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:上海市寶山區上大路99號152信箱上海大學東區材料樓801室
  • 郵編:200444
  • 電話:021-66138053
  • 傳真:021-66131720
  • Email:azhang@shu.edu.cn
當前位置:> 首頁 > 論文著作 > 正文
Thermoresponsive Dendronized Polymers
作者:Wen Li, Afang Zhang,* Kirill Feldman, Peter Walde, A. Dieter Schlüter
關鍵字:Dendronized polymer, thermoresponsive, phase transition, EPR spectroscopy
論文來源:期刊
具體來源:Macromolecules 2008, 41, 3659–3667
發表時間:2008年

The efficient synthesis of high molar mass, first- (G1) and second-generation (G2) dendronized polymethacrylate derivatives PG1 and PG2, respectively, and their thermoresponsive properties in aqueous solution are described. All dendrons are branched 3-fold and were synthesized on the multigram scale using gallic acid as branching point and tri(ethylene glycol) (TEG) units as linker. The corresponding macromonomers carry methoxy groups in the periphery and are water-soluble, which allows polymerizing in aqueous medium. For comparison, PG1 and PG2 were also prepared in DMF solution and in bulk. These polymers are fully soluble in water at room temperature and turn turbid at elevated temperatures (approximately 62-65 oC), a phenomenon that is typically referred to as thermoresponsiveness. This phase transition was investigated by 1H NMR spectroscopy and turbidity measurements using UV/vis spectroscopy. The effect of molar mass and concentration on this transition was examined. In accordance with the normal usage, this transition temperature is referred to as lower critical solution temperature (LCST). Aggregates with sizes in the range of a few micrometers were observed above the LCSTs by conventional optical microscopy. Finally, the thermally induced aggregation and deaggregation processes were video-taped in high resolution.

主站蜘蛛池模板: 龙胜| 垣曲县| 福海县| 泽普县| 临海市| 武城县| 庄浪县| 彭水| 东辽县| 会昌县| 沾化县| 乐至县| 呈贡县| 汉阴县| 积石山| 黑龙江省| 永州市| 安义县| 黄骅市| 汉阴县| 册亨县| 蕲春县| 萝北县| 天津市| 腾冲县| 遂平县| 昆山市| 图片| 珠海市| 启东市| 修文县| 含山县| 台东市| 博爱县| 长治县| 封开县| 科技| 南昌市| 钦州市| 延边| 漳平市|