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Study on the origin of inverted phase in drying solution-cast block copolymer films
Huang, HY; Zhang, FJ; Hu, ZJ; Du, BY; He, TB; Lee, FK; Wang, YJ; Tsui, OKC
2003-06-03
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume36Issue:11Pages:4084-4092
AbstractIn a previous study, we reported observation of the novel inverted phase (the minority blocks comprising the continuum phase) in kinetically controlled phase separating solution-cast poly(styrene-b-butadiene-b-styrene) (SBS) triblock copolymer films [Zhang et al. Macromolecules 2000, 33, 9561-7]. In this study, we adopt the same approach to investigate the formation of inverted phase in a series of solution-cast poly(styrene-b-butadiene) (SB) asymmetric diblock copolymers having nearly equal polystyrene (PS) weight fraction (about 30 wt %) but different molecular weights. The microstructure of the solution-cast block copolymer films resulting from different solvent evaporation rates, R, was inspected, from which the kinetically frozen-in phase structures at qualitatively different block copolymer concentrations and correspondingly different effective interaction parameter, chieff, can be deduced. Our result shows that there is a threshold molecular weight or range of molecular weight below which the unusual inverted phase is accessible by controlling the solvent evaporation rate. In comparing the present result with that of our previous study on the SBS triblock copolymer, we find that the formation of the inverted phase has little bearing on the chain architecture. We performed numerical calculations for the free energy of block copolymer cylinders and found that the normal phase is always preferred irrespective of the interaction parameter and molecular weight, which suggests the formation of the inverted phase to have a kinetic origin. A mechanism based on kinetic effects is proposed to account for the observed threshold in molecular weight.
DOI10.1021/ma0217581
Indexed BySCI
Language英语
WOS IDWOS:000183247700047
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:45[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79776
Collection中国科学院化学研究所
Corresponding AuthorHe, TB
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Huang, HY,Zhang, FJ,Hu, ZJ,et al. Study on the origin of inverted phase in drying solution-cast block copolymer films[J]. MACROMOLECULES,2003,36(11):4084-4092.
APA Huang, HY.,Zhang, FJ.,Hu, ZJ.,Du, BY.,He, TB.,...&Tsui, OKC.(2003).Study on the origin of inverted phase in drying solution-cast block copolymer films.MACROMOLECULES,36(11),4084-4092.
MLA Huang, HY,et al."Study on the origin of inverted phase in drying solution-cast block copolymer films".MACROMOLECULES 36.11(2003):4084-4092.
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