Abstract
Ultraviolet induced cross-linking of low density polyethylene/ethylene vinyl acetate melt mixed blends were explored in presence of trimethylolpropane trimethacrylate (TMPTMA) and benzophenone (BP) as cross-linking agent and photoinitiator respectively. On the basis of gel content, it was found that 1 wt-%TMPTMA, 1 wt-%BP and irradiation time of 100 s represent the optimum parameters for photocross-linking of this system. Infrared spectroscopy was also used to follow the cross-linking reactions. Differential scanning calorimetry analysis showed that the heat of fusion reduces upon cross-linking development in the system, implying that crystallisability of the samples is suppressed with increasing cross-link bonds. Thermal stability of samples as a function of irradiation time goes through a maximum and then diminishes. Mechanical examinations in tensile mode proved that elongation at break of neat and blended specimens drops significantly with increasing degree of cross-linking, while variations of Young's modulus of the blends show a composition dependent behaviour in which crystallisability of the samples is a major determinant.
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