Influence of hygrothermal environment on thermal and mechanical properties of carbon fiber/fiberglass reinforced matrix composite materials
The absorption and diffusion of water in a carbon fiber/glass fiber hybrid composite was investigated. Water-sorption experiments, mechanical property tests and dynamic mechanical analysis (DMA) were performed after immersion in water at different temperatures for up to 32 weeks. The moisture uptake mechanism exhibited by the hybrid fiber system was determined to be more complex than the single fiber type. Weight-change profiles for the composites fitted the theoretical Fickian diffusion curve during the initial immersion time, but diverged substantially as time progressed. The shear properties and the glass transition temperature (Tg) were sensitive to the effects of hygrothermal environment, and values for both decreased with increasing water uptake. Microscopic inspection of water-soaked samples showed no cracking when the absorption was less than saturation. The thermal and mechanical properties were mostly retained (after drying), provided
Moisture Absorption of Graphite-Epoxy Composites Immersed in Liquids and in Humid Air
Moisture absorption of graphite-epoxy composites immersed in liquids and in himid air were investigated. The moisture content as a function of time and temperature was measured for three materials: Fiberite T300/1034, Hercules AS/3501-5 and Narmco T300/5208. Tests were per formed a) with the materials immersed in No. 2 diesel fuel, in jet A fuel, in aviation oil, in saturated salt water, and in distilled water (in the range of 300 to 322 K) and b)with the materials exposed to humid air (in the range 322 to 366 K). The results obtained were compared to available composite and neat resin data.
Handbook of Engineering Polymeric Materials
Artificial neural networks as a semi-empirical modelling tool for physical property predictions in polymer science new generation high performance polymers by displacement polymerization acrylamide polymers transparent polyolefins the polyolefins stabilizers with intramolecular synergism high-temperature stabilization of polyolefins poly(malic acid) from natural sources stabilization of polyolefins gamma radiation induced preparation of polyelectrolytes and its use for treatment of waste water polyvinylchloride (PVC)/thermoplastic polyurethane (TPU) polymeric blends mechanical properties of ionomers and ionomer blends metallocene based polyolefins - product characteristics preparations and properties of porous poly(vinyl alcohol)-poly(vinyl acetate) composites hydrophobization of polyanionic polymers to achieve higher biological activity uniform latex particles reaction mechanism of vinyl polymerization with amine in redox and photo-induced charge-transfer initiation systems photoinitiation of free-radical polymerization by organometallic compounds chemical modification of polystyrenes in the presence of cationic catalysis and their industrial applications performance of polyethylenes in relation to their molecular structure the crystallization of polyethylene under high pressure structure, stability, and degradation of PVC solution state of metal complex calixarenes and polymetric calixarenes thermodynamic opportunity of degradation reaction initiation polymerization by ylides. (Part contents).