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Enhancement of Mechanical Properties Upon Hydration in Copolymers of PEG and Iodinated Tyrosine-derived Poycarbonates

Published online by Cambridge University Press:  15 March 2011

F. Bedoui ,
L. K. Widjaja ,
A. Luk ,
D. Bolikal ,
N. S. Murthy  and
J. Kohn
F. Bedoui
Affiliation:
New Jersey Center for Biomaterials, Rutgers University, The State University of New Jersey, Piscataway, NJ
L. K. Widjaja
Affiliation:
New Jersey Center for Biomaterials, Rutgers University, The State University of New Jersey, Piscataway, NJ
A. Luk
Affiliation:
Nanyang Technological University, School of Materials Science and Engineering, Singapore
D. Bolikal
Affiliation:
New Jersey Center for Biomaterials, Rutgers University, The State University of New Jersey, Piscataway, NJ
N. S. Murthy
Affiliation:
New Jersey Center for Biomaterials, Rutgers University, The State University of New Jersey, Piscataway, NJ
J. Kohn
Affiliation:
New Jersey Center for Biomaterials, Rutgers University, The State University of New Jersey, Piscataway, NJ
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Abstract

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%PEG2K 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1132: Symposium Z – Mechanics of Biological and Biomedical Materials , 2008 , 1132-Z09-12
Copyright
Copyright © Materials Research Society 2009

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References

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