Publication: Synthesis and characterizations of PLLA/PEG block copolymers
Issued Date
2010-02-05
Resource Type
ISSN
10226680
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2-s2.0-75649136933
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Mahidol University
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SCOPUS
Bibliographic Citation
Advanced Materials Research. Vol.93-94, (2010), 198-201
Suggested Citation
Thai Hien Nguyen, Atitsa Petchsuk, Pramuan Tangboriboonrat, Mantana Opaprakasit, Alice Sharp, Pakorn Opaprakasit Synthesis and characterizations of PLLA/PEG block copolymers. Advanced Materials Research. Vol.93-94, (2010), 198-201. doi:10.4028/www.scientific.net/AMR.93-94.198 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/29106
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Title
Synthesis and characterizations of PLLA/PEG block copolymers
Abstract
Poly(lactic acid-co-ethylene glycol) (PLLA/PEG) copolymers were synthesized and their properties were characterized. The PLLA/PEG/PLLA triblock copolymers were synthesized by ring-opening polymerization from l-lactide (LLA) and PEG macroinitiator. Stannous octoate, Sn(Oct)2was used as a catalyst. Effects of molecular weight of PEG (600, 2000 and 4000), LLA/OH molar ratios (95:5, 98:2) and a sequence of addition of the reactants on properties of the copolymers were investigated. The triblock copolymers were subsequently used in a production of multiblock copolymers by reacting with a chain-extending agent, hexamethylene diisocyanate (HMDI). Chemical structure and molecular weight of the copolymers were characterized by1HNMR, FTIR and GPC. The results showed that molecular weight of triblock copolymers varied from 4,500 to 10,200. After chain extension, multiblock copolymer with molecular weight of 16,490 was produced. Thermal properties of the copolymers were also examined by DSC. © (2010) Trans Tech Publications.