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DEFORMATION BEHAVIOR OF NANO/MICRO REINFORCED PMMA
 Recman, Lukáš ; Nezbedová, Eva (oponent) ; Kučera, Jaroslav (oponent) ; Jančář, Josef (vedoucí práce)
The effect of particle size on magnitude of modulus and the post-yield response is highlighted. It is shown that both regions show a pronounced particle size dependence. The object of this work is to correlate a number of experimental facts and theoretical considerations regarding the mechanism of elastic and plastic deformation of amorphous polymers in general and of glassy PMMA particularly. Deformation behavior of PMMA filled with spherical particles will be observed in elastic and plastic region. The effect of particle size dependence on the modulus and strain hardening response was observed. The interpretation of reinforcing effect in nanocomposites is building up with the concept of immobilization, the nanoparticles show significant affect on the molecular dynamics and the kinetics of the disentanglement. While for the modulus measurement a large extent of data were published trying to interpret the observed trends, the strain-hardening region is somehow omitted. In an elastic region, the structure of the material maintains the same as prepared, but after passing the yield point, the primary structure is destroyed. It is shown that incorporation of the nanoparticles yields to the increase of strain hardening slope and that this slope is in a good correlation with Guth-Gold equation. It is assumed that the particles can serve as physical crosslinks yielding to physically denser entangled network.
Úplný záznam
DEFORMATION BEHAVIOR OF NANO/MICRO REINFORCED PMMA
 Recman, Lukáš ; Nezbedová, Eva (oponent) ; Kučera, Jaroslav (oponent) ; Jančář, Josef (vedoucí práce)
The effect of particle size on magnitude of modulus and the post-yield response is highlighted. It is shown that both regions show a pronounced particle size dependence. The object of this work is to correlate a number of experimental facts and theoretical considerations regarding the mechanism of elastic and plastic deformation of amorphous polymers in general and of glassy PMMA particularly. Deformation behavior of PMMA filled with spherical particles will be observed in elastic and plastic region. The effect of particle size dependence on the modulus and strain hardening response was observed. The interpretation of reinforcing effect in nanocomposites is building up with the concept of immobilization, the nanoparticles show significant affect on the molecular dynamics and the kinetics of the disentanglement. While for the modulus measurement a large extent of data were published trying to interpret the observed trends, the strain-hardening region is somehow omitted. In an elastic region, the structure of the material maintains the same as prepared, but after passing the yield point, the primary structure is destroyed. It is shown that incorporation of the nanoparticles yields to the increase of strain hardening slope and that this slope is in a good correlation with Guth-Gold equation. It is assumed that the particles can serve as physical crosslinks yielding to physically denser entangled network.
Úplný záznam

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