METHOD OF MEASURING CROSS-LINKING DEGREES OF LOW AND HIGH DENSITY POLYETHYLENE (VERSIONS) AND DEVICE FOR ITS REALISATION Russian patent published in 2017 - IPC G01N27/62 

FIELD: measuring equipment.

SUBSTANCE: method is used to measure the cross-linking degree of polyethylene (PE) of low (LDPE) and high density (HDPE). The difference is measured for amplitude of maxima ΔI spectra of thermostimulated depolarization currents (TSD) of coronoelectret LDPE and HDPE with the thickness of h>250 µm before and after stitching using a device, in which upon measuring the spectra of the thermostimulated depolarization currents, the polyethylene samples are placed between the grounded electrode measuring and the blocked electrode with blocking insulation in the form of a non-polar layer of silicon dioxide resulting from annealing at 700-1000°C of Muscovite mica plates with the thickness of 10 microns. Spectra measurement of the thermostimulated depolarization currents of sewn and unsewn polyethylene of low and high density is carried out at a linear heating rate β=10 deg/min, and degree of cross-linking of the polyethylene is determined using the following mathematical expression: C_cl=ΔI/I_{max ncl}, where C_cl - the coefficient of the cross-linking degree; ΔI - the current reduction at the maximum of the spectra of thermostimulated depolarization currents after cross-linking, A.

EFFECT: ability to improve the accuracy of determining the degree of cross-linking of insulating high density polyethylene and low-density polyethylene.

3 cl, 2 dwg