QUT ePrints

Synthesis of 4-arm star poly(L-Lactide) oligomers using an in situ-generated calcium-based initiator

George, Karina A., Schue, Francois, Chirila, Traian, & Wentrup-Byrne, Edeline (2009) Synthesis of 4-arm star poly(L-Lactide) oligomers using an in situ-generated calcium-based initiator. Journal of Polymer Science Part A: Polymer Chemistry, 47(18), pp. 4736-4748.

View at publisher

Abstract

Using an in situ-generated calcium-based initiating species derived from pentaerythritol, the bulk synthesis of well-defined 4-arm star poly(L-lactide) oligomers has been studied in detail. The substitution of the traditional initiator, stannous octoate with calcium hydride allowed the synthesis of oligomers that had both low PDIs and a comparable number of polymeric arms (3.7 – 3.9) to oligomers of similar molecular weight. Investigations into the degree of control observed during the course of the polymerization found that the insolubility of pentaerythritol in molten L-lactide resulted in an uncontrolled polymerization only when the feed mole ratio of L-lactide to pentaerythritol was 13. At feed ratios of 40 and greater, a pseudo-living polymerization was observed. As part of this study, in situ FT-Raman spectroscopy was demonstrated to be a suitable method to monitor the kinetics of the ring-opening polymerization (ROP) of lactide. The advantages of using this technique rather than FT-IR-ATR and 1H NMR for monitoring L-lactide consumption during polymerization are discussed.

Impact and interest:

10 citations in Scopus
Search Google Scholar™
9 citations in Web of Science®

Citation countsare sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

377 since deposited on 23 May 2010
80 in the past twelve months

Full-text downloadsdisplays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 29116
Item Type: Journal Article
Additional URLs:
Keywords: poly(L-lactide), star polymers, Raman spectroscopy, kinetics (polym.) , heterogeneous polymerization
DOI: 10.1002/pola.23527
ISSN: 0887-624X
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Polymerisation Mechanisms (030305)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Synthesis of Materials (030306)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2009 Wiley-Blackwell
Deposited On: 24 May 2010 07:21
Last Modified: 01 Mar 2012 00:04

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page