摘要
采用旋涂法在硅片上镀聚碳酸酯薄膜.将聚碳酸酯薄膜在200℃下进行不同时长的退火处理后,利用正电子湮没多普勒展宽测量技术与原子力显微镜研究不同退火时间对聚碳酸酯薄膜结晶现象的影响.研究结果表明,慢正电子束多普勒展宽测量技术对于聚碳酸酯薄膜早期结晶行为非常敏感.随着退火时间增长,聚碳酸酯薄膜的结晶度增加,高分子结晶过程之中伴随着原子尺度的自由体积大小和浓度而变化,结晶程度与退火时间有着非常紧密的关系.
In this paper,polycarbonate thin films were spin-coated on silicon wafers.All polycarbonate films were subjected to 200℃annealing for various times in vacuum.Positron annihilation Doppler broadening spectroscopy based on a slow positron beam and Atomic Force Microscope were used to investigate crystallization behavior of polycarbonate films with different annealing time.Results show that positron annihilation Doppler broadening spectroscopy is sensitive to the crystallization of polycarbonate films.With increasing the annealing time,crystallization of the polycarbonate films increases,accompanied by the change of the size and concentration of free volumes.And annealing time significantly affects the crystallinity of polycarbonate films.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2014年第2期111-114,共4页
Journal of Wuhan University:Natural Science Edition
基金
国家自然科学基金资助项目(10975108)
关键词
聚碳酸酯
薄膜
旋涂法
结晶
正电子湮没
polycarbonate
thin film
spincast
crystallization
positron annihilation
