Abstract
The recoverable strain and the deformation of dispersed rubber particles of ABS were examined by means of an extensional rheometer designed for investigations of the elongational viscosity. The recoverable strain εR strongly depends on the stretching temperature and the applied strain rate as well as the total strain. With decreasing temperature, or with increasing strain rate, the εR seems to approach a constant level which is equal to the total strain. Time-temperature superposition can be applied to the strain rate dependence curves of εR at constant total strains measured at different temperatures. The shift factor ear agrees well with the values calculated by the WLF equation, log aT=-8.86(T-137)/(101.6+T-137). The deformation of rubber particles is closely related with εR. And its dependency on the total strain, temperature and strain rate is the same in the case of εR. The modulus of rubber particles obtained by σ=G (λ2-1/λ) were about twice of the rubbery plateau moduli of the ABS sample.
