作 者: ;
机构地区: 中山大学物理科学与工程技术学院物理系
出 处: 《中山大学学报(自然科学版)》 1998年第3期68-71,共4页
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. 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.