Preparation and characterization of poly(methyl methacrylate)--lead silicate composites. [Gamma radiation]

Journal Article · Sun Jul 15 00:00:00 EDT 1979 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1979.070240210· OSTI ID:6104926

Rabie, A M ^[1]; Moustafa, A B; Badran, A S

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1. Ain Shams Univ., Cairo, Egypt

Poly(methyl methacrylate)--lead silicate composites were prepared with different amounts of crystalline or amorphous PbO--SiO/sub 2/ binary composition (70 mole % PbO). The polymerization reaction was carried out in aqueous medium and in methanol--water mixture at 40/sup 0/C using sodium bisulfite as initiator. The presence of lead silicate was found to increase the molecular weight of the poly(methyl methacrylate). The prepared composites were characterized by studying their shielding properties to ..gamma.. radiation, mechanical hardness, dielectric constant, and thermal stability. It was found that lead silicate increases the absorbing power of the composites to ..gamma.. radiation. This behavior was found to be dependent on the amount and the type of lead silicate (amorphous or crystalline). Gamma irradiation of the composites was found to cause chemical degradation of the poly(methyl methacrylate) leading to a decrease in mechanical hardness. Molecular weights of the poly(methyl methacrylate) for some of the composites were determined before and after irradiation viscosimetrically. Dielectric constants for some of the composites were determined at two different temperatures. The thermal stability of the composites was studied by means of an automatic thermogravimetric analyzer. 2 figures, 5 tables.

• OSTI ID: 6104926
• Journal Information: J. Appl. Polym. Sci.; (United States), Vol. 24:2
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
LEAD SILICATES
CHEMICAL RADIATION EFFECTS
METHYL METHACRYLATE
COMPOSITE MATERIALS
DIELECTRIC PROPERTIES
GAMMA RADIATION
LEAD OXIDES
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
METHANOL
POLYMERIZATION
SODIUM COMPOUNDS
WATER
ALCOHOLS
ALKALI METAL COMPOUNDS
CARBOXYLIC ACID ESTERS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ESTERS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
IONIZING RADIATIONS
LEAD COMPOUNDS
METHACRYLIC ACID ESTERS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SILICATES
SILICON COMPOUNDS
400600* - Radiation Chemistry