Rheological behavior of thermoset/thermoplastic blends during isothermal curing: Experiments and modeling

摘要: Abstract The evolution of the viscoelastic properties a molten thermoplastic/thermoset system during course isothermal polymerization thermoset precursors has been investigated and modeled. Such systems are initially homogenous phase separate upon monomers. In present study, atactic polystyrene (85 60 wt%) is blended to stoichiometric mixture diglycidyl ether bisphenol A with 4,4′-methylenebis(2,6-diethylaniline). During polymerization, becomes thermoplastic-rich matrix an epoxy-rich dispersed appears. Both phases experience changes in their composition properties. rheokinetic model proposed take into account four contributions behavior: progressive deplastification involving modification glass transition thus free volume, dilution network entanglements by non yet converted low molar weight molecules, emulsion behavior after separation finally interparticular interactions being assimilated mechanical percolation. Provided that temperature dynamic moduli neat components known, time can be predicted no ad hoc parameter calculations good agreement experimental data.