Viscoelastic and structural properties of a phenyl-modified polysiloxane system with a three-dimensional structure.

摘要: The relationships between the viscoelastic and structural properties of glass-forming materials with polysiloxane bonds, which serve as network formers, phenyl groups, act terminators, are examined based on shear viscoelasticity, 29Si MAS NMR, GPC measurements during early stages network-forming process. viscosities present samples do not depend frequency at temperatures up to 200 °C, suggesting that origin viscous flow does include intermolecular entanglement. According results strain dependence elastic modulus, bridging-oxygen number, molecular weight, system has a complex structure, or distribution various-sized molecules composed various dimensionalities, furthermore an elementary process viscosity is simple these molecules. factors determine its temperature categorized into t...