Polyacrylates SCLCP

Many reviews [1-3] of SCLCPs describe the structure of the backbone (main chain), the spacer (flexible linkage), and the side group (mesogenic unit) of the SCLCP. For example, the most widely used backbones include polyacrylates or polymethacrylates, polysiloxanes, and polyphosphazenes po-ly-ct-chloroacrylates, itaconates, and ethylene oxides have also been reported. 

DR measurements of scLCPs were initiated by Kresse and colleagues, who studied polyacrylate-based polymers, and most by far mol-... 

First to observe and classify different dielectric relaxtion processes present in scLCPs were Zentel and coworkers/ who studied unoriented samples of several different polyacrylate-based scLCPs over a wide range of temperature, covering the isotropic, mesomorphic, and solid states (Fig. 4.23). They observed up to three high-frequency relaxations (namely, the and y-processes) in the glassy state, and... 

Very sparse dielectric studies of polysiloxane scLCPs below the glassy transition show evidence of only one relaxation process, similar to the -process in polyacrylates, with a very broad distribution of relaxation times.The temperature dependence is Arrhenius and the activation energy of 51 kJ mol matches that of the jSi-process in poly acrylates (see above). Measurements performed on the oriented smectic glass show that... 

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