Abstract

Chiral fluorinated side-chain liquid-crystalline elastomers (LCEs)IP-IVPwere graft copolymerized by hydrosilylation reaction. The chemical structure, liquid-crystalline behavior and polarization property were characterized by use of various experimental techniques. The effective crosslink density of the chiral LCEs was studied by swelling experiments. All the samplesIP-IVPdisplayed chiral smectic C mesophase (SC*) on heating and cooling cycles. With increasing chiral crosslinking units in the elastomer systems, the glass transition temperature and chiral smectic C mesophase-isotropic phase transition temperature of fluorinated elastomers increased slightly, indicating that the temperature range of SC*mesophase became narrow with increase of chiral crosslinking agents for all the chiral fluorinated elastomers. All the samplesIP-IVPshowed 0.12-0.16 μC/cm2of spontaneous polarization.

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