Radiation grafting of methyl methacrylate monomer on natural rubber latex. [Gamma radiation]

Journal Article · Tue May 01 04:00:00 EDT 1984 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1984.070290505· OSTI ID:6593969

Sundardi, F; Kadariah, S

A method of radiation grafting of methyl methacrylate (MMA) monomer on natural rubber (NR) latex has been studied. The irradiation dose in radiation emulsion polymerization of MMA monomer was lower compared to the irradiation dose for grafting of MMA monomer on NR latex, in order to obtain the same degree of conversion. This is due to the size of the rubber particles which are quite large and, hence, not sufficient to ensure an ideal emulsion polymerization. The irradiation dose for radiation grafting of MMA monomer on latex was around 300 krad to obtain a 75% degree of conversion. However, this irradiation dose was lower compared to the irradiation dose for bulk polymerization of MMA momomer, in order to obtain the same degree of conversion. This is due to the gel effect in the viscous media. Radiation grafting of MMA monomer on NR latex does not influence the pH of the latex, but influences the viscosity significantly. The viscosity of the NR latex increased with an increase in irradiation dose, due to the increase of the total solid content in the latex. The MMA monomer converted to P-MMA in NR latex was largely grafted on the NR, or at least insoluble in a solvent for P-MMA, such as acetone or toluene. The hardness of the pure gum vulcanizate increased with an increase in the degree of grafting or P-MMA content, but the other physical properties, such as tensile strength, modulus, elongation at break, and thermal stability, were not greatly influenced by the degree of grafting. 9 references, 3 figures, 5 tables.

• Research Organization: Centre for the Application of Isotopes and Radiation, Jakarta Selatan, Indonesia
• OSTI ID: 6593969
• Journal Information: J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 29:5; ISSN JAPNA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
CARBOXYLIC ACID ESTERS
CHEMICAL PREPARATION
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DOSE RATES
ELASTOMERS
ELECTROMAGNETIC RADIATION
ESTERS
EXPERIMENTAL DATA
GAMMA RADIATION
GRAFT POLYMERS
INFORMATION
IONIZING RADIATIONS
METHACRYLIC ACID ESTERS
METHYL METHACRYLATE
NATURAL RUBBER
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PMMA
POLYACRYLATES
POLYMERIZATION
POLYMERS
POLYVINYLS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RUBBERS
SYNTHESIS
VISCOSITY