Determining the Polydispersity in Chemical Composition and Monomer Sequence Distribution in Random Copolymers Prepared by Postpolymerization Modification of Homopolymers

2012 ◽  
Vol 1 (9) ◽  
pp. 1128-1133 ◽  
Author(s):  
Wayne Powers ◽  
Chang Y. Ryu ◽  
Young K. Jhon ◽  
Lawrence A. Strickland ◽  
Carol K. Hall ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Random Copolymers ◽  
Sequence Distribution ◽  
Monomer Sequence

The effect of sequence distribution on glass transition in the theory of the cooperative Behaviour of random copolymers

1981 ◽  
Vol 4 (1-2) ◽  
pp. 9-16 ◽  
Author(s):  
Ivan Havlíček ◽  
Ján Biroš ◽  
Jiří Podešva ◽  
Jaroslav Hrouz
Keyword(s):  
Glass Transition ◽  
Random Copolymers ◽  
Cooperative Behaviour ◽  
Sequence Distribution

Monomer Sequence Distribution in Butadiene Styrene Copolymers

1970 ◽  
Vol 43 (5) ◽  
pp. 1138-1153 ◽  
Author(s):  
V. D. Mochel ◽  
B. L. Johnson
Keyword(s):  
Aromatic Proton ◽  
Analog Computer ◽  
Curve Analysis ◽  
Nmr Spectrum ◽  
Sequence Distribution ◽  
Monomer Sequence ◽  
Styrene Copolymers ◽  
Overlapped Peaks ◽  
Sequence Distributions ◽  
Butadiene Styrene

Abstract A method is described for determining styrene sequence distribution in butadiene-styrene copolymers. An analog computer is used to resolve overlapped peaks in the styrene aromatic proton NMR spectrum. In n-BuLi copolymers a quite quantitative distinction can be made between “short” sequences, containing two and three styrene units, and “long” sequences, containing more than three units. With this method it is possible to determine experimentally the styrene-centered triad distributions and approximate styrene sequence distributions of butadiene—styrene copolymers. Agreement between calculated and NMR-curve analysis results is good, especially for n-butyllithium-catalyzed butadiene—styrene copolymers.

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