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
Facile synthesis of highly pure block copolymers by combination of RAFT polymerization, click reaction and de-grafting process
來源:趙優良教授個人網站 發布日期:2012-01-29
作者:Guangdong Zhao, Peipei Zhang, Chengbo Zhang and Youliang Zhao*
關鍵字:suprapure block copolymer, RAFT polymerization, click chemistry, graft reaction, hybrid material
論文來源:期刊
具體來源:Polymer Chemistry, 2012, DOI: 10.1039/C1PY00396H
發表時間:2012年

pubs.rsc.org/en/content/articlelanding/2012/py/c1py00396h

A facile strategy to synthesize highly pure block copolymers with polymeric segments such as polystyrene, polyacrylamides and polyacrylates was described. The methodology involves grafting reaction by tandem RAFT polymerization and azide-alkyne cycloaddition reaction and a subsequent de-grafting reaction via aminolysis or radical-induced addition-fragmentation reaction. S-methoxycarbonylphenylmethyl S’-propynyloxycarbonylethyltrithiocarbonate was used to synthesize Z-alkyne-functionalized macro chain transfer agents, and silica particles grafted with well-defined “living” block copolymers were obtained by simultaneous RAFT process and click reaction using clickable RAFT agents and azido-functionalized silica particles as raw materials. This approach afforded grafted polymers with polydispersity typically lower than 1.2 and silica-polymer hybrids with grafting density in the range of 0.020-0.091 chains nm-2 as the grafted chains had molecular weights between 4920 and 26300 g mol-1. Highly pure block copolymers with terminal functionalities such as thiol, methyldithio, carboxyl, hydroxyl and halogen were obtained by de-grafting process and postmodification, and azido-functionalized silica particles were efficiently recovered. The cycles comprising grafting and de-grafting reactions could be applied for many times, and no significant decrease in grafting density was noted, indicating the versatility and generality of this approach for surface modification, synthesis of high-purity block copolymers and recycle of clickable solid substrate.

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: 勐海县| 郧西县| 甘孜| 民乐县| 余姚市| 大英县| 郸城县| 锡林郭勒盟| 司法| 舒城县| 孝昌县| 三穗县| 临夏市| 高台县| 湄潭县| 顺义区| 江口县| 开化县| 北票市| 白水县| 筠连县| 潮安县| 兴文县| 临泉县| 酉阳| 彭州市| 大宁县| 江孜县| 宁德市| 青海省| 阳谷县| 南投市| 广德县| 太康县| 工布江达县| 吉木乃县| 阳朔县| 陈巴尔虎旗| 麻栗坡县| 兴化市| 景德镇市|