Composites of a terpolymer (46mol% L-lactic acid, 38mol% glycolic acid, 16mol% trimethylene carbonate) and TiO2 nanoparticles (0-2w%) are obtained from sonicated dispersions in dichloromethane followed by solvent evaporation. All samples display a glass transition at a temperature close to body temperature; Tg of composites is slightly higher than that of the matrix polymer, indicating a degree of polymer-nanoparticle interaction. The addition of TiO2 nanoparticles improves the mechanical properties of the polymer (tensile modulus and tensile strength increase) and enhances both the free recovery (from 92% to 100% with 1.92w% of TiO2) and the constrained recovery in the presence of an opposing force (from 7% to 34 % with 1.92w% of TiO2).
SHAPE-MEMORY POLYMERS REINFORCED WITH INORGANIC NANOPARTICLES / E.Zini; P. Dobrzynski; M. Scandola. - STAMPA. - (2009), pp. 4.111-4.112. (Intervento presentato al convegno XIX Convegno Italiano di Scienza e Tecnologia delle Macromolecole tenutosi a Milano nel 13-17 settembre 2009).
SHAPE-MEMORY POLYMERS REINFORCED WITH INORGANIC NANOPARTICLES
ZINI, ELISA;SCANDOLA, MARIASTELLA
2009
Abstract
Composites of a terpolymer (46mol% L-lactic acid, 38mol% glycolic acid, 16mol% trimethylene carbonate) and TiO2 nanoparticles (0-2w%) are obtained from sonicated dispersions in dichloromethane followed by solvent evaporation. All samples display a glass transition at a temperature close to body temperature; Tg of composites is slightly higher than that of the matrix polymer, indicating a degree of polymer-nanoparticle interaction. The addition of TiO2 nanoparticles improves the mechanical properties of the polymer (tensile modulus and tensile strength increase) and enhances both the free recovery (from 92% to 100% with 1.92w% of TiO2) and the constrained recovery in the presence of an opposing force (from 7% to 34 % with 1.92w% of TiO2).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
