Part 1 - The Drying of Natural Rubber:
This was the initial research programme to be carried out at
the Institute of Polymer Technology as a result of renewed
interest in the area following information feed-back from the
natural rubber consumers indicating a problem of wet rubber
contamination. However, due to the difficulty in producing an
acceptable starting material, the work had to be terminated with
the compilation of what had been achieved including the literature
survey, trials to produce a representative field latex coagulum,
dewatering, diffusion and absorption experiments.
Part 2 - Further Studies of the Stress Relaxation Behaviour
of Rubber in Compression: With the development of stress relaxation measuring
equipment at the Institute of Polymer Technology, highly accurate
and reproducible results were obtained from the 'ideal curves'.
This equipment not only provides measurement of residual force and
the instantaneous modulus of a sample but also enables the whole
process from 'loading' to the measurement of subsequent relaxed
stresses to be made.
Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.