Melting behavior of lamellae of isotactic polypropylene studied using hot-stage atomic force microscopy |
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| Authors: | Xi Wang Weimin Hou Jianjun Zhou Lin Li Yang Li Chi-Ming Chan |
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| Institution: | (1) Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China;(2) Department of Polymer Science and Materials, The School of Chemical Engineering, Dalian University of Technology, Dalian, 116012, China;(3) Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China;(4) Present address: Graduate School of the Chinese Academy of Sciences, Beijing, China |
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| Abstract: | The α- and β-form lamellae of isotactic polypropylene were developed at different temperatures. The melting behaviors of the
lamellae were observed in real time at elevated temperatures using a hot-stage atomic force microscopy. The melting behavior
of the α-form lamellae was determined by the lamellar defects. For the α-form lamellae developed at different undercoolings,
the larger the undercoolings, the relatively higher amount of defect in the lamellae was observed. The lamellae with defects
were melted into lamellar segments, and recrystallization took place during the heating process. The β-form lamellae had lower
thermal stability, and they melted firstly and separately from that of α-form. |
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| Keywords: | Isotactic polypropylene Melting Atomic force microscopy (AFM) Lamellae |
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