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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Sizings"”.
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Thermoplastic Sizings: Effects on Processing, Mechanical Performance, and Interphase Formation in Pultruded Carbon Fiber/Vinyl-Ester Composites
Sizings, a thin polymer coating applied to the surface of the carbon fiber before impregnation with the matrix, have been shown to affect the mechanical performance of the composite. These sizings affect the processability of the carbon fiber that translates into a composite with less fiber …
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Dynamic mechanical analysis of graphite/epoxy composites with varied interphases
… run data indicates that the variation in fiber sizings create different interphase regions that are detectable by DMA. However, some post-cured specimens revealed that those differences are reduced with further heat treatment. Fiber sizing variation also affects the material response to thermal …
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The Use of Nanonindentation to Determine Composite Interfacial Shear Strength and the Effects of Environmental Aging
Fiber sizings are used to improve the performance of fiber-reinforced polymer composites made from low-cost fiber and matrix materials. Evaluation of three sizings, poly(vinylpyrrolidone) (PVP), a carboxyl modified polyhydroxyether (PHE), and a standard industrial sizing (G'), have revealed …
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Interphase properties and their effects on the compression mechanics of polymeric composites
… of two distinct interphases developed from fiber sizings and study their effect on the static and fatigue compression performance. Two different interphases, as formed by the introduction of contrasting fiber sizings, were studied in this dissertation. The interphase produced from the amorphous …
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The Effect of Chemistry and Network Structure on Morphological and Mechanical Properties of Diepoxide Precursors and Poly(Hydroxyethers)
… polyurethanes were investigated as carbon fiber sizings. The three poly(hydroxyether)s resulted in different interphase morphologies due to their respective interdiffusion into the vinyl ester resin. The unmodified poly(hydroxyether) was miscible with the vinyl ester resin at the elevated cure …
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Optimization of high-speed CMOS circuits with analytical models for signal delay
… different circuit topologies and transistor sizings, especially in submicron region. The program reads in circuit description from SIS--a multi-level logic synthesis and minimization system, maps it into CMOS circuit stages, analyzes the performance and finds the optimal circuit topology and …
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Durability of Polymer Matrix Composites for Infrastructure: The Role of the Interphase
… submitted to various peer reviewed journals. The sizings used have been poly(vinylpyrrolidone) PVP and Polyhydroxyether (Phenoxy) thermoplastic polymers and G' an industrial sizing material supplied by Hexcel. A number of issues have been addressed ranging from viscoelastic relaxation to …
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Understanding the Effect of Sizing and Cellulose Nanocrystals on S2 Glass Fiber Sheet Molding Compounds
… differences in the functional groups of the sizings were identified. This behavior is attributed to the enhanced interfacial interactions between the sizing and the fiber surface in the more conforming sizing films. The effect of CNCs on the mechanical properties of S2-GFRPs was marginal. …
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The processing and characterisation of recycled glass fibre composites
… strength of the glass fibres and organic sizings are degraded during thermal recycling processes which leads to a lower composite performance when the recycled fibres are processed into composites. The main objective of this thesis was to develop composites based on thermally recycled …
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Cresol Novolac/Epoxy Networks: Synthesis, Properties, and Processability
… resins. Both sequestered catalyst particles and sizings were investigated for this purpose. Phenolic novolac/epoxy mixtures containing sequestered catalysts exhibited significantly longer processing time windows than those containing free catalysts. The resins also showed accelerated reaction …
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Effect of fiber/Matrix Interphase on the Long Term Behavior of Cross-Ply Laminates
… but with different fiber surface treatments and sizings were used in this study. The fibers used in the 810A and 820 A systems received 100% and 200% industry standard surface treatments respectively and were sized with Bisphenol-A unreacted epoxy material. The 810 O system was manufactured with …