Mesomorphic polymer material usable in non linear optics

In an optoelectronic article, the improvement comprising using a mesomorphic polymeric material whose structure includes a skeleton to which side chains are attached, the material resulting from the association of a first and a second monomer, each of the monomers possessing an element of said skeleton and a side chain characteristic of this monomer, wherein:

• the skeleton is a polyacrylate, a polymethacrylate, a polychloroacrylate or a polysiloxane;
• the side chains are formed of an element specific to the monomers and a spacer allowing attachment thereof to the skeleton element;
• the spacer is of the type --(CH.sub.2).sub.n -- with 2.ltoreq.n.ltoreq.15 or --(CH.sub.2 --CH.sub.2 --O).sub.n -- with 1.ltoreq.n.ltoreq.5;
• the element specific to the first monomer is a mesomorphogenic group having a positive dielectric anisotropy;
• the element specific to the second monomer is a group having the following structure:
• D-(delocalized .pi. electron system)-A, where D is an electron donating group and A an electron accepting group, this specific element being joined to the spacer on the group D side.