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Strontium-based initiator system for ring-opening polymerization of cyclic esters
Tang, ZH; Chen, XS; Hang, QZ; Bian, XC; Yang, LX; Piao, LH; Jing, XB
2003-07-01
Source PublicationJOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
ISSN0887-624X
Volume41Issue:13Pages:1934-1941
AbstractAn amino isopropoxyl strontium (Sr-PO) initiator, which was prepared by the reaction of propylene oxide with liquid strontium ammoniate solution, was used to carry out the ring-opening polymerization (ROP) of cyclic esters to obtain aliphatic polyesters, such as poly(epsilon-caprolactone) (PCL) and poly(L-lactide) (PLLA). The Sr-PO initiator demonstrated an effective initiating activity for the ROP of epsilon-caprolactone (epsilon-CL) and L-lactide (LLA) under mild conditions and adjusted the molecular weight by the ratio of monomer to Sr-PO initiator. Block copolymer PCL-b-PLLA was prepared by sequential polymerization of epsilon-CL and LLA, which was demonstrated by H-1 NMR, C-13 NMR, and gel permeation chromatography. The chemical structure of Sr-PO initiator was confirmed by elemental analysis of Sr and N, H-1 NMR analysis of the end groups in epsilon-CL oligomer, and Fourier transform infrared (FTIR) spectroscopy. The end groups of PCL were hydroxyl and isopropoxycarbonyl, and FTIR spectroscopy showed the coordination between Sr-PO initiator and model monomer gamma-butyrolactone. These experimental facts indicated that the ROP of cyclic esters followed a coordination-insertion mechanism, and cyclic esters exclusively inserted into the Sr-O bond. (C) 2003 Wiley Periodicals, Inc.
KeywordStrontium Initiators Ring-opening Polymerization Polyesters
DOI10.1002/pola.10740
Indexed BySCI
Language英语
WOS IDWOS:000183564300007
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:55[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81048
Collection中国科学院化学研究所
Corresponding AuthorChen, XS
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Tang, ZH,Chen, XS,Hang, QZ,et al. Strontium-based initiator system for ring-opening polymerization of cyclic esters[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2003,41(13):1934-1941.
APA Tang, ZH.,Chen, XS.,Hang, QZ.,Bian, XC.,Yang, LX.,...&Jing, XB.(2003).Strontium-based initiator system for ring-opening polymerization of cyclic esters.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,41(13),1934-1941.
MLA Tang, ZH,et al."Strontium-based initiator system for ring-opening polymerization of cyclic esters".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 41.13(2003):1934-1941.
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