四氟乙烯
薄膜
真空蒸发
材料科学
蒸发
结晶度
吸热过程
真空沉积
基质(水族馆)
超高真空
复合材料
化学工程
高分子化学
聚合物
纳米技术
化学
有机化学
工程类
吸附
地质学
物理
海洋学
热力学
共聚物
作者
Yasutaka Ohnishi,R. Kita,Kazuyoshi Tsuchiya,Satoru Iwamori
标识
DOI:10.7567/jjap.55.02bb04
摘要
Abstract Poly(tetrafluoroethylene) (PTFE) thin films were deposited onto a glass slide substrate by a heat-resistance type vacuum evaporation apparatus due to changing the evaporation conditions. Transparency of the PTFE thin films prepared by the vacuum evaporation depended on the deposition conditions, i.e., temperatures of the basket, and distance between the evaporation source and substrate. To elucidate relationship between the molecular structure and transparency of the PTFE thin film prepared by the vacuum evaporation, chemical structures, crystallinity and thermophysical property were investigated. The chemical bonding state of the PTFE thin film prepared by the vacuum evaporation was almost the same as that of the pristine PTFE, however, the crystalinity was different. Although the pristine PTFE was crystal structure, the transparent evaporated thin film was estimated to be microcrystal structure. In addition, endothermic peaks in a differential scanning calorimeter (DSC) spectrum of the PTFE thin film were different from that of the pristine PTFE. These endothermic peaks of the PTFE thin film prepared by the vacuum evaporation shifted lower temperature compared to the pristine PTFE, which suggests that molecular weight of the PTFE thin film prepared by the vacuum evaporation decreased compared with that of the pristine PTFE.
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