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TRACER TECHNIQUES FOR THE DETERMINATION OF MONOMER REACTIVITY RATIOS. I. A DIRECT COUNTING TECHNIQUE APPLIED TO THE STYRENE-METHACRYLATE COPOLYMERIZATION

Journal Article · · J. Polymer Sci.
;
A direct counting technique was evaluated and used for the determination of monomer reactivity ratios. Windowless gas-flow counting of polymer samples plated directly on planchets gave reproducible counting rates and nearly linear self-absorption curves in the 8 to 25 mg/planchet range. Copolymer composition data obtained by radioactivity assay on a series of styrene C/sup 14//methyl methacrylate copolymers gave monomer reactivity ratios of r/sub 1/ = 0.48, r/sub 2/ = 0.46 at 60 deg and r/sub 1/ = 0.60, r/sub 2/ = 0.55 at 132 deg . These values are in good agreement with literature values. (auth)
Research Organization:
Univ. of Louisville, Ky.
NSA Number:
NSA-14-011562
OSTI ID:
4149782
Journal Information:
J. Polymer Sci., Journal Name: J. Polymer Sci. Vol. Vol: 42
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ABSORPTION
CARBON 14
CHEMISTRY
COUNTERS
DIAGRAMS
LABELLED COMPOUNDS
METHACRYLIC ACID
POLYMERIZATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
RADIOACTIVITY
REACTIVITY
STYRENE
TRACER TECHNIQUES