Investigation of molecular order and phase transitions of smectic poly(ester imide)s by means of small-angle X-ray scattering

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 liq...

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Bibliographic Details
Published in:Colloid and polymer science 2000-11, Vol.278 (11), p.1061-1069
Main Authors: WUTZ, C, STRIBECK, N, GIESELER, D
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Cooling
Correlation analysis
Exact sciences and technology
Organic polymers
Phase transformations
Phase transitions
Physicochemistry of polymers
Polyetherimides
Properties and characterization
Reflection
SAXS
Small angle X ray scattering
Thermal and thermodynamic properties
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Summary: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 (S^sub A^, S^sub C^), which transform into higher-ordered smectic-crystalline phases (S^sub E^, S^sub H^). The smectic layer structure of about 3nm gives rise to a sharp reflection at 2[theta]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, 2[theta]
ISSN:0303-402X
1435-1536
DOI:10.1007/s003960000370