Thesis-2005-Haria.pdf (9.38 MB)
Download fileEvaluation of carbon blacks and binders in polymer thick film resistors
thesis
posted on 2013-08-05, 13:20 authored by Niraj HariaThis objective of this project is to develop an understanding of the ink and its interaction with
substrate of Penny & Giles controls Ltd's conductive plastic potentiometers, so as to develop
alternate ink, substrate and processing methods. Conductive plastic potentiometers comprises, a
track containing polymer binder and carbon black, printed on a base plastic substrate. The
objectives have to take into account the performance ofthe potentiometers, which are to be
improved or maintained.
The first stage of the project was concerned with investigating the properties of the carbon black
used in the inks, which have a major effect on the performance of the potentiometers. Ten
different carbon blacks with different properties were selected. The carbon blacks properties for
most of these were characterised by techniques that included transmission electron microscopy,
x-ray photoelectron spectroscopy, differential scanning calorimetry, laser induced mass
spectrometry and the scanning electron microscope. Inks were made with most of individual
carbon blacks, and then tracks were produced on the diallyl phthalate plastic substrate. The
electric resistance of these tracks was measured allowing the effect of carbon black properties on
performance of the track to be studied. Various carbon black were found to provide similar
performance to the Vegetabke MR842N, carbon black used currently.
The next stage was the investigation of effect of binder on the performance of resistor using the
same techniques as used in the first stage so that comparison could be made with the current
binder. A phenolic binder was used and again showed similar properties to the DAIP binder used
currently
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Publisher
© Niraj HariaPublication date
2005Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough UniversityEThOS Persistent ID
uk.bl.ethos.493279Language
- en