Side-Chain Liquid Crystalline Alternating Copolymers of Mesogenic Monomers: Synthesis and Properties

Michele Laus, Maria Chiara Bignozzi, Annino Sante Angeloni, Giancarlo Galli, Emo Chiellini

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

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 originaleInglese
pagine (da-a)3999-4005
Numero di pagine7
RivistaMacromolecules
Volume26
Numero di pubblicazione15
DOI
Stato di pubblicazionePubblicato - 1993
Pubblicato esternamente

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