Theoretical Study of the Solvent Effect on Functional Group Properties and on the Charge Distribution and Acidity of Alkyl-Substituted Alcohols

1998 ◽  
Vol 102 (27) ◽  
pp. 5253-5259 ◽  
Author(s):  
B. Safi ◽  
K. Choho ◽  
F. De Proft ◽  
P. Geerlings
Keyword(s):  
Solvent Effect ◽  
Charge Distribution ◽  
Functional Group ◽  
Theoretical Study

scholarly journals Determination of the degree of randomness in condensation copolymers containing both symmetrical and unsymmetrical monomer units: a theoretical study

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Martine Tessier ◽  
Alain Fradet
Keyword(s):  
Nmr Spectroscopy ◽  
Ethylene Terephthalate ◽  
Functional Group ◽  
Theoretical Study ◽  
Rational Functions ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Average Block

Abstract Expressions for the degree of randomness, B, and for the number- and weight-average block lengths of condensation copolymers containing both symmetrical (AA + BB) and unsymmetrical (AB) monomer units are established through an approach based on functional group probabilities. Several parameters introduced in literature to characterize randomness in AA + BB condensation copolymers are also calculated using this approach and compared to B, showing that they are simple linear or rational functions of B. A method for calculating functional group probabilities from the dyad and triad number-fractions determined by NMR spectroscopy is described for poly(ethylene terephthalate)-poly(ε-caprolactone) copolyesters. This method obviously applies to any AA + BB + AB polycondensation and is easily generalizable to other types of condensation copolymers.

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