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Title: Synthesis and characterizations of PLLA/PEG block copolymers
Authors: Thai Hien Nguyen
Atitsa Petchsuk
Pramuan Tangboriboonrat
Mantana Opaprakasit
Alice Sharp
Pakorn Opaprakasit
Sirindhorn International Institute of Technology, Thammasat University
Thailand National Metal and Materials Technology Center
Mahidol University
Chulalongkorn University
Keywords: Engineering
Issue Date: 5-Feb-2010
Citation: Advanced Materials Research. Vol.93-94, (2010), 198-201
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.
ISSN: 10226680
Appears in Collections:Scopus 2006-2010

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