MELT VISCOELASTICITY OF NOVEL GLASSY PHOSPHATE POLYMERS

摘要

The melt viscoelasticity of two glassy phosphate polymers (GPPs) were studied under oscillatory shear flows to accelerate efforts to melt process them with organic polymers. The melt viscosity was time-independent near the glass-transition temperature and it increased monotonically with time at higher temperatures. The viscosity increase was exponential at long times, and the transition time to the exponential dependence was strongly dependent on the shear strain. The results were consistent with the Hookean dumbbell model and melt viscosity-average molecular weight was estimated from a modified Rouse theory, making it possible to quantitatively assess melt processibility of the GPPs.