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Librations of Probe Molecules in Polymeric Matrixes

Librations of Probe Molecules in Polymeric Matrixes

S Yu Grebenkin, V M Syutkin

J Phys Chem B. 2014 Mar 6;118(9):2568-75.

PMID: 24521212

Abstract:

Formation of optical anisotropy under linearly polarized light has been studied in films of poly(n-butyl methacrylate) and poly(n-hexyl methacrylate) doped with azo compound (1-naphthyl-p-azo-methoxybenzene). Time profiles of the absorption anisotropy and absorbance can not be fitted with a commonly used model of anisotropy formation, which includes the transition dipole turns upon cis-trans isomerization and the rotational diffusion: the experimental values of anisotropy happen to be much lower than the calculated ones. To explain the low anisotropy level, fast molecular librations, i.e., stochastic pendulum-like oscillations of azo molecules about their average orientations were introduced. Numerical simulation of anisotropy and absorbance time profiles with the modified model gives estimates for average libration amplitude of 45-60° at temperatures 25-65 K below T(g).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP31547850	Poly(1-naphthyl methacrylate)		31547-85-0	Price

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