Synthesis of four-armed poly(epsilon-caprolactone)-block-poly(ethylene oxide) by diethylzinc catalyst
文献类型：期刊论文
| 作者 | Deng, MX; Chen, XS; Piao, LH; Zhang, XF; Dai, ZL; Jing, XB |
| 刊名 | JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
 |
| 出版日期 | 2004-02-15 |
| 卷号 | 42期号:4页码:950-959 |
| 关键词 | Star Polymers Ring-opening Polymerization Biodegradable Poly(Epsilon-caprolactone) Poly(Ethylene Oxide) Diethylzinc |
| ISSN号 | 0887-624X |
| DOI | 10.1002/pola.11052 |
| 英文摘要 | Biodegradable, amphiphilic, four-armed poly(epsilon-caprolactone)-block-poly(ethylene oxide) (PCL-b-PEO) copolymers were synthesized by ring-opening polymerization of ethylene oxide in the presence of four-armed poly(epsilon-caprolactone) (PCL) with terminal OH groups with diethylzinc (ZnEt2) as a catalyst. The chemical structure of PCL-b-PEO copolymer was confirmed by H-1 NMR and C-13 NMR. The hydroxyl end groups of the four-armed PC L were successfully substituted by PEO blocks in the copolymer. The monomodal profile of molecular weight distribution by gel permeation chromatography provided further evidence for the four-armed architecture of the copolymer. Physicochemical properties of the four-armed block copolymers differed from their starting four-armed PCL precursor. The melting points were between those of PCL precursor and linear poly(ethylene glycol). The length of the outer PEO blocks exhibited an obvious effect on the crystallizability of the block copolymer. The degree of swelling of the four-armed block copolymer increased with PEO length and PEO content. The micelle formation of the four-armed block copolymer was examined by a fluorescent probe technique, and the existence of the critical micelle concentration (cmc) confirmed the amphiphilic nature of the resulting copolymer. The cmc value increased with increasing PEO length. The absolute cmc values were higher than those for linear amphiphilic block copolymers. (C) 2004 Wiley Periodicals, Inc. |
| 语种 | 英语 |
| WOS记录号 | WOS:000188591600015 |
| 出版者 | JOHN WILEY & SONS INC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/55087]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Chen, XS |
| 作者单位 | Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Deng, MX,Chen, XS,Piao, LH,et al. Synthesis of four-armed poly(epsilon-caprolactone)-block-poly(ethylene oxide) by diethylzinc catalyst[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2004,42(4):950-959. |
| APA | Deng, MX,Chen, XS,Piao, LH,Zhang, XF,Dai, ZL,&Jing, XB.(2004).Synthesis of four-armed poly(epsilon-caprolactone)-block-poly(ethylene oxide) by diethylzinc catalyst.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,42(4),950-959. |
| MLA | Deng, MX,et al."Synthesis of four-armed poly(epsilon-caprolactone)-block-poly(ethylene oxide) by diethylzinc catalyst".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 42.4(2004):950-959. |
入库方式： OAI收割
来源：化学研究所
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