Journal
POLYMER
Volume 50, Issue 12, Pages 2565-2571Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.03.060
Keywords
pH/temperature-sensitive hydrogel; Sol-gel transition; Poly(beta-amino ester)
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Funding
- Korea Research Foundation [KRF-2006-005-J04602]
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A series of poly(beta-amino ester)-poly(epsilon-caprolactone)-poly(ethylene glycol)- poly(epsilon-caprolactone)poly(beta-amino ester) pentablock copolymers (PAE-PCL-PEG-PCL-PAE) were designed and prepared to examine factors affecting sol-gel phase transition behavior. First, the composition of a series of PCL-PEG-PCL copolymers was controlled by changing the feed ratios of PCL/PEG and the molecular weight of PEG. Second, the composition of pentablock copolymers was varied using different PCL-PEG-PCL copolymers and several feed ratios of PAE monomers. The physicochemical properties of triblock and pentablock copolymers were characterized by H-1 NMR and gel permeation spectroscopy. The PAE-PCL-PEG-PCL-PAE copolymers in aqueous solution (20-30 wt%) underwent sol-gel transitions with changes in both pH change and temperature. With increasing molecular weight of PAE, the sol-gel transition zone became narrower because the hydrophobic character of the copolymers decreased. Also, with increases in PCL/PEG ratio and PEG molecular weight, changes in the hydrophobic/hydrophilic balance within copolymers resulted in alterations in sol-gel phase transitions. (C) 2009 Elsevier Ltd. All rights reserved.
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