【摘要】 测量了聚合度由５０～８２４的二甲基硅油的频域和时域低温介电谱，其结果和聚合度几乎无关．在－１２０℃的玻璃化转变中频域损耗只有一个小峰，但时域慢介电常数却出现显著的强峰，由分子的螺旋结构解释了实验结果．更多还原

【Abstract】 The frequency and time domain dielectric spectra of polydimethylsiloxane of polymerization degree 50 to 824 are measured in low temperature.The results are independent of polymerization degree.In glass transition near -120 ℃ the frequency loss is shown to present a peak;and the time domain slow dielectric constant presents a higher peak in the same temperature.The results are explained using the screwed structures of molecules.更多还原