Hydrogel coating of RVNRL film by electron-beam irradiation

Abstract

The tackiness properties of radiation-vulcanized natural rubber latex (RVNRL) film surfaces coated by various monomers were investigated in order to define the suitable hydrogels which reduce the tackiness of the film. In this context, different types of monomers, namely, N-vinyl-2-pyrrolidone (NVP), N,N-dimethylaminoethylamide (DMAEA), acrylic acid (AAc), n-butyl acrylate (n-BA), and 2-hydroxyethyl methacrylate (HEMA) as well as the monomer mixtures were tried with varying degrees of success. Coating the RVNRL film with 80% HEMA/20% n-BA by irradiation at 80 kGy using a low-energy electron beam gave a remarkable reduction in the surface tackiness of the RVNRL film. Several other attempts were made such as priming the RVNRL film with acid and aluminum sulfate prior to coating, mixing the aluminum sulfate into the monomer mixtures, and dipping the partially wet RVNRL film into the monomer to enhance the wettability of the monomers with the film. The photomicrographs taken illustrate that the decrease in tackiness with the coating is due to the increase of the surface roughness at an 80-kGy irradiation dose. The studies also revealed that the reduction in the contact angle and the increase in water absorption of the RVNRL film after irradiation are due to the formation of the hydrogel layer.

Electron‐beam irradiation of poly(vinyl chloride)/epoxidized natural rubber blends in presence of trimethylolpropane triacrylate

“…There have been extensive studies concerning the irradiation of pure polymers. We reported the irradiation processing of polymers and some of our findings on surgical rubber gloves,12 poly(vinyl chloride) (PVC),13 polypropylene,14, 15 and hydrogel coatings 16, 17…”

Irradiation Crosslinking of PVC/ENR Blend: A Comparative Study with the Respective Homopolymers

“…[5] Extensive studies concerning the irradiation of pure polymers have been reported. [10,11] The blending of polymers for property enhancement or for economic purposes has become increasing important in the last decade. [10,11] The blending of polymers for property enhancement or for economic purposes has become increasing important in the last decade.…”

Characterization of electron beam irradiated natural rubber/modified starch composites

“…The development of these fracture patterns is attributed to degradation associated with irradiation. The blend sample irradiated at 50 kGy showed a more regular surface, with no cracks observed, implying a degree of crosslinking sufficient to resist crack propagation [29,30].…”