Influence of the Polymer Matrix on the Bipolar and Radial Droplet Configurations within PDLC Films Examined by Infrared Spectroscopy

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Abstract:

The influence of the polymer matrix on the liquid crystal droplet configuration within a polymer-dispersed liquid crystal (PDLC) film is studied with the use of infrared spectroscopy. With a change of the polymer from poly(n-butyl methacrylate) to poly(isobutyl methacrylate) with the use of E7 liquid crystal, the droplet configuration changes from bipolar to radial. For both of these PDLC systems with 80:20, 70:30, and 60:40 E7/polymer compositions, the LC droplets grow in diameter with time. The spectroscopic data monitoring the droplet growth are described exponentially. A transition temperature is observed as both types of PDLCs cool, forming droplets by the thermally induced phase-separation technique. The T N-I transition for the E7/PBMA PDLC appears at 46°C and for the E7/PIBMA PDLC appears at 51°C.

Keywords: FT-IR spectroscopy; Polymer-dispersed liquid crystals (PDLC)

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934067270

Affiliations: 1: Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106 2: Liquid Crystal Institute, Kent State University, Kent, Ohio 44242

Publication date: May 1, 1993

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