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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 71 to 80 of 282 (0.018 seconds)| 71 |
The solvent resistance of aromatic polymer compositesRandles, Steven James January 1990 (has links)
The diffusion rate of a large range of solvents into carbon fibre reinforced PEEK (APC-2) has been measured to discover the effect of the physical characteristics of the solvent. Three dimensional graphs have been plotted which correlate four parameters (solvent size, shape, hydrogen bonding capacity and solubility parameter) to solvent uptake. In the composite the effects of: thickness, lay-up, background water content and strain level on solvent diffusion have been assessed. The effect of composite thickness can be predicted using the film thickness scaling law provided the diffusion is Fickian. The effect of background water content is small, tending to make the diffusion profile two-stage. The effect of lay-up has been shown to have a major Affect on diffusion rate, unidirectional lay-ups having a much slower diffusion rate. Several theories have been postulated to explain this behaviour. The effects of stress on diffusion rate can be predicted by free volume models, provided that the stress/strain is kept below a certain critical level. It has been shown that the damage caused by a solvent, provided the stress does not exceed a critical value, is dependent on the amount of solvent in the matrix. This is due to plasticisation effects. Attempts to model this behaviour using free volume models have proved successful. Stress has been shown to enhance environmental attack. With certain solvents, above a critical stress or strain, environmental stress cracking occurs, leading to a considerable reduction in mechanical properties. Photographic evidence shows that cracking is initiated at stress concentrators within the matrix. Crack propagation is entirely matrix related and independent of spherulite boundaries. Overall, APC-2 has been shown to possess excellent environmental resistance when used in aerospace applications.
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Experimental study of anisotropy in injection molded thermoplastic partsBakerdjian, Zaven January 1978 (has links)
No description available.
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Mechanical properties and orientation in short fibre composites.Sudlow, Michael John. January 1972 (has links)
No description available.
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A novel coextrusion process for the manufacture of short fiber-reinforced thermoplastic pipe /Doshi, Shailesh R. January 1986 (has links)
No description available.
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Phase segregation study of thermoplastic polyurethanesMace, Tamara Lee, January 2003 (has links) (PDF)
Thesis (Ph. D.)--School of Textile and Fiber Engineering, Georgia Institute of Technology, 2004. Directed by Haskell Beckham. / Vita. Includes bibliographical references (leaves A1-A2).
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The effect of cold rolling on the formability of thermoplastics /Lee, Yew-wing. January 1987 (has links)
Thesis--M. Phil., University of Hong Kong, 1987.
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Mechanical properties and orientation in short fibre composites.Sudlow, Michael John. January 1972 (has links)
No description available.
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Experimental study of anisotropy in injection molded thermoplastic partsBakerdjian, Zaven January 1978 (has links)
No description available.
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Study of polyarylene ether and its application in isotropically conductive adhesiveLiong, Silvia 08 1900 (has links)
No description available.
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A novel coextrusion process for the manufacture of short fiber-reinforced thermoplastic pipe /Doshi, Shailesh R. January 1986 (has links)
No description available.
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