Journal
EUROPEAN POLYMER JOURNAL
Volume 44, Issue 2, Pages 465-474Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2007.11.008
Keywords
poly(p-dioxa none); hydroxyl-terminated; chain extending; toluene-2,4-diisocyanate
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As poly(p-dioxanone) (PPDO) with a high molecular weight (viscosity-average molecular weight (M-v) > 100,000 g/mol) is not easy to be obtained in a short time, a new approach has been developed to produce high molecular weight poly(p-dioxanone) (HPPDO-T) by chain-extending reaction of hydroxyl-terminated PPDO (HPPDO) prepolymers using toluene-2,4-diisocyanate (TDI) as chain extender. Here HPPDO prepolymers were synthesized via ring-opening polymerization of p-dioxanone (PDO) monomer initiated by 1,4-butanediol (BD) with Stannous octoate (SnOct(2)) as catalyst. The resulting polymers, having a highest Mv of 250,000 g/mol, were characterized by H-1 NMR, TG, DSC and WXRD. HPPDO prepolymers can react with TDI more effectively than the PPDO prepolymers initiated by mono-functional initiators, and the molecular weights of resulting chain-extended products increase several decade times in an hour comparing to the prepolymers. The chain extended products HPPDO-T have better thermal stability, and higher glass transition temperatures and lower crystallization rates than PPDO homopolymer. (c) 2007 Elsevier Ltd. All rights reserved.
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