Densification effect on physical properties of atactic polystyrene

Abstract

Atactic polystyrene has been densified under hydrostatic pressure, up to 2 kbar, at about 180°C. Dielectric measurements were made on densified and nondensified polystyrene samples by using the thermally stimulated depolarization current (TSDC) and the absorption and resorption current methods. The dielectric loss is modified by the densification. This effect can be explained in terms of the free‐volume reduction and the internal stress induced in the material during densification.

Isotropic Pressure-Densified Atactic Poly(methyl methacrylate) Glasses: Free-Volume Properties from Equation-of-State Data and Positron Annihilation Lifetime Spectroscopy

“…. The observed depression of T g with P d and the volume relaxation below T g are in good agreement with previous reports on pressuredensified PMMA 13,21,24,28 as well as PS 10,13,23,24,28,29,40 and PVAc. 11 The features observed in Figure 5 4 and 2, respectively.…”

“…Limited data are available on pressure-densified polystyrene (PS) from a solvent sorption and gas permeation study 23 as well as from thermally stimulated depolarization current (TSDC) measurements. 40 More recently, there have been a number of reports on pressure-densified polymer glasses that have been investigated with quasi-elastic Raman scattering, 42 laser light scattering, 31 small-angle X-ray scattering study of density fluctuation, 33,43,44 and Rayleigh-Brillouin light scattering measurements. 45 The polymers that have been studied most extensively with respect to pressure densification are a-PMMA, 13,14,18,21,24,25,27,28,36,38,39,43 a-PS, 10,13,14,16,17,19,20,[22][23][24][25][28][29][30][31]33,34,40,41,[43][44][45] PVAc, 11,15,39,43,…”

Structural, electrical and magnetic properties of polystyrene films filled with AgNO3–FeCl3 mixed fillers

“…Among such materials PS which is a preferred material because it has good stiffness, optical, electrical and mechanical properties [1,2]. In addition PS is a non-polar, low loss polymer and hence has desirable electronic properties for use in the field of insulating materials [3,4].…”

Effect of AgNO3–MnCl2 mixed fillers on the physical properties of polystyrene films

“…Moreover, PS has been chosen as a polymeric matrix because of its dielectric and mechanical properties and its low cost. During the past decades, numerous studies have been published on the physical properties of PS and its blends with other polymers 1–5…”