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Aging of Surface Anchoring and Surface Viscosity of a Nematic Liquid Crystal on Photoaligning Poly-(Vinyl-Cinnamate)

Aging of Surface Anchoring and Surface Viscosity of a Nematic Liquid Crystal on Photoaligning Poly-(Vinyl-Cinnamate)

M Vilfan, I D Olenik, A Mertelj, M Copic

Phys Rev E Stat Nonlin Soft Matter Phys. 2001 Jun;63(6 Pt 1):061709.

PMID: 11415125

Abstract:

Dynamic light scattering was used to measure the azimuthal anchoring energy coefficient W(straight phi) of nematic liquid crystal (5CB) on photoaligning poly-(vinyl-cinnamate) layer. Measurements were repeated several times within two months. The results show that W(straight phi) increases in the first few days after filling the cell with liquid crystal. Then it remains approximately constant at W(straight phi)=5 x 10(-6) J/m(2) for at least two months. Also, presence of very large effective surface viscosity is observed. This phenomenon is of transient nature and attributed to swelling and dissolving of photosensitive polymer into the liquid crystal, which gives rise to an inhomogeneity of viscoelastic properties. Numerical modeling of the fluctuation spectrum shows that an inhomogeneous surface layer can account for the observed effective surface viscosity.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9050060	Poly(vinyl cinnamate)		9050-06-0	Price

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