Thermal investigation of the nematic-isotropic biphase in a thermotropic main-chain polyester

The biphasic behavior at the nematic--isotropic transition for a thermotropic main-chain polyester was studied by differential scanning calorimetry and optical microscopy. The demixing and thermal evolutions of the macroscopically segregated nematic and isotropic components were monitored upon annea...

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Bibliographic Details
Published inMacromolecules Vol. 24; no. 7; pp. 1459 - 1463
Main Authors Laus, M, Caretti, D, Angeloni, A. S, Galli, G, Chiellini, E
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 01.04.1991
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
Biphasic system
Optical texture
Nematic state
Phase separation
Thermotropic state
Ether copolymer
Benzoic derivative copolymer
Liquid crystals
Phase transitions
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Summary:The biphasic behavior at the nematic--isotropic transition for a thermotropic main-chain polyester was studied by differential scanning calorimetry and optical microscopy. The demixing and thermal evolutions of the macroscopically segregated nematic and isotropic components were monitored upon annealing at different temperatures inside the biphasic gap. The equilibrium distribution of the various molecular species at the nematic--isotropic transition and the thermodynamic biphase range were determined. The observed phase segregation is attributed to chain length heterogeneity of the sample, with the longer chain macromolecules tending to selectively segregate into the nematic phase. Graphs. 28 ref.--AA
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ISSN:0024-9297
1520-5835
DOI:10.1021/ma00007a004