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

相關鏈接
聯系方式
  • 通信地址:福建省福州市鼓樓區楊橋西路155號
  • 郵編:350002
  • 電話:18563973085
  • 傳真:
  • Email:wanwenming@fjirsm.ac.cn
當前位置:> 首頁 > 論文著作 > 正文
Atom transfer radical dispersion polymerization in an ethanol/water mixture
作者:Wan, Wen-Ming; Pan, Cai-Yuan
關鍵字:分散聚合
論文來源:期刊
具體來源:Macromolecules 2007, 40, 8897-8905.
發表時間:2007年
The atom transfer radical dispersion polymerization of 4-vinylpyridine (4VP) in an ethanol/H2O mixture displayed two stages of polymerization; the first stage is the formation of a diblock copolymer with the polymerization rate of 1.21 mol center dot L-1 center dot h(-1) before 1 h of polymerization, and the second is the main polymerization in micelles formed from the aggregation of the resultant block copolymers with the polymerization rate of 0.009 mol center dot L-1 center dot h(-1). The 2-bromoisobutyryl-terminated poly(ethylene glycol) methyl ether used in the polymerization acts as both a stabilizer and an initiator. The stable micelles with functional core were synthesized by a one-pot strategy via atom transfer radical dispersion copolymerization (ATRDCP) of 4VP and N,N''-methylenebisacrylamide (MBA) in an ethanol/H2O solution for the first time. In the initial stage of polymerization, 4VP and MBA were copolymerized to form a block copolymer, PEG-b-(4VP-co-MBA), with pendent unreacted vinyl groups, and after phase separation at a critical chain length of P4VP-co-PMBA, the cross-linking reaction and polymerization occurred at the same time, resulting in cross-linked micelles. The volume ratio of ethanol/H2O had a big influence on the ATRDCP. An increase in the relative amount of ethanol in the solvent mixture will increase the solubility of P4VP in the polymerization system, the phase separation will be postponed, and the critical chain length of 4VP blocks at the phase separation becomes longer. As a result, the particles size and the 4VP content in the resultant micelles increase. The Au/polymer composite nanoparticles were successfully prepared by complexation of P4VP with HAuCl4 and following reduction with NaBH4.
主站蜘蛛池模板: 凤庆县| 昌图县| 平邑县| 黑水县| 无锡市| 贵港市| 康定县| 内江市| 天全县| 昭平县| 台东县| 南陵县| 九台市| 饶阳县| 巴楚县| 大荔县| 冕宁县| 会同县| 新化县| 长春市| 巧家县| 临武县| 菏泽市| 商水县| 辽阳县| 西安市| 永兴县| 丰台区| 福泉市| 仙桃市| 乌拉特后旗| 崇礼县| 青川县| 库伦旗| 宁强县| 绍兴市| 阳高县| 延川县| 大石桥市| 乐至县| 天气|