Citation: . FORMATION OF MESOPHASE MONO-DOMAINS AND MICRO-STRUCTURES IN THIN FILMS OF A SERIES OF COPOLYETHERS CONTAINING BOTH ODD-NUMBERED METHYLENE UNITS*[J]. Chinese Journal of Polymer Science, ;2001, 19(4): 391-397. shu

FORMATION OF MESOPHASE MONO-DOMAINS AND MICRO-STRUCTURES IN THIN FILMS OF A SERIES OF COPOLYETHERS CONTAINING BOTH ODD-NUMBERED METHYLENE UNITS*

Received Date: 10 August 2000
Revised Date: 10 October 2000

The structural and morphological evolution of mono-domains in thin films has been investigated for a series ofliquid crystalline (LC) copolyethers. The copolyethers studied were synthesized by the reaction of 1-(4-hydroxy-4'-biphenylyl)-2 -(4-hydroxyl-phenyl)propane (TPP) with 1, 7-dibromoheptane and 1, 11-undecane at different compositions(coTPPs-7/11). In contrast to the solution-cast thin films without annealing, which exhibit the isotropic homogeneousmolecular orientation, mono-domains with a homeotropic alignment were found in coTPP-7/11(5/5) after the thin films were annealed in the high-temperature columnar phase(φ).Similar to the nucleation process in polymer crystallization,transmission electron microscopic observations show that small mono-domains appear in the initial stage of annealing,where molecules form a uniaxial in-plane chain orientation.With increasing annealing time,the molecular orientation gradually became tilted with respect to the substrate surface,and finally,a uniaxial homeotropic molecular orientation was achieved after a prolonged annealing time.The lateral size of mono-domains was found to increase continuously with annealing time and grew into a circular shape,indicating an isotropic lateral growth scheme which implies a hexagonal molecular packing proved by the electron diffraction experiments.
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