%0 Journal Article
%T SYNTHESIS AND CHARACTERIZATION OF AN OPTICAL ACTIVE TRIBLOCK COPOLYMER via ATOM TRANSFER RADICAL POLYMERIZATION<br>一种光学活性三嵌段共聚物的ATRP合成及表征
%A FENG Liang
%A HU Jiwen
%A XIAO Dingshu
%A ZHAO Fabao
%A LIU Zhilei
%A <br>冯良
%A 胡继文
%A 肖定书
%A 赵发宝
%A 刘志雷
%J 高分子学报
%D 2007
%I 
%X An optical active triblock copolymer poly(N-methacryloyl-L-leucine methyl ester)-b-polysulfone-b-poly-(N-methacryloyl-L-leucine methey ester)(PMALM-b-PSF-b-PMALM)with predetermined structure and narrow molecular weight distribution was synthesized via atom transfer radical polymerization(ATRP)using polysulfone macroinitiator and CuBr/Me_6TREN complex system.The structure was verified by 1H-NMR,GPC and end group titration techniques.DSC,thermogravimetry analysis(TGA)and circular dichroism(CD)were used to study the thermal and optical properties.The mole ratio of PMALM block to PSF block calculated from TGA has a good agreement with the result calculated from 1H-NMR.Both a reversion and an increase of the absolute value of specific rotation in the transformation from MALM to PMALM-b-PSF-b-PMALM were observed,which were probably caused by some kind of stereostructure of the main chain formed during the polymerization due to the intermolecular hydrogen-bonding.The random conformation of PMALM blocks was verified by CD spectra and the linear relationship between the specific rotation and the polarity of CH_3OH/CCl_4 mixed solvent.
%K Atom transfer radical polymerization(ATRP)
%K Polysulfone
%K L-Leucine
%K Optical active polymer<br>原子转移自由基聚合
%K 聚砜
%K L-亮氨酸
%K 光学活性聚合物
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=6579068328FE643F&jid=15971983683C7643EE80F1CE621DEB60&aid=9EDE2BDBE30B0D0E&yid=A732AF04DDA03BB3&iid=94C357A881DFC066&sid=09AA1448D1EAF9C1&eid=65C08888CCE4801E&journal_id=1000-3304&journal_name=高分子学报&referenced_num=1&reference_num=36