摘要
A series of poly{2,5-bis[(4-butoxyphenyl)-oxycarbonyl]styrenes}(PBPCS)with low mo-lecular weight distribution was synthesized by atom transfer radical polymerization(ATRP).The me-somorphic properties were investigated by differential scanning calorimetry(DSC),polarizing optical microscopy(POM)and rheometer.PBPCS showed the phase transition from isotropic into liquid crystal(LC)phase,and the LC phase formed at high temperature and disappeared in the subsequent cooling procedure.Using the WAXD fiber pattern,the phase structure of the PBPCS at higher tem-perature showed hexagonal columnar nematic phase.Experimental results demonstrated that the driving force of the entropy is an important factor during the unusual LC phase formation of PBPCS.
基金
This work was supported by the National Natural Science Foundation of China(Grant No.20134010)
the Ministry of Education of China(Key Project No.104005).
