Radiation degradation of polystyrene/poly(methyl methacrylate) blends. [Gamma radiation]
Although copolymers of styrene(PS) and methyl methylacrylate(PMMA) showed slightly higher flexural strengths than the homopolymers, blends showed markedly lower strengths, the decrease being greatest at ca 50% styrene. There was a decrease in modulus, but an increase in the elongation to break attributable to the two-phase morphology. The effect of various radiation doses on flexural strength is demonstrated. The decreases in strength reflect decreases in fracture strain, only a small change in modulus being observed. The compressive strength showed similar relationships with composition and dose. The dose dependence of the flexural strength was approximately exponential, and degradation rates could be calculated. The observed relationship between the rates of radiation-induced degradation of PS/PMMA blends, measured by the decrease in flexural strength, or from the initial rates of degradation and the compositions of the blends, is illustrated. 3 figures.
- Research Organization:
- Queensland Univ., Brisbane, Australia
- OSTI ID:
- 5371791
- Journal Information:
- J. Appl. Polym. Sci.; (United States), Vol. 24:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPOLYMERS
DECOMPOSITION
PMMA
CHEMICAL RADIATION EFFECTS
STYRENE
CHEMICAL REACTION YIELD
COMPRESSIBILITY
FLEXURAL STRENGTH
GAMMA RADIATION
MIXTURES
MORPHOLOGY
QUANTITY RATIO
RADIATION DOSES
AROMATICS
CHEMICAL REACTIONS
CHEMISTRY
DISPERSIONS
DOSES
ELECTROMAGNETIC RADIATION
ESTERS
HYDROCARBONS
IONIZING RADIATIONS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYACRYLATES
POLYMERS
POLYVINYLS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
YIELDS
400600* - Radiation Chemistry