Two series of thermotropic liquid crystalline polyureas were synthesized by the copolymerization of benzidine (or o-tolidine),1,6-hexane diamine and 2,4-toluene diisocyanate.

为合成新型热致脲，以含基的苯二胺（或苯胺）、1，6-己二胺、2，4-苯二异氰酸酯为原料进行合成。