(2) Diffusion type polarizer.
A film, in which microcrystals are uniaxially aligned works as diffusion type polarizer, if one of the refractive indices of microcrystal coincides with the matrix transparent polymer. Combination of urea crystal and PEMA satisfies the above condition. Magnetic alignment is used to align urea microcrystals. [Polymer Prep. Jpn, 51, 726 (2002)]

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