Gas permeation in miscible homopolymer–copolymer blends. I. Poly(methyl methacrylate) and styrene/acrylonitrile copolymers

1987 ◽  
Vol 34 (3) ◽  
pp. 1037-1056 ◽  
Author(s):  
J. S. Chiou ◽  
D. R. Paul
Keyword(s):  
Methyl Methacrylate ◽  
Gas Permeation ◽  
Poly Methyl Methacrylate ◽  
Copolymer Blends ◽  
Styrene Acrylonitrile ◽  
Acrylonitrile Copolymers

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.

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