【摘要】 测量了 TS 单晶从77～300K 的介电常数和热膨胀系数,结果表明 TS 在发生非公度相变时介电常数和热膨胀系数均有反常,说明在相变过程中不仅侧链极性基团的取向发生变化,同时还存在原子的位移.更多还原

【Abstract】 The temperature dependences of the dielectric constant and thermal expansion coefficients of monomer single crystal TS have been determined for the range 77-300 K.The anomalies of dielectric constant and thermal expansion coefficient during the incommensurate phase transition haven been observed near 160 K and 203 K,indicating that the incommensurate phase transition are related to not only the orientation of polar side-group,but also the motion of atoms on the chain.更多还原