Fracture mechanics and microscopy of unplasticised polyvinyl chloride
| Autor: | Darcy J. M. Clark |
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| Rok vydání: | 2014 |
| Předmět: | |
| DOI: | 10.14264/uql.2014.566 |
| Popis: | The general scope of this project was to further the level of knowledge regarding unplasticised PVC pipes. Both fracture mechanics and microscopical techniques were utilised in this study.The fracture mechanics work focussed on the R-curve test, in particular evaluating this test as a possible assessment technique for the suitability of a pipe for service conditions. It was found that the R-curve test was too specific to the middle pipe wall and hence probably not a good measure of the overall resistance of the pipe to failure by crack growth. It was determined that the test was only capable of differentiating pipe of overtly opposing levels of processing. Pipes processed over a limited range of temperatures were not able to be differentiated by the R-curve test.The microscopical work centred on the imaging of fine-scale ordering within solution-cast PVC thin films using high-resolution TEM and digital image processing techniques. A small degree of ordering was observed of the same nature and distribution as described by the microdomain model for crystallinity in PVC. A combination of the 2D Fourier transform and intensity thresholding techniques was instrumental in obtaining this result. These and other techniques utilised in this study may be applicable to the imaging of ordering in other near-amorphous materials. |
| Databáze: | OpenAIRE |
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