Interplay between Free Surface and Solid Interface Nucleation on Two-Step Crystallization of Poly(ethylene terephthalate) Thin Films Studied by Fast Scanning Calorimetry
- Shaochuan LuoShaochuan LuoDepartment of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaMore by Shaochuan Luo
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- Xing KuiXing KuiDepartment of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaMore by Xing Kui
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- Enran XingEnran XingDepartment of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaMore by Enran Xing
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- Xiaoliang WangXiaoliang WangDepartment of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaMore by Xiaoliang Wang
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- Gi XueGi XueDepartment of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaMore by Gi Xue
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- Christoph SchickChristoph SchickInstitute of Physics, University of Rostock, Wismarsche Str. 43-45, 18051 Rostock, GermanyMore by Christoph Schick
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- Wenbing HuWenbing HuDepartment of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaMore by Wenbing Hu
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- Evgeny Zhuravlev*Evgeny Zhuravlev*(E.Z.) E-mail [email protected]Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaInstitute of Physics, University of Rostock, Wismarsche Str. 43-45, 18051 Rostock, GermanyShenzhen Research Institute, Nanjing University, Shenzhen 518057, P. R. ChinaMore by Evgeny Zhuravlev
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- Dongshan Zhou*Dongshan Zhou*(D.Z.) E-mail [email protected]Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, and The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. ChinaSchool of Physical Science and Technology, Xinjiang Key Laboratory and Phase Transitions and Microstructures in Condensed Matters, Yili Normal University, Yining 835000, P. R. ChinaMore by Dongshan Zhou
Abstract
Under confinement, unique features of crystallization arise, among which the slowing down and accelerating crystallization on cooling are both reported. The controversy can be resolved by performing isothermal crystallization experiments, taking into account temperature dependence of crystal nucleation and growth. The isothermal experiments of thin films were performed for the first time in this work in the wide range of thicknesses and wide range of temperatures, where it crystallizes. Fast scanning calorimetry (FSC, Flash DSC 1) was used to reach fast cooling and heating, avoiding crystallization and unwanted reorganization. Thin films of poly(ethylene terephthalate) (PET) were studied from 23 nm thickness with free surface and covered by a PS layer. Two-step crystallization was observed by FSC in films thinner than 60 nm at temperatures of crystallization below 140 °C. Evidence of strong free-surface-induced precrystallization was confirmed by atomic force microscopy (AFM). It was observed that highly mobile surface layer formed dendritic crystals first and then bulk layer formed spherulites. When we used thicker films or films crystallized at low undercoolings, no two-step crystallization was observed neither in FSC nor in AFM, presumably due to domination of bulk crystallization. Heterogeneous nucleation at the solid interface with crystalline poly(ether ether ketone) (PEEK) covering layer enhances crystallization at high temperatures. These results not only help to rationalize contradictory reports in the literature but also provide a strong methodology for study of crystallization and nanotechnology.
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