Phase Diagrams and Phase Separation Dynamics in Mixtures of Side-Chain Liquid Crystalline Polymers and Low Molar Mass Liquid Crystals

Autor:	Hao-Wen Chiu, L.-C. Chien, Leonorina G. Cada, Thein Kyu, Z. L. Zhou
Rok vydání:	1996
Předmět:	chemistry.chemical_classification Phase transition Molar mass Polymers and Plastics Mesogen Organic Chemistry Thermodynamics Polymer Miscibility Inorganic Chemistry chemistry Liquid crystal Materials Chemistry Side chain Organic chemistry Phase diagram
Zdroj:	Macromolecules. 29:1051-1058
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma951190e
Popis:	Miscibility phase diagrams and phase separation dynamics in mixtures of side-chain liquid crystalline polymers (SCLCP) and monomeric liquid crystals have been investigated experimentally in order to test with theoretical predictions. The theoretical calculation on equilibrium phase diagrams of binary nematic mixtures involves a combination of the Flory−Huggins (FH) free energy for isotropic mixing in conjunction with the Maier−Saupe (MS) free energy for nematic ordering of the mesogenic units. Two orientational order parameters and two nematic−isotropic (NI) transitions of the constituent mesogens are taken into consideration in the calculation. This combined FH−MS theory predicts a variety of phase diagrams depending on the relative strength of the cross-interaction between two dissimilar mesogens as compared to that in the same species. A series of epoxy resins [ethylene glycol glycidyl ether (EGDE)] grafted with mesogenic amines 4-(ω-aminoalkoxy)-4‘-cyanobiphenyl were synthesized. The temperature−compo...
Databáze:	OpenAIRE
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