Abstract
We report synthesis and characterization of a new class of side-chain liquid crystalline random terpolymers (SCLCP), its cross-linked network (SCLCN), and the corresponding shape memory properties. The SCLCP comprising three monomers, 5-{15-(cholesteryloxycarbonyl)-pentadecyloxycarbonyl}-bicyclo[2.2.1]hept-2-ene (NBCh15), 5-(acryloyl butoxycarbonyl)-bicyclo[2.2.1]hept-2-ene (NBBA), and poly(ethylene glycol) functionalized norbornene (NBPEG), is synthesized by ring-opening metathesis polymerization (ROMP) using Grubbs catalyst second generation, resulting in a random terpolymer. Each monomer provides a specific function in the terpolymer: (1) NBCh15 affords liquid crystalline properties, (2) NBBA is a cross-linkable unit, and (3) NBPEG acts as an internal plasticizer. The mesomorphic structure of the terpolymer investigated by X-ray diffraction (XRD) exhibits highly interdigitated smectic A (SmA) mesophase comprising cholesteryl ester mesogens. The acrylate end group in the NBBA undergoes cross-linking by ...
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