Synthesis and modification of defined plurifunctional chiral and racemic polyethers and polyesters
- Universite Pierre et Marie Curie, Paris (France)
Chiral and racemic polyethers and polyesters with reactive groups in the side-chain were synthesized by ring-opening polymerization and polycondensation. Plurifunctional polyethers are obtained by polymerizing the corresponding oxiranes bearing (-CH{sub 2}-){sub n}X, as side chain group with X = Cl, Br, OH. From these polymers liquid crystal materials are obtained by chemical modification reaction with 4-cyano-4`-hydroxy-biphenyl mesogenic group. The thermal properties are depending on the degree of substitution. Modified crystalline cyclic tetramer of epichlorohydrin developed also liquid crystalline properties close to that of the linear polymer. Cholesteric materials were obtained by polymerization of the chiral oxirane bearing the same mesogenic group in the substituent. Other structural materials can be obtained by copolymerization reactions. Polyesters with chirality in the main chain and bearing hydroxyl functional groups were prepared by polycondensation of potassium salts of (S)-malic and (R,R) tartaric acids with dibromo derivatives. These polyesters are used as carriers of biologically active agents.
- OSTI ID:
- 141691
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English