The synthesis of side chain cholesteric liquid crystalline polymers (Pn series) and elastomers (Pe series) containing both 4-allyloxybenzoylcholeseterate (Mch) and 4-allyloxybenzoyloxy-4′-methoxyphenyl (Mn) or 2-tert-butylhydroquinone di(4-(b-acryloyloxy hexyloxy) benzoate) (Mnc) mesogenic side groups was described．The chemical structures of the obtained polymers and elastomers were confirmed by FT-IR spectroscopy．Their mesomorphic properties and phase behavior were investigated with POM

DSC

TGA and X-ray measurements．The liquid crystalline polymers Pn1～Pn8 and elastomers Pe1～Pe7 exhibited cholesteric grandjean texture or oily streak texture．In Pn series

with increasing the concentration of the cholesteric mesogenic Mch

the glass transition temperature(Tg) increased from 8.7℃ to 65.7℃

and the clearing point temperature(Tc) increased from 42.0℃ to 251.8℃．In Pe series

with increasing the concentration of the nematic liquid crystalline crosslinking agent Mnc

Tg decreased from 65.7℃ to 52.7℃

and Tc had no significant change．When the concentration of Mnc was greater than 8 mol％

the DSC curves of Pe6 and Pe7 did not show the clearing point temperatures

but POM observations exhibited the grandjean texture

which did not disappear until their decomposition．The polymers Pn1～Pn11 and elastomers Pe1～Pe7 had wide mesomoephic temperature ranges．TGA measurements showed that the temperature at which a 5％ mass loss occurred was higher than 280℃ for all the liquid crystalline polymers and ealastomers．