Dynamic mechanical behaviour of random copolymers of a LC-methacrylate and octyl methacrylate View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-02

AUTHORS

Helena Valentová, Miroslav Kašpar, Věra Hamplová, Karel Bouchal, Michal Ilavský, Antonín Sikora, Daniel Froelich, René Muller

ABSTRACT

The dynamic mechanical behaviour of random copolymers of LC monomer - 1-(hexyl-oxycarbonyl)ethyl 4-[4-(methacryloyloxy)benzoyloxy]benzoate (HB) and octyl methacrylate (OMA) was studied in the main transition and flow regions. Even though the aliphatic end groups of the side chain of HB and OMA are roughly the same, the Tg temperature of poly(HB) is ∼ 80 K higher than that of poly(OMA); this fact is due to the presence of the stiff phenyl benzoate mesogenic group in the side chain of HB. With increasing content of OMA in the copolymer the superimposed curves of the storage G′p and los G″p moduli at a constant temperature shift towards shorter frequencies. It has been shown that this shift is mainly due to an increase of the free volume in the copolymers with increasing content of OMA. While HB monomer shows liquid crystalline (LC) properties, its polymer (poly(HB)) and random copolymers with OMA show only isotropic thermal behaviour because no flexible spacer is present in the side chain of HB which would decouple the main chain and mesogenic group motions. This means that neither the homopolymer of HB, nor its copolymers with a flexible comonomer retain the LC properties of the starting LC monomer, HB. More... »

PAGES

219-226

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002890050041

DOI

http://dx.doi.org/10.1007/s002890050041

DIMENSIONS

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