期刊
PHYSICS LETTERS A
卷 379, 期 39, 页码 2515-2519出版社
ELSEVIER
DOI: 10.1016/j.physleta.2015.07.024
关键词
Positron annihilation; Polycarbonate films; Crystallization; Annealing; Free-volume
资金
- National Natural Science Foundation of China (NSFC) [11375132, J1210061]
- Research Foundation of Wuhan University [2042015kf0190]
Crystallization of polycarbonate (PC) films as a function of annealing time has been investigated by various methods. A distinct diffraction peak at 17.56 degrees, a sharp decrease of film thickness, an increase of refractive index and branch-type structures on the surface are found merely for the film after crystallization. Interestingly, positron annihilation parameters demonstrate fractional free-volumes in PC films vary significantly not only before crystallization but also at the early stage of annealing, which are not found by other methods. The results show that free-volumes in PC film must be increased remarkably before crystallization, which enables the occurrence of molecule rearrangement. (C) 2015 Elsevier B.V. All rights reserved.
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