ICCAS OpenIR
Crystallization of weakly segregated poly(styrene-b-epsilon-caprolactone) diblock copolymer in thin films
Zhang, FJ; Huang, HY; Hu, ZJ; Chen, YZ; He, TB
2003-11-25
Source PublicationLANGMUIR
ISSN0743-7463
Volume19Issue:24Pages:10100-10108
AbstractThe surface morphology and crystallization behavior of a weakly segregated symmetric diblock copolymer, poly(styrene-b-6-caprolactone) (PS-b-PCL), in thin films were investigated by optical microscopy, X-ray photoelectron spectroscopy, and atomic force microscopy (AFM). When the samples were annealed in the molten state, surface-induced ordering, that is, relief structures with uniform thickness or droplets in the adsorbed monolayer, were observed depending on the annealing temperature. The polar PCL block preferred to wet the surface of a silicon wafer, while the PS block wet the air interface. This asymmetric wetting behavior led to the adsorbed monolayer with a PCL block layer having a thickness of around 4.0 nm. The crystallization of PCL blocks could overwhelm the microphase-separated structure because of the weak segregation. In situ observation of crystal growth indicated that the nucleation process preferred to occur at the edge of the thick parts of the film, that is, the relief structures or droplets. The crystal growth rate was presented by the time dependence of the distance between the tip of crystal clusters and the edge. At 22 and 17 degreesC, the average crystal growth rates were 55 +/- 10 and 18 +/- 4 nm/min, respectively. Nevertheless, at a low crystallization temperature (17 degreesC), the formation of a primary nucleus and subsequent growth in the adsorbed monolayer with a crystalline PCL layer of 4.0 nm were directly observed by real-time AFM. It was concluded that the primary nucleus formed at the polymer/substrate interface and the average growth rate for individual edge-on lamellae at 17 degreesC was about 12 nm/min. The nucleation mechanism in the adsorbed monolayer was discussed, and the influence of the polymer/substrate interface and weak segregation accounted for the nucleation process.
DOI10.1021/la035290m
Indexed BySCI
Language英语
WOS IDWOS:000186694500019
PublisherAMER CHEMICAL SOC
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/80816
Collection中国科学院化学研究所
Corresponding AuthorZhang, FJ
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China
Recommended Citation
GB/T 7714
Zhang, FJ,Huang, HY,Hu, ZJ,et al. Crystallization of weakly segregated poly(styrene-b-epsilon-caprolactone) diblock copolymer in thin films[J]. LANGMUIR,2003,19(24):10100-10108.
APA Zhang, FJ,Huang, HY,Hu, ZJ,Chen, YZ,&He, TB.(2003).Crystallization of weakly segregated poly(styrene-b-epsilon-caprolactone) diblock copolymer in thin films.LANGMUIR,19(24),10100-10108.
MLA Zhang, FJ,et al."Crystallization of weakly segregated poly(styrene-b-epsilon-caprolactone) diblock copolymer in thin films".LANGMUIR 19.24(2003):10100-10108.
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