私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

當前位置:群英聚首 > 論文著作 > 正文
Temperature dependence of surface composition and morphology in polymer blend film.
來源:廖永貴副教授個人網站 發布日期:2009-09-22
作者:Jichun You, Tongfei Shi, Yonggui Liao, Xinglin Li, Zhaohui Su, Lijia An.
關鍵字:Polymer 2008, 49: 4456-4461.
論文來源:期刊

Thin films of poly(methyl methacrylate) (PMMA) and poly(styrene-ran-acrylonitrile) (SAN) blend can phase separate upon heating to above its critical temperature. Temperature dependence of the surface composition and morphology in the blend thin film upon thermal treatment was studied using in situ X-ray photoelectron spectroscopy (XPS) and in situ atomic force microscopy (AFM). It was found that in addition to phase separation, the blend component preferentially diffused to and aggregated at the surface of the blend film, leading to the variation of surface composition with temperature. At 185 C, above the critical temperature, the amounts of PMMA and SAN phases were comparable. At lower temperatures PMMA migrated to the surface, leading to a much higher PMMA surface content than in the bulk. The migration and preferential segregation of a blend component in thin films demonstrated here are responsible for the great difference between in situ and ex situ experimental (not real quenching or annealing) results of polymer blend films, and help explain the slow kinetics of surface phase separation at early stage for blend thin films reported in literature. This is significant for the control of surface properties of polymer materials.

Copyright © 2005 Polymer.cn All rights reserved
中國聚合物網 版權所有
經營性網站備案信息

京公網安備11010502032929號

工商備案公示信息

京ICP證050801號

京ICP備12003651號

主站蜘蛛池模板: 石景山区| 吐鲁番市| 泸溪县| 通榆县| 无锡市| 东城区| 梅河口市| 郴州市| 巴青县| 隆尧县| 钟山县| 景东| 卓尼县| 台江县| 霍州市| 凭祥市| 塔河县| 乐昌市| 镇康县| 庄河市| 察雅县| 原阳县| 丹棱县| 道真| 日照市| 金阳县| 新建县| 康定县| 冀州市| 万荣县| 阿荣旗| 门头沟区| 滨州市| 克拉玛依市| 阿城市| 汝州市| 文登市| 柯坪县| 枝江市| 永昌县| 玉田县|