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The crosslinking process of PE and EVA with different concentrations of a crosslinking agent (CA) has been studied. The extent of the crosslinking has been evaluated by gel fraction and density measurements. The different transitions involved in the thermal processing and decomposition have been studied by DSC and TGA and compared for all the mixtures prepared. Mechanistic pseudo-kinetic models have...
Mixtures of commercial EVA and different concentration of PE have been prepared and the heat evolution during two successive heating experiments has been studied by means of differential scanning calorimetry (DSC). A kinetic model has been suggested and applied, involving the different intrinsic fractions susceptible of undergoing transitions during the experiment, and also the concentration of PE...
Six samples of commercial ethylene-vinyl acetate (EVA) copolymers with different vinyl acetate (VA) contents have been pyrolyzed with and without an MCM-41 acid catalyst in a TG equipment at 10 and 40K/min and inert atmosphere (N 2 ). The classical shift to higher temperatures has been observed for all processes involved when increasing the heating rate, being the peak corresponding to the...
The transitions and reactions involved in the thermal treatment of polyethylene (PE) and EVA at a heating rate of 10 o Cmin -1 in an inert atmosphere (N 2 ), have been studied by differential scanning calorimetry (DSC).A brief discussion on the methodology related to the mathematical treatment of the DSC data is presented. The physical meaning of the kinetic parameters...
The influence of the type of plasticizer and its concentration on the rheological behaviour of plastisols made from several commercial resins during the gelation and fusion processes has been studied. The use of different concentrations of plasticizers as well as plasticizers with different compatibilities has allowed the observation of relevant differences in the behaviour of the elastic and viscous...
In this paper the possibility of recycling the PVC resulting from the rotational moulding of plastisols is studied. Parts of processed PVC were ground with liquid nitrogen into four fractions of different sizes which were added to a plastisol at different concentrations. A study of the influence of the amount and size of the recycled PVC in the viscosity of the plastisol and in the gelation and...
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