Preparation of low-density polyethylene composites by UV irradiation

Felisberti, Maria I.; Giesse, Ralf; Paoli, Marco

doi:10.1007/bf00254226

Cited by 3 publications

(1 citation statement)

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“…4,37 Although, UV photocross-linking has drawn much interest in the field of polymer modification, to the best of our knowledge, no attempt has yet been made on UV photocross-linking of LDPE/EVA blends while it is satisfactorily efficient for some homopolymers such as poly(vinyl chloride) and PE. 4,12,44,45 In the current study, the authors aim to focus on the UV irradiation treatment of LDPE/EVA blends in terms of gel content through optimising the process conditions and then investigate the subsequent effects on the mechanical and thermal properties in particular in comparison with those of the constituents and the nonradiated blends.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterisation of UV irradiation cross-linked LDPE/EVA blends

Shamekhi

Jafari

Khonakdar

et al. 2010

Plastics, Rubber and Composites

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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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