Abstract: A rubber composition comprising a diene rubber and a liquid crystal elastomer. It is preferred that the liquid crystal elastomer has a (liquid crystal phase)-to-(isotropic phase) transition temperature (Ti) of 20° C. or less. It is preferred that the liquid crystal elastomer has a functional group that reacts with the diene rubber. It is preferred that the functional group is a functional group containing at least a sulfur atom. It is preferred that the liquid crystal elastomer is a liquid crystal polyurethane elastomer. Moreover, it is preferred that the liquid crystal polyurethane elastomer is a reaction product of a mesogenic group-containing compound having at least an active hydrogen group, an isocyanate compound, a polysulfide-containing compound, and a photopolymerizable group-containing compound.

Abstract: A rubber composition comprising a diene rubber and a liquid crystal elastomer. It is preferred that the liquid crystal elastomer has a (liquid crystal phase)-to-(isotropic phase) transition temperature (Ti) of 20° C. or less. It is preferred that the liquid crystal elastomer has a functional group that reacts with the diene rubber. It is preferred that the functional group is a functional group containing at least a sulfur atom. It is preferred that the liquid crystal elastomer is a liquid crystal polyurethane elastomer. Moreover, it is preferred that the liquid crystal polyurethane elastomer is a reaction product of a mesogenic group-containing compound having at least an active hydrogen group, an isocyanate compound, a polysulfide-containing compound, and a photopolymerizable group-containing compound.