THE EFFECTS OF $gamma$-IRRADIATION ON POLY-METHYL METHACRYLATE

Journal Article · Thu Jun 01 04:00:00 EDT 1961 · J. Appl. Phys. (Japan)

OSTI ID:4803897

Kishi, N; Kamata, K

Radiation effects on the decrease in the molecular weight of stressed and unstressed polymethyl methacrylate was the same for both. The mechanical properties of PMMA depreciated rapidly when the irradiation dosage exceeded 3 x 10/sup 6/ r and the degree of polymerization fell below 1500. The glass transition temperature, T, of irradiated PMMA decreased with increasing dosage. The relationship between T/sub g/ and the molecular weight, M/sub v/ can be expressed as 1/T/sub g/ = 2.85 x 10/sup -3/ + 0.333 x 10/sup 1/ x 1/M/sub v/ (1/ K). The G-value for the main chain fracture of samples irradiated in a vacuum and in air was about 2.1. PMMA irradiated with a dosage of 10/sup 7/-- 10/sup 8/ r became swollen with bubbles when heated even after 2 yr and 2 mo of storage at room temperature. The swelling seemed to be attributed to the generation of gas, not only during irradiation but also during heating. (OID)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-033537
• OSTI ID: 4803897
• Journal Information: J. Appl. Phys. (Japan), Journal Name: J. Appl. Phys. (Japan) Vol. Vol: 30
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
BUBBLES
EQUATIONS
EXPANSION
GAMMA RADIATION
GASES
HEATING
IRRADIATION
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
METHACRYLATES
METHYL RADICALS
MOLECULES
POLYMERIZATION
POLYMERS
RADIATION CHEMISTRY
RADIATION DOSES
RADIATION EFFECTS
REACTION KINETICS
STRESSES
TEMPERATURE
TRANSITION TEMPERATURE
VACUUM
WEIGHT