Original scientific paper
The effect of Ca/Zn stabilizers on the thermooxidative degradation poly(vinyl chloride) /chlorinated polyethylene blends
Nataša STIPANELOV VRANDEČIĆ
orcid.org/0000-0003-0464-9133
; University of Split, Faculty of chemistry and Technology, Split
Ivka KLARIĆ
; University of Split, Faculty of chemistry and Technology, Split
Tonka KOVAČIĆ
; University of Split, Faculty of chemistry and Technology, Split
Abstract
The thermooxidative degradation of blends of poly(vinyl chloride) (PVC) and polymeric modifier chlorinated polyethylene (CPE) was investigated by means of differential scanning calorimetry (DSC) and thermogravimetry (TG) under dynamic and isothermal conditions. The immiscibility of PVC and CPE (chlorine content 42 %) was established for all the investigated compositions of the blends. The thermooxidative degradation of PVC/CPE blends in temperature range of 50 – 650 ºC occurs in two basic degradation steps. In the first, up to 400 ºC, the main degradation reactions are dehydrochlorination of PVC and CPE, but the rates and mechanisms of the polymer degradation are significantly different. The influence of Ca/Zn carboxylates with different Ca/Zn ratios, on thermooxidative stability of the blends components was also investigated. Ca/Zn carboxylates stabilize PVC by changing its degradation rate and mechanism, but, at the same time, these stabilizers influence the degradation of the polymeric modifier CPE.
Keywords
Ca/Zn carboxylates; PVC/CPE blends; thermooxidative stability
Hrčak ID:
1547
URI
Publication date:
20.2.2006.
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