Accession Number:

ADA093532

Title:

Characterization by Tin-Specific Size Exclusion Chromatography of the Free Radical Copolymerization of Tributyltin Methacrylate and Methyl Methacrylate,

Descriptive Note:

Corporate Author:

NATIONAL BUREAU OF STANDARDS WASHINGTON DC CHEMICAL STABILITY AND CORROSION DIV

Report Date:

1980-12-11

Pagination or Media Count:

20.0

Abstract:

Copolymers of tributyltin methacrylate TBTM and methyl methacrylate MMA comprise an important class of biocidal slow-release organotin polymers OMPs. Little is known of the kinetics and mechanism of copolymerization. TBTM and MMA were copolymerized in the presence of a free radical initiator benzoyl peroxide at 80.1 deg. C. Aliquots, taken at preselected intervals from 0 to 1440 min, were fractionated by size exclusion chromatography SEC coupled with ultraviolet UV and tin-specific graphite furnace atomic absorption GFAA detectors, A UV absorbance observed at 254 nm was associated with low molecular weight MW species, decreasing in concentration continuously with time of reaction. Tin-specific GFAA indicated a decrease in low MW species c. 350 daltons with concurrent increases in high MW species c. 40,000 daltons. The fraction of high MW increased as a linear function of the logarithm of the time of reaction. SEC-UV-GFAA thus provides a tool of major importance for characterizing the time dependence and continuity of the process by which monomers of TBTM are converted to a useful bioactive slow-release coating material. Author

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE