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Matthews, D. (1958) Some investigations of the properties of dispersions of zinc oxide in rubber. Doctoral thesis, Northern Polytechnic.
A summary of the main points of this thesis is set out in the following section.
1. The measurement of the dielectric constant of colloidal zinc oxide, over a range of frequencies (Chapter 11).
2. The discovery of the dependence of the dielectric constant of zinc oxide upon the particle size and shape, and the high dielectric constant of the acicular zinc oxide (Chapter 11).
3. The evaluation of various postulated equations for the calculation of the dielectric constant of a two phase mixture (Chapter 14).
4. The indication that the dielectric constant of a dispersion of zinc oxide in rubber can be calculated by the use of Weiner’s and Bruggeman’s Equations (Chapter 14).
5. The comparison of the actual and theoretical dielectric constants, using Lichteneker’s Equation, may indicate electrical interaction between zinc oxide particles at high volume loadings in rubber (Chapter 14).
6. The effect of particle shape upon the electrical properties of rubber compounds, with special reference to form factors (Chapter 9).
7. The development of a, satisfactory micro-sectioning technique for zinc oxide dispersions in rubber (Chapter 5).
8. The determination of the actual type of distribution of zinc oxide in practical rubber compounds (Chapter 7)
9. Measurements of the state of dispersion of colloidal zinc oxide in rubber at different volume loadings (Chapter 7).
10. The statistical analysis of dispersions of zinc oxide in rubber (Chapters 6 and 7).
11. The dependence of the physical properties of rubber compounds upon the loading of various types of zinc oxide, of varying particle size and shape (Chapter 15).
12. The indication of the possible use of ultrasonics for determining the state of dispersion of zinc oxide in rubber (Chapter 8).
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