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(guān)鏈接
聯(lián)系方式
  • 通信地址:中國(guó)江蘇省蘇州市工業(yè)園區(qū)仁愛路199號(hào)蘇州大學(xué)909-3313
  • 郵編:215123
  • 電話:86-0512-65880045
  • 傳真:
  • Email:
當(dāng)前位置:> 首頁 > 論文著作 > 正文
One-Step Synthesis of a Thienylenepyridazinylenethienylene-based Coil-Rod-Coil Copolymer with Enhanced Emission and Improved Fluorescence Stability
作者:Wei Wu, Haibo Xu, Dezhi Shen, Tian Qiu, Li-Juan Fan*
關(guān)鍵字:aggregation,block copolymers,conjugated polymers,fluorescence,oligomers
論文來源:期刊
具體來源:J. Polym. Sci. Part A: Polym. Chem. 2013, 51,1635-1644
發(fā)表時(shí)間:2013年
A new coil-rod-coil copolymer is synthesized via Sonogashira coupling using one-step methodology. The copolymer PEG-OEPETPT-PEG constitutes of poly(ethylene glycol) (PEG) as the coil block, and oligo[p-(ethynylenephenyleneethynylene)-alt-(thienylenepyridazinylenethienylene)] (OEPETPT) as the rod segment. The conjugated polymer PEPETPT with the same conjugated building blocks is also synthesized for comparison.The structures of both polymers are confirmed by NMR, combined with other characterizations. PEG-OEPETPTPEG has a 12 nm blue-shift in the emission maximum compared with that of PEPETPT, and a higher quantum yield of fluorescence
in THF. PEG-OEPETPTE-PEG tolerates up to 20% water content in H2O/THF mixed solvent without significantly changing the emission wavelength and intensity, while the fluorescence of PEPETPT is dramatically quenched by a very small quantity of water. Further photophysical studies about these two polymers indicate that the introduction of PEG coils onto the conjugated block retards the water-induced-aggregation and therefore improves the fluorescence stability of PEG-OEPETPT-PEG。
主站蜘蛛池模板: 静海县| 海南省| 普陀区| 乌鲁木齐县| 汉源县| 祁东县| 嵩明县| 肇州县| 开化县| 芦溪县| 栖霞市| 体育| 司法| 临城县| 新乐市| 区。| 新津县| 汶川县| 百色市| 新田县| 五华县| 许昌县| 宁化县| 乌拉特后旗| 青冈县| 眉山市| 台山市| 土默特左旗| 泰来县| 浮山县| 水富县| 兴化市| 五台县| 宝清县| 合山市| 三穗县| 安西县| 隆尧县| 府谷县| 兴仁县| 武隆县|