Mixtures consisting of mono-functional polymerizable liquid crystals (PLC) having a polymerizable moiety on the molecular short axis terminal and a bifunctional PLC having the polymerizable moieties on the molecular long axis terminals were prepared. These mixtures had a wide liquid crystal range. Uniaxially aligned films were prepared from the PLC mixtures by photo polymerization after aligning the molecular directions by the rubbing method. The thermal conductivity of the films increased from 0.45 to 0.68 W/m . K with the increase of the content of the bi-functional PLC. The relation between the thermal conductivity and the PLC network styles was investigated from the aspect of the molecular order. (c) 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3453-3458, 2007.