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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Published on: May 15, 2017

Surface localized polymer aligned liquid crystal lens.

Lu Lu1, Vassili Sergan, Tony Van Heugten

  • 1Chemical Physics Interdisciplinary Program and Liquid Crystal Institute Kent State University, Kent, OH 44242, USA.

Optics Express
|April 3, 2013
PubMed
Summary
This summary is machine-generated.

Surface localized polymer alignment (SLPA) enables precise control over liquid crystal (LC) device pretilt angles. This method simplifies the fabrication and operation of tunable LC cylindrical lenses, eliminating the need for complex substrates or electrodes.

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Area of Science:

  • Materials Science
  • Optics
  • Polymer Science

Background:

  • Liquid crystal (LC) devices rely on precise control of molecular alignment.
  • Existing methods for controlling pretilt angles can be complex and limit device design.
  • Tunable optical elements are crucial for advanced photonic applications.

Purpose of the Study:

  • To fabricate a liquid crystal (LC) cylindrical lens using the surface localized polymer alignment (SLPA) method.
  • To demonstrate the ability to control the focal length of the LC lens.
  • To simplify the fabrication and driving processes for LC lenses.

Main Methods:

  • Utilized the surface localized polymer alignment (SLPA) technique for fabricating the LC lens.
  • Controlled the polar pretilt angle as a function of position.
  • Employed a non-segmented electrode to vary the focal length.

Main Results:

  • Successfully fabricated an LC cylindrical lens with position-dependent polar pretilt angles.
  • Demonstrated that focal length is determined by polymerization conditions and adjustable via a simple electrode.
  • Achieved a parabolic phase profile without shaped substrates or complex electrode patterns.

Conclusions:

  • The SLPA method offers complete control over pretilt angles in LC devices.
  • This technique enables simple fabrication and driving of tunable LC cylindrical lenses.
  • The developed LC lens is a promising component for simplified optical systems.