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- W2134708439 abstract "Cast film composites have been prepared from aqueous polymer solutions containing nanometric silica particles. The polymers were polyvinyl alcohol (PVA), hydroxypropylmethylcellulose (HPMC) and a blend of PVA-HPMC polymers. In the aqueous dispersions, the polymer-silica interactions were studied through adsorption isotherms. These experiments indicated that HPMC has a high affinity for silica sur- faces, and can adsorb at high coverage; conversely, low affinity and low coverage were found in the case of PVA. In the films, the organization of silica particles was investi- gated through transmission electron microscopy (TEM) and small-angle neutron scat- tering (SANS). Both methods showed that the silica particles were well-dispersed in the HPMC films and aggregated in the PVA films. The mechanical properties of the composite films were evaluated using tensile strength measurements. Both polymers were solid materials, with a high-elastic modulus (65 MPa for HPMC and 291 for PVA) and a low-maximum elongation at break (0.15 mm for HPMC and 4.12 mm for PVA). In HPMC films, the presence of silica particles led to an increase in the modu- lus and a decrease in the stress at break. In PVA films, the modulus decreased but the stress at break increased upon adding silica. Accordingly, the polymer/silica inter- action can be used to tune the mechanical properties of such composite films. V" @default.
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- W2134708439 date "2006-01-01" @default.
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- W2134708439 title "Relationship between the polymer/silica interaction and properties of silica composite materials" @default.
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- W2134708439 doi "https://doi.org/10.1002/polb.20768" @default.
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