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Studies on confined crystallization behavior of polycaprolactone thin films |
| QIAO Congde1, JI Xiangling1, AN Lijia1, JIANG Bingzheng1, JIANG Shichun2 |
| 1.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; 2.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; Department of Material Science & Engineering, Shandong Institute of Light Industry, Jinan 250100, China; |
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Abstract The confined crystallization behavior of polycaprolactone (PCL) in thin and ultrathin films was studied by AFM (atomic force microscopy). It was found that the crystalline morphology of PCL depended on the film’s thickness. When the thickness is d>2 Rg (radius of gyration), the polymer can crystallize into spherulites; when Rg<d<2 Rg, a dense-branch morphology and dendrites could be found; when d<Rg, an islands structure could be obtained. Moreover, the effects of the crystallization temperature and the substrate and the molecular weight on the crystalline morphology were discussed. It was shown that the crystallization of PCL in thin films is a diffusion-controlled process, and it can be explained by diffusion-limited aggregation.
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Issue Date: 05 December 2007
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