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

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

Papers | Updated：2021-06-21

- FORMATION OF MESOPHASE MONO-DOMAINS AND MICRO-STRUCTURES IN THIN FILMS OF A SERIES OF COPOLYETHERS CONTAINING BOTH ODD-NUMBERED METHYLENE UNITS*
- Vol. 19, Issue 4, Pages: 391-397(2001)
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- Published：20 August 2001
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FORMATION OF MESOPHASE MONO-DOMAINS AND MICRO-STRUCTURES IN THIN FILMS OF A SERIES OF COPOLYETHERS CONTAINING BOTH ODD-NUMBERED METHYLENE UNITS*[J]. 2001, 19(4): 391-397.
DOI：

FORMATION OF MESOPHASE MONO-DOMAINS AND MICRO-STRUCTURES IN THIN FILMS OF A SERIES OF COPOLYETHERS CONTAINING BOTH ODD-NUMBERED METHYLENE UNITS*[J]. 2001, 19(4): 391-397. DOI：

摘要

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.

Abstract

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

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

indicating an isotropic lateral growth scheme which implies a hexagonal molecular packing proved by the electron diffraction experiments.

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