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Molecular Motion Analysis of 5CB in PDLCs Using Solid-State 13C NMR Relaxation Spectroscopy

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In samples of polymer-dispersed liquid crystals (PDLCs), submicron droplets of liquid crystal reside within a polymer matrix. By the use of the cross polarization technique for solid-state 13C NMR spectroscopy, the NMR spectrum of the liquid crystal can be obtained without interference from the polymer spectrum, even though the two materials have some similar chemical structures. Both 13C T 1 and 13C T 1 ρ relaxation experiments were performed on a PDLC system of 5CB in epoxy as a function of 5CB domain size. The 13C T 1 relaxation constants and the localized motions they measure showed no significant change over the liquid crystal domain size studied. However, the 13C T 1 ρ relaxation constants and the segmental motions of molecules they measure revealed a significant change over the liquid crystal domain size studied. Therefore, the 13C T 1 ρ values can be used to determine the change in mobility of the molecular segments of the 5CB molecules resulting from increased interaction between the liquid crystal and the polymer matrix and to further understand the importance of the molecular motions of the liquid crystal in the switching phenomenon for PDLC materials.

Keywords: 13C NMR relaxation spectroscopy; 5CB and epoxy; Droplet size; PDLC; Polymer-dispersed liquid crystals; T1 relaxation

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934415174

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

Publication date: July 1, 1993

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