Ring-opening polymerization and block copolymerization of L-lactide with divalent samarocene complex
Data(s) |
2003
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Resumo |
Divalent samarocene complex [(C5H9C5H4)(2)Sm(tetrahydrofuran)(2)] was prepared and characterized and used to catalyze the ring-opening polymerization of L-lactide (L-LA) and copolymerization of L-LA with caprolactone (CL). Several factors affecting monomer conversion and molecular weight of polymer, such as polymerization time, temperature, monomer/catalyst ratio, and solvent, were examined. The results indicated that polymerization was rapid, with monomer conversions reaching 100% within 1 h, and the conformation of L-LA was retained. The structure of the block copolymer of CL/L-LA was characterized by NMR and differential scanning calorimetry. The morphological changes during crystallization of poly(caprolactone) (PCL)-b-P(L-LA) copolymer were monitored with real-time hot-stage atomic force microscopy (AFM). The effect of temperature on the morphological change and crystallization behavior of PCL-b-P(L-LA) copolymer was demonstrated through AFM observation. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Cui DM;Tang T;Bi WG;Cheng JH;Chen WQ;Huang BT.Ring-opening polymerization and block copolymerization of L-lactide with divalent samarocene complex,JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY ,2003,41(17):2667-2675 |
Palavras-Chave | #LINK-FUNCTIONALIZED POLYMERS #HIGHLY EFFICIENT CATALYST #EPSILON-CAPROLACTONE #LIVING POLYMERIZATIONS #SAMARIUM COMPLEXES #POLY(LACTIC ACID) #DL-LACTIDE #LACTONES #INITIATORS #DERIVATIVES |
Tipo |
期刊论文 |