What is it about?
The photoacoustic method is employed to monitor the copolymer formation from ethylene vinyltrimethoxy silane and grafted vinyltrimethoxy silane on low-density polyethylene when cross-linked using water saturated vapour.
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Why is it important?
One of the special characteristics of the polyethylene is its ability to present low electrical conductivity when modified by the cross-linking processes. It is known that this property is essential for the use of this material as electrical insulating. The so-called ‘optimum point’ found for the factorial design planning used here combines the variable of the cross-linking process for the grafted PE with VTS and copolymer EVS. The figure of merit for both variables, temperature and concentration of catalyst, provides important information to be used by the wiring industries to perform dielectric rupture tests in the PE based coatings.
Perspectives
The non-destructive PAS technique indicates that among all variables used in the cross-linking process, the best ones were 80°C and catalyst in the range from 5% to 7%. In the frequency scanning analysis no distinct crosslinking effect either series PEg or Cop was observed. However, this analysis located groupings –OH and –CH2– as being more concentrated at the surface than in the bulk, showing a larger gradient for –CH2– than –OH grouping. Intensity slopes indicate that grafted PE samples present these absorbing groups more at the surface when compared to Cop samples.
Professor Daniele T Dias
Federal University of Technology - Paraná
Read the Original
This page is a summary of: Photoacoustic study of cross-linking process in grafted polymer and copolymer based on ethylene and vinyltrimethoxy silane, Journal of Physics D Applied Physics, November 2002, Institute of Physics Publishing,
DOI: 10.1088/0022-3727/35/24/315.
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