Study on the Properties of Blend Rubber Between Grafted Rubber Latex and Natural Rubber Latex by Gamma Radiation

Abstract

Blend rubber films were prepared by mixing styrene grafted rubber latex and natural rubber latex (NRL) with varying proportions by gamma radiation from Co-60 source at room temperature. Tensile strength, modulus at 500% elongation, elongation at break, permanent set, and swelling ratio were measured. Tensile strength and modulus at 500% elongation attain maximum at 8 kGy radiation dose for blend rubber films. The increase in tensile strength is insignificant, but modulus increases from 5.61 to 7.46 MPa with increased proportion of grafted rubber latex from 40 to 70% in the blend at this radiation dose. Elongation at break, permanent set, and swelling ratio of blend rubber decreases with increase in radiation dose as well as proportion of grafted rubber.

Addition of Transition Metals to Improve Physico-Mechanical Properties of Radiation-Vulcanized Natural Rubber Latex Films

“…The radiation vulcanization accelerator n-BA (Kanto Chemical Co. Inc., Japan), stabilized with ammonium laurate, was mixed properly with a magnetic stirrer for 1 h while adding the accelerator to the latex dropwise to reduce radiation doses. [1] The latex was then irradiated at different radiation doses such as 5,8,12,15, and 20 kGy by gamma rays from a radiation source of Co-60 (dose rate, 5 kGy=h). The NR latex was cast on raised-rimmed glass plates of dimension 17 Â 11 cm 2 and allowed to dry in air at room temperature until it was transparent.…”

“…The treatment of latex at maturation time can improve the physicochemical properties of NR latex films, as reported by Dafader et al [4] They also improve the tensile strength of rubber films by blending between irradiated and nonirradiated rubber latices with a low radiation dose. [5] Some work has been done to enhance the degree of vulcanization of NR by using additives other than sensitizers. The mechanical properties of silica-filled epoxidized NR vulcanization have been enhanced by the addition of multifunctional additives like diamine salt of fatty acid.…”

Effect of Manganese on Radiation Vulcanization of Natural Rubber

“…[3] The properties of NR can be improved by vulcanization, the most studied method. [5,6] Not many reports can be found in the literature on how to enhance the degree of vulcanization of NR by using additives other than sensitizers. [1] Further improvement has been achieved by lowering required radiation doses through the invention of sensitizers.…”