caa a22 4500 475765044 CHVBK 20180406123603.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1007/s003960000370 doi (NATIONALLICENCE)springer-10.1007/s003960000370 Investigation of molecular order and phase transitions of smectic poly(ester imide)s by means of small-angle X-ray scattering [Elektronische Daten] [C. Wutz, N. Stribeck, D. Gieseler] The molecular order and phase transitions of two smectic poly(ester imide)s based on aminobenzoic acid trimellitimide (PEI 1) or aminocinnamic acid trimellitimide (PEI 2) and α,ω-dihydroxydodecane were investigated by X-ray scattering. During cooling, the polymers pass through monotropic smectic liquid-crystalline (LC) phases (SA, SC), which transform into higher-ordered smectic-crystalline phases (SE, SH). The smectic layer structure of about 3 nm gives rise to a sharp reflection at 2θ ≅ 3°. Peak shape analysis and analysis of the interface distribution function revealed long-range longitudinal correlation among the mesogens in the LC phase but short-range lateral correlation. The development of a broad reflection in the small-angle X-ray scattering (SAXS, 2θ < 1°) indicates the formation of a lamellar two-phase system. The long-period changes reversibly between 10 and 30 nm with increasing temperature. The crystalline lamellae comprise a number of smectic-crystalline layers with packed mesogens, while the noncrystalline interlamellar regions keep their smectic-LC order. In the metastable SB phase, formed during annealing of quenched PEI 1, the diffuse SAXS indicates a random distribution of small, probably fringed, crystals with hexagonal-packed mesogens. In the lamellar SE and SH phases, tie molecules play an important role, but chain folding cannot be excluded. Springer-Verlag Berlin Heidelberg, 2000 Key words Smectic nationallicence Poly(ester imide)s nationallicence Small-angle X-ray scattering nationallicence Lamellar nationallicence Wutz C. Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstrasse 45, 20146 Hamburg Germany, DE aut Stribeck N. Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstrasse 45, 20146 Hamburg Germany, DE aut Gieseler D. Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstrasse 45, 20146 Hamburg Germany, DE aut https://doi.org/10.1007/s003960000370 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000370 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wutz C. Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstrasse 45, 20146 Hamburg Germany, DE aut NATIONALLICENCE 700 1- Stribeck N. Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstrasse 45, 20146 Hamburg Germany, DE aut NATIONALLICENCE 700 1- Gieseler D. Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstrasse 45, 20146 Hamburg Germany, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer