Journal
POLYMER DEGRADATION AND STABILITY
Volume 121, Issue -, Pages 238-246Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2015.09.017
Keywords
Polymer composites; Silver nanocomposites; Biopolyurethanes; Thermal properties; Hydrolytic stability
Categories
Funding
- UEFISCDI [BIONANOMED 164/2012, PN-II-IDPCE-2011-3-0187]
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Polyurethane-extracellular matrix bionanocomposites containing in situ generated silver nanoparticles and biocompatible polymers such as hydrolyzed collagen, elastin, hyaluronic acid or chondroitin sulfate, were obtained by solvent casting method in order to achieve improved antibacterial biomaterials for medical devices. Using thermal analyses the stabilizing effect of polymeric components on the incorporated silver nanoparticles (metallic silver and/or silver in oxidized state) was evidenced. The non-isothermal kinetic parameters of the thermal degradation of studied bionanocomposites are evaluated in terms of integral methods. The variation of kinetic parameters in function of conversion was determined. By means of FIR spectroscopy analysis the hydrolytic stability in PBS solutions (pH 4.6 and 7.4) of the studied silver bionanocomposites was investigated. It was found that the hydrolytic degradation occurred at the ester and urethane bonds in the poly(ester urethanes). The incorporated extracellular matrix components increased the hydrophilicity and favoured the hydrolysis. During hydrolysis increased hydrogen bonding and crystallinity principally for AgNPs stabilized polyurethane matrices which indicate a chemicrystallization effect. (C) 2015 Elsevier Ltd. All rights reserved.
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