Thermal oxidation of thermoplastics

Abstract

SynopsisCommercial thermoplastics may be classified by the types of rate curves obtained on thermal oxidation. The rate of oxidation of an acrylonitrile-butadiene-st.yrene plastic is affected by sample thickness and appears to be diffusion-controlled. Pigmentation increases the reaction rate of this compound in all the cases studied because of the catalytic effect of the metals present.. Carbon black adversely affects the oxidation rate of stabilized polypropylene. The acetal plastics decompose under oxidative conditions at 140°C. Of the thermoplastics examined, polytetrafliioroethylene, fluorinated ethylenepropylene copolymer, poly(viny1idene flnoride), poly(ethy1ene terephthalate), and polysulfone are the most resistant to thermal oxidation at 140°C.

Review on the thermo-oxidative degradation of polymers during processing and in service

“…-In service life degradation It was shown that at oven ageing conditions PC reacts with oxygen although the rates are small [153,154]. The degradation of bisphenol A polycarbonate (PC) in air at 300 °C cause random scission of the polymeric chains.…”

Oxygen uptake by isotactic polypropylene of different morphological structure

“…At higher temperanares the oxygen uptake reaction leading to polymer oxidation shows different behaviour (14). The initial slopes of dV/dt versus (l-X) for 130 ~ and 140 ~ are shown in Figure 4.…”

Solid Freeform Fabrication Proceedings -1999

“…(4) due to the exponential nature of t". The second factor is related to the degradation of ABS by molecular chain breaking, oxidation, and butadiene particle coelescence at the high temperatures used during FD extrusion (Casale et al, 1975;Kelleher, 1966). This temperature related degradation is being confirmed via comparison of the molecular weights and microstructures (i.e., the butadiene particle size distribution) of the bulk ABS with extruded FD-ABS.…”