Thermal degradation of foamed polystyrene

Thermal degradation of foamed polystyrene

The thermal degradation of foamed polystyrene patterns in the expendable pattern casting (EPC) process has been studied. Various physical transitions that may occur during the degradation of the polymer have been determined with scanning electron microscopy, differential scanning calorimetry and the...

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Veröffentlicht in:Journal of materials science 1995-06, Vol.30 (11), p.2944-2949
Hauptverfasser: MEHTA, S, BIEDERMAN, S, SHIVKUMAR, S
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Sprache:eng
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Applied sciences
Cellular
Exact sciences and technology
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
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container_end_page 2949
container_issue 11
container_start_page 2944
container_title Journal of materials science
container_volume 30
creator MEHTA, S
BIEDERMAN, S
SHIVKUMAR, S
description The thermal degradation of foamed polystyrene patterns in the expendable pattern casting (EPC) process has been studied. Various physical transitions that may occur during the degradation of the polymer have been determined with scanning electron microscopy, differential scanning calorimetry and thermogravimetric analysis. The effects of polymer density and bead structure on the degradation characteristics have been investigated. The results indicate that, when exposed to elevated temperatures, the polymer beads collapse at about 110-120 deg C. The collapsed beads melt at 160 deg C, and start to vaporize at temperatures greater than about 275 deg C. Complete volatilization occurs in the temperature range 460-500 deg C. The heat of degradation of expanded polystyrene has been estimated to be at the order of 912 J g exp -1 .
doi_str_mv 10.1007/BF00349667
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subjects Applied sciences
Cellular
Exact sciences and technology
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
title Thermal degradation of foamed polystyrene
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