scholarly journals Detailed copolymer characterization using ultraviolet spectroscopy

1985 ◽  
Vol 63 (1) ◽  
pp. 253-263 ◽  
Author(s):  
L. H. Garcia-Rubio ◽  
N. Ro
Keyword(s):  
Methyl Methacrylate ◽  
Statistical Estimation ◽  
Polymer Chains ◽  
Copolymer Composition ◽  
Ultraviolet Spectroscopy ◽  
Ultraviolet Spectra ◽  
Styrene Acrylonitrile ◽  
Acrylonitrile Copolymers

A method is demonstrated for the interpretation of the ultraviolet spectra of styrene-containing copolymers. This method is based on the use of model molecules to approximate the absorption behaviour of the known chromophores and on the statistical estimation of the average spectra of the unknown chromophores. The analysis yields directly the copolymer composition and an estimate of the background spectra which arise from the different arrangements of the styril units along the polymer chains. It is shown that reliable composition estimates are obtained for styrene – methyl methacrylate and styrene–acrylonitrile copolymers. The results from the interpretation of the spectra are discussed and compared with results obtained from the statistical copolymerization models.

FT-IR Analysis of the Monomer Sequence Distribution of Styrene-Acrylonitrile Copolymers

1991 ◽  
Vol 45 (10) ◽  
pp. 1726-1732 ◽  
Author(s):  
M. Sargent ◽  
J. L. Koenig ◽  
N. L. Maecker
Keyword(s):  
Copolymer Composition ◽  
Sequence Distribution ◽  
Monomer Sequence ◽  
Peak Intensity ◽  
Spectral Peaks ◽  
Ft Ir ◽  
Ir Analysis ◽  
Styrene Acrylonitrile ◽  
The Individual ◽  
Acrylonitrile Copolymers

The infrared spectra for a series of random styrene-acrylonitrile (SAN) copolymers of various compositions were analyzed to determine the dependence of the individual spectral peaks on the copolymer composition. Correlations were established to relate changes in the peak positions and intensities to changes in the copolymer composition and monomer sequence distribution. It was found that a number of peaks shift to higher frequencies as the amount of acrylonitrile in the SAN copolymer is increased while others shift to lower frequencies. It was also found that some peak positions are unaffected by changes in the copolymer composition. The intensities of the spectral peaks were also analyzed as a function of the copolymer content by plotting changes in the intensity values against the number fraction of each of the possible monad, dyad, and triad structures. A peak was then determined to result from a given microstructure if there exists a positive linear relationship between the peak intensity and the number fraction of this microstructure.

Graft Polymers Derived from Natural Rubber

1956 ◽  
Vol 29 (1) ◽  
pp. 99-105 ◽  
Author(s):  
G. F. Bloomfield ◽  
F. M. Merrett ◽  
F. J. Popham ◽  
P. Mc L. Swift
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Methyl Methacrylate ◽  
Transfer Reaction ◽  
Polymer Chains ◽  
Vinyl Monomers ◽  
Grafted Polymer ◽  
Polymeric Chains ◽  
Graft Polymers ◽  
Direct Growth

Abstract Graft polymers result when vinyl monomers are polymerized in the presence of natural rubber, either in solution or as latex, and some of the polymeric chains become attached to the rubber molecules. The properties of the natural rubber can be widely modified according to the nature and the amount of the grafted polymer. The polymer-modified natural rubber appears to be produced by direct growth of polymer chains on to rubber molecules rather than by a transfer reaction involving the rubber. Graft polymers of styrene and methyl methacrylate with natural rubber can be compounded and cured to give light-colored articles of good tensile strength, and rubber-methyl methacrylate graft polymers have outstanding flex-cracking and fatigue resistance.

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