TY - GEN
T1 - Enhancement of mechanical properties upon hydration in copolymers of PEG and iodinated tyrosine-derived poycarbonates
AU - Bedoui, F.
AU - Widjaja, L. K.
AU - Luk, A.
AU - Bolikal, D.
AU - Murthy, N. S.
AU - Kohn, J.
PY - 2008
Y1 - 2008
N2 - Increase in modulus upon hydration in copolymers of desaminotyrosyl- tyrosine ethyl ester (DTE) and poly(ethylene glycol) (PEG) with iodinated tyrosines, poly(I2DTE-co-PEG carbonate)s, was investigated by varying the fraction and the molecular weight of the hydrophilic PEG component. Water, as expected, acts as plasticizer in polymer with PEG content < 15 wt% and > 30 wt%. But, water has the opposite effect in iodinated polymers with moderate PEG contents, between 15 to 20 wt%: it enhances the Young's modulus. The strength and modulus of hydrated poly(I2DTE-co-15%PEG 2K carbonate)s increased by as much as fifteen fold upon hydration. While the decrease in the mechanical properties in most polymeric materials with diluents such water is due to the solvent-induced swelling, the increase in strength and modulus that is observed is most likely due to the reinforcing effect of the increased cross-linking efficiency of the hydrated PEG domains in the iodinated polymer.
AB - Increase in modulus upon hydration in copolymers of desaminotyrosyl- tyrosine ethyl ester (DTE) and poly(ethylene glycol) (PEG) with iodinated tyrosines, poly(I2DTE-co-PEG carbonate)s, was investigated by varying the fraction and the molecular weight of the hydrophilic PEG component. Water, as expected, acts as plasticizer in polymer with PEG content < 15 wt% and > 30 wt%. But, water has the opposite effect in iodinated polymers with moderate PEG contents, between 15 to 20 wt%: it enhances the Young's modulus. The strength and modulus of hydrated poly(I2DTE-co-15%PEG 2K carbonate)s increased by as much as fifteen fold upon hydration. While the decrease in the mechanical properties in most polymeric materials with diluents such water is due to the solvent-induced swelling, the increase in strength and modulus that is observed is most likely due to the reinforcing effect of the increased cross-linking efficiency of the hydrated PEG domains in the iodinated polymer.
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M3 - Conference contribution
AN - SCOPUS:77952136626
SN - 9781615677719
T3 - Materials Research Society Symposium Proceedings
SP - 250
EP - 255
BT - Applications of Group IV Semiconductor Nanostructures
T2 - 2008 MRS Fall Meeting
Y2 - 1 December 2008 through 5 December 2008
ER -