Synthesis and characterization of optically active block copolymer with thermo-responsive characteristic via "click" reaction
文献类型：期刊论文
| 作者 | Liu Zhilei1,2; Sun Jianping1; Hu Jiwen1 |
| 刊名 | Acta polymerica sinica
 |
| 出版日期 | 2010-06-20 |
| 期号 | 6页码:705-713 |
| ISSN号 | 1000-3304 |
| 关键词 | Reversible addition-fragmentation chain transfer (raft) polymerization "click" chemistry Lower critical solution temperature (lcst) Optically active polymer |
| 通讯作者 | Liu zhilei() |
| 英文摘要 | Thermoresponsive and optically active polymer poly(n-acryloyl-l-valine n'-methylamide) (pavma-c ch) bearing amino acidamide moieties in the side chain was synthesized via reversible addition-fragmentation chain transfer (raft) polymerization using 2-dodecylsulfanylthiocarbonylsulfanyl-2-methyl-propionic acid propargyl alcohol ester (dmpe) with alkyne group in the end as the chain transfer agent (cta). diblock copolymer mpeg-b-pavma was then prepared from "click" coupling reaction between pavma-c ch and polyethylene glycol monomethylether capped by azide group (mpeg(115)-n(3)) in conjunction with cuso(4)/ascorbate sodium as catalytic system. the chemical structures and molecular characters were evaluated by (1)h-nmr and size exclusion chromatography (sec), respectively. the number of repeating unit for mpeg and pavma was 115 and 55, respectively, which was calculated from (1)h-nmr analysis. the lower critical solution temperatures (lcsts) for pavma and mpeg-b-pavma in water were 6.5 degrees c and 19.5 degrees c, respectively, which were measured by transmittance tests on a uv-vis spectrophotometer equipped with a temperature controller system. specific optical rotation results showed that optical activity of the prepared pavma-c ch homopolymer and corresponding mpeg-b-pavma copolymer decreased comparing with that of monomer (avma) due to the variation of micro-conformation during polymerization. circular dichroism (cd) spectra for the aqueous solution of resulted polymers at 5 degrees c exhibit a weak cotton effect peak at about 220 nm and a strong negative cotton effect peak at around 197 nm, indicating random coil conformation for polymer chains in solution. |
| WOS关键词 | TRANSFER RADICAL POLYMERIZATION ; L-PHENYLALANINE MOIETY ; AMINO-ACID MOIETIES ; RAFT POLYMERIZATION ; POLYMERS ; CHEMISTRY ; ACRYLAMIDE ; TACTICITY ; DERIVATIVES ; TRANSITION |
| WOS研究方向 | Polymer Science |
| WOS类目 | Polymer Science |
| 语种 | 英语 |
| 出版者 | SCIENCE CHINA PRESS |
| WOS记录号 | WOS:000279101000015 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2408573 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Liu Zhilei |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Chem, Guangzhou 510650, Guangdong, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Zhilei,Sun Jianping,Hu Jiwen. Synthesis and characterization of optically active block copolymer with thermo-responsive characteristic via "click" reaction[J]. Acta polymerica sinica,2010(6):705-713. |
| APA | Liu Zhilei,Sun Jianping,&Hu Jiwen.(2010).Synthesis and characterization of optically active block copolymer with thermo-responsive characteristic via "click" reaction.Acta polymerica sinica(6),705-713. |
| MLA | Liu Zhilei,et al."Synthesis and characterization of optically active block copolymer with thermo-responsive characteristic via "click" reaction".Acta polymerica sinica .6(2010):705-713. |
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来源：中国科学院大学
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