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Influence of the Stereochemical Structure on The Physicochemical Properties of Polymers Prepared by Ring-Opening Polymerization of Chiral Heterocyclic Monomers

Nicolas Spassky ; Laboratoire de Chimie Macromoleculaire, UA 24 Universite Pierre et Marie Curie 4, Place Jussieu 75252 Paris Cetiex 05, France
Alain Leborgne ; Laboratoire de Chimie Macromoleculaire, UA 24 Universite Pierre et Marie Curie 4, Place Jussieu 75252 Paris Cetiex 05, France
Maurice Sepulchre ; Laboratoire de Chimie Macromoleculaire, UA 24 Universite Pierre et Marie Curie 4, Place Jussieu 75252 Paris Cetiex 05, France

Sažetak

Physico-chemical properties of polymers prepared by ringopening
polymerization of heterocyclic chiral monomers with different enantiomeric composition are compared. Two general kinds of behaviour were observed for products with a monosubstituted
carbon in the chain: when the substituent group is not bulky the properties of polyenantiomers and their racemic mixture are very similar ; when the substituent is a bulky group, e. g. t-butyl, many of the properties (m.p., crystalline structure, solubility, etc.) are very different for the same polymers. The corresponding statistical stereocopolymers are amorphous. For polymers with disubstituted asymmetric carbon atoms the statistical stereocopolymers are crystalline and their melting behaviour varies with the enantiomeric purity. In some cases a strong dependence of the mechanical and biological properties on the enantiomeric purity of stereocopolymers is reported.

Ključne riječi

Hrčak ID:

176170

URI

https://hrcak.srce.hr/176170

Datum izdavanja:

1.3.1987.

Posjeta: 866 *