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:中國江蘇省蘇州市工業園區仁愛路199號蘇州大學909-3313
  • 郵編:215123
  • 電話:86-0512-65880045
  • 傳真:
  • Email:
當前位置:> 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
發表時間: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: 浮山县| 崇阳县| 龙州县| 涟源市| 论坛| 文水县| 宁化县| 年辖:市辖区| 昌邑市| 师宗县| 巴楚县| 镇赉县| 太和县| 石台县| 苍南县| 杭锦旗| 平邑县| 芦溪县| 宜黄县| 龙江县| 井陉县| 渭南市| 剑川县| 正阳县| 明溪县| 莎车县| 余江县| 巴彦淖尔市| 桦甸市| 两当县| 宜章县| 灯塔市| 会宁县| 普宁市| 肇州县| 工布江达县| 兰考县| 东城区| 颍上县| 永州市| 边坝县|