An evaluation of the pressure-dependent melt viscosity of polyphenylsulfone

Abstract

A method for the determination of pressure‐affected viscosity from capillary rheometry and pressure–volume–temperature (PVT) data was tested on polyphenylsulfone melt. Shear viscosity data evaluated at selected temperatures (345–375°C) were interlinked to the PVT data at pressures ranging from 1 to 200 MPa. According to the recently proposed correlation approach, a pressure‐dependent shear viscosity is derived from the relationship (verified on several commodity polymers) between temperature‐dependent viscosity and a free volume parameter computed using the Simha–Somcynsky equation of state. Finally, the predicted pressure‐viscosity coefficient was compared with the value obtained experimentally on a modified single piston rheometer. POLYM. ENG. SCI., 54:711–715, 2014. © 2013 Society of Plastics Engineers

Experimental Evaluation of Polyphenylsulfone (PPSF) Powders as Fire-Retardant Materials for Processing by Selective Laser Sintering

“…These irregular shapes of the particles caused by poor cryogenic grinding will hinder the flowability of the powder on the build platform of the laser sintering test bed. In addition, the varying sizes can cause problems to the consolidation of layers based on the heat input from a fast-moving laser energy [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ].…”

“…The geometrical parameters were measured based on the SEM images, which indicate the original radius, sintered radius, and distance from the centre to the sintering plane of two adjacent particles. Additionally, other properties such as surface tension and viscosity were related to the time (t) of sintering as well, using the information reported by Sedlacek et al and Mohan [ 32 , 33 ]. The classical sintering equation proposed by Frankel is only suitable for a 2D simplification.…”

“…These irregular shapes of the particles caused by poor cryogenic grinding will hinder the flowability of the powder on the build platform of the laser sintering test bed. In addition, the varying sizes can cause problems to the consolidation of layers based on the heat input from a fast-moving laser energy [28][29][30][31][32][33][34][35]. Differential scanning calorimetry (DSC) is used to measure the heat into or out of the test polymer powder, generating a thermal profile that can be used for establishing the sintering window of these powder materials, before undertaking the laser sintering trials.…”

Dependence of rheological behaviors of polymeric composites on the morphological structure of carbonaceous nanoparticles

“…The connectivity between nanoparticles and polymer molecules determines largely the macroscopic properties of their composites. A successful polymeric processing requires a thorough insight of their viscoelastic behavior which is significantly dependent on the additives concentration, distribution state, particle size, temperature, and pressure, etc . For polymeric melts, their strong melt strength and high viscosity cause a much more difficult dispersion of nanoparticles than that in polymeric solutions.…”