高温下尼龙11介电谱的研究

DIELECTRIC SPECTRA OF NYLON 11 AT HIGH TEMPERATURE

研究了尼龙１１在高温下的介电松弛温度谱和频率谱，发现了１个新的超强介电松弛峰——αＨ松弛峰，其松弛强度Δε可达２５３００，松弛活化能ΔＥ为８９．１ｋＪ／ｍｏｌ。αＨ松弛十分符合德拜松弛模型，相对介电常数ε′和ε″的柯尔－柯尔图接近于１个半圆。αＨ松弛是由于在高温低频下尼龙１１中不连续氢键形成的缺陷偶极子在电场的作用下产生界面极化而引起的。

The temperature dependence and the freqency dependence of the dielectric constants for nylon 11 were measured. An extremely large dielectric relaxation called αH which has a relaxation strength as high as 25300 was observed in nylon 11. The ColeCole plots of ε′ and ε″ obey the Debye model. It is found that the relaxation activation energy is about 89.1 KJ/mol. This very strong dielectric relaxation is caused mainly by the MWS polarization of free amide dipoles in nylon 11.