The present work was focused on investigating the potential of using side chain liquid crystalline Polymers (SCLCP) as nucleating agents for semicrystanine Polymem For this purpose

two vinyl monomers with liquid crystalline properties were designed and prepared．By means of homopolymefization two side chain liquid crystalline polymers having different architectures were synthesized．The monomers and the Polymers obtained were characterized by elemental analysis．FTIR and 1H-NMR measurements．DSC and HS-POM were employed to study the phase-transition tempemtums and mesophase textures for the polymem．The thermal stability of the polymem was measured by TGA．The results showed that the polymem were all thermotropic side chain liquid crystalline polymem with wide liquid crystalline phase temperature range and excellent thermal stability．The effect of one of the SCLCPs used as a nucleating agent in the crystallization of high density Polyethylene (HDPE) was investigated by DSC and HS-POM．The results indicated that SCLCP could effectively increase the crystallization temperature

crystallization speed and the crystallinity for HDPE．It was found that the synthesized SCLCP could be an effective nucleating agent for HDPE.