Abstract
The work is devoted to the study of the effect of characteristics (melt flow and density) of various grades of polyethylene on the electrical resistance of polyethylene composites with carbon black at normal and elevated temperatures. Such polyethylene composites are characterized by abnormally high values of the positive temperature coefficient of electrical resistance in the melting temperature range of the polyethylene matrix. This causes the effect of power self-regulation of such heaters (selfregulating polymer heaters). It has been established that the content of carbon black, which provides a stable and clear effect of self-regulation of such heaters, is located in a concentration region approaching the region of the second concentration-structural percolation transition, which for all investigated polyethylene composites was about 12 vol% of carbon black. The growth rate of electrical resistance at these carbon-black contents is influenced by crystallinity of the polyethylene matrix.
Highlights
Работа посвящена изучению влияния характеристик различных марок полиэтиленов на величину электрического сопротивления полиэтиленовых композитов с техническим углеродом при нормальной и повышенных температурах
The work is devoted to the study of the effect of characteristics of various grades of polyethylene on the electrical resistance of polyethylene composites with carbon black at normal and elevated temperatures
Such polyethylene composites are characterized by abnormally high values of the positive temperature coefficient of electrical resistance in the melting temperature range of the polyethylene matrix
Summary
Работа посвящена изучению влияния характеристик (текучести расплава и плотности) различных марок полиэтиленов на величину электрического сопротивления полиэтиленовых композитов с техническим углеродом при нормальной и повышенных температурах. На интенсивность роста электрического сопротивления при этих содержаниях технического углерода влияет степень кристалличности полиэтиленовой матрицы композитов. Такие полимерные композиты характеризуются аномально высокими положительными термическими коэффициентами (ПТК) электрического сопротивления [2, 4 7] при температурах, близких к температурам начала плавления полимерной матрицы, что обычно связывают с влиянием теплового расширения полимера и увеличением расстояний между частицами ТУ.
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