Melt Viscoelasticity of Novel Glassy Phosphate Polymers

J. U. Otaigbe and R. L. Sammler

Dept. of Materials Science and Engineering

Iowa State University,

Ames, IA, USA

Annual Technical Conference - Society of Plastics Engineers

Abstract

The melt viscoelasticity of two glassy phosphate polymers (GPPs) were studied under oscillatory shear flows to accelerate efforts to melt process them with org. polymers. The melt viscosity was time-independent near the glass-transition temp. and it increased monotonically with time at higher temps. 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-av. mol. wt. was estd. from a modified Rouse theory, making it possible to quant. assess melt processibility of the GPPs.