Abstract
Seven new vinyl ether and fumarate monomers containing different mesogenic groups were synthesized and copolymerized to obtain three series of side-chain liquid crystalline copolymers. The freeradical copolymerization of the monomers led to copolymers with nearly alternating structures, although a preferential incorporation of fumarate units was always observed. Alternating tendency and composition behavior of the copolymers were interpreted in terms of a penultimate unit effect model. By appropriately adjusting the stoichiometry of the feed mixture, copolymers with a random distribution of mesogenic groups were also prepared. Comparison of the nematic-to-isotropic transition temperature and entropy (TNI, ΔSNI) of alternating copolymers revealed that the randomization of mesogenic groups produces a moderate but definite increase in both the stability (TNI) and degree of order (ΔSNI) of the nematic mesophase.
Lingua originale | Inglese |
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pagine (da-a) | 3999-4005 |
Numero di pagine | 7 |
Rivista | Macromolecules |
Volume | 26 |
Numero di pubblicazione | 15 |
DOI | |
Stato di pubblicazione | Pubblicato - 1993 |
Pubblicato esternamente | Sì |