthorHan, Yanchun
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 Polymer Sci & Engn, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Fu, Jun,Wei, Yuhan,Xue, Longjian,et al. Lamella reorientation in thin films of a symmetric poly(L-lactic acid)-block-polystyrene upon crystallization at different temperatures[J]. POLYMER,2009,50(6):1588-1595.
APA Fu, Jun.,Wei, Yuhan.,Xue, Longjian.,Luan, Bin.,Pan, Caiyuan.,...&Han, Yanchun.(2009).Lamella reorientation in thin films of a symmetric poly(L-lactic acid)-block-polystyrene upon crystallization at different temperatures.POLYMER,50(6),1588-1595.
MLA Fu, Jun,et al."Lamella reorientation in thin films of a symmetric poly(L-lactic acid)-block-polystyrene upon crystallization at different temperatures".POLYMER 50.6(2009):1588-1595.
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