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Layer structures: 10. Conformation and dynamics of long aliphatic spacers in smectic layers of poly(ester–imide)s based on 4-aminobenzoic acid trimellitimide by Nicolas Probst; Christoph Wutz; Hans R. Kricheldorf is a Materials Science article available to read on EtoBox.

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1,12-Dihydroxydodecane and 1,22-dihydroxydocosane were prepared from diacetylene precursors in such a way that the four central methylene groups were deuterated. These deuterated spacers were polycondensed with the acid chloride of N-(4Ј-carboxyphenyl)trimellitimide. Analogous poly(esterimide)s were prepared from fully protonated spacers. Furthermore, copolyesters were synthesized from a 1/1 mixture of 1,12-dihydroxydodecane and 1,22-dihydroxydocosane, one of which contained a deuterated dodecane spacer, whereas in the analogous polyester the docosane spacer is deuterated. All poly(ester-imide)s were subjected to a thermal treatment yielding a smectic-E phase in the solid state. 13 C nuclear magnetic resonance (n.m.r.) cross polarization magic angle spinning CP/MAS spectra revealed that spacers with Ն 12 methylene groups contain trans-trans conformations even up to 100ЊC. 2 H n.m.r. spectroscopic measurement revealed that the spacers are nearly immobile at 1 180ЊC, but gain increasing mobility upon heating. Whereas the central segments of the docosane spacer can perform crank-shaft motions at ambient temperature, the motion of the dodecane spacer is restricted to kinks. At 100ЊC th

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Author

Nicolas Probst; Christoph Wutz; Hans R. Kricheldorf

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)