Controlled and stereospecific polymerization of rac-lactide with a single-site ethyl aluminum and alcohol initiating system
文献类型：期刊论文
| 作者 | Tang, ZH; Yang, YK; Pang, X; Hu, JL; Chen, XS; Hu, NH; Jing, XB |
| 刊名 | Journal of applied polymer science
 |
| 出版日期 | 2005-10-05 |
| 卷号 | 98期号:1页码:102-108 |
| 关键词 | Ring-opening polymerization Block copolymers Stereospecific polymers |
| ISSN号 | 0021-8995 |
| DOI | 10.1002/app.22049 |
| 通讯作者 | Chen, xs() |
| 英文摘要 | A single-site ethyl aluminum complex, [2,2-diethyl-1,3-propylenebis(3,5-di-tert-butyl-salicylideneimi- nato)] ethyl aluminum (2), with a geminal diethyl substitutent on the diamino bridge was synthesized by the reaction of alet3 with 1 equiv of n,n'-(2,2-diethyl-1,3-propylene)bis(3,5-di-tert-butylsalicylideneimine). x-ray diffraction showed that complex 2 contained a five-coordinate aluminum atom with a distorted trigonal bipyramidal geometry in the solid state. h-1-nmr and c-13-nmr spectra indicated that the two conformational enantiomers of 2 tautomerized quickly on the nmr timescale in solution. in the presence of isopropyl alcohol, the ring-opening polymerization (rop) of rac-lactide with complex 2 produced a crystalline stereoblock polylactide (pla). the stereoblocks contained an average of 12 units (l = 12) of enantiomerically pure lactic acid. there was a linear relationship between the monomer conversion and number-average molecular weights of the polymer. an induction period was observed for the polymerization. the induction period increased with decreasing concentration of catalyst 2 and isopropyl alcohol. in the presence of poly(ethylene glycol) (peg), a pla/peg/pla stereocomplex was prepared directly by the rop of rac-lactide with complex 2, which was confirmed by nmr, gel permeation chromatography, wide-angle x-ray diffraction, and differential scanning calorimetry. (c) 2005 wiley periodicals, inc. |
| WOS关键词 | RING-OPENING POLYMERIZATION ; PLA/PEO/PLA TRIBLOCK COPOLYMERS ; STEREOCOMPLEX FORMATION ; RACEMIC LACTIDE ; STEREOSELECTIVE POLYMERIZATION ; HYDROLYTIC DEGRADATION ; POLY(LACTIC ACID) ; BLOCK-COPOLYMERS ; BASE COMPLEX ; MECHANISM |
| WOS研究方向 | Polymer Science |
| WOS类目 | Polymer Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000231367700015 |
| 出版者 | JOHN WILEY & SONS INC |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2377963 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Chen, XS |
| 作者单位 | Chinese Acad Sci, Changchun Inst Appl Chem, Grad Sch, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, ZH,Yang, YK,Pang, X,et al. Controlled and stereospecific polymerization of rac-lactide with a single-site ethyl aluminum and alcohol initiating system[J]. Journal of applied polymer science,2005,98(1):102-108. |
| APA | Tang, ZH.,Yang, YK.,Pang, X.,Hu, JL.,Chen, XS.,...&Jing, XB.(2005).Controlled and stereospecific polymerization of rac-lactide with a single-site ethyl aluminum and alcohol initiating system.Journal of applied polymer science,98(1),102-108. |
| MLA | Tang, ZH,et al."Controlled and stereospecific polymerization of rac-lactide with a single-site ethyl aluminum and alcohol initiating system".Journal of applied polymer science 98.1(2005):102-108. |
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来源：中国科学院大学
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