Studies on the Toughening of Epoxy Resins

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Studies on the Toughening of Epoxy Resins

Show simple item record Unnikrishnan, K P Dr. Eby Thomas, Thachil 2008-08-27T05:13:46Z 2008-08-27T05:13:46Z 2006-01
dc.description.abstract This thesis aims to develop new toughened systems for epoxy resin via physical and chemical modifications. Initially the synthesis of DGEBA was carried out and the properties compared with that of the commercial sample. Subsequently the modifier resins to be employed were synthesized. The synthesized resin were characterized by spectroscopic method (FTIR and H NMR), epoxide equivalent and gel permeation chromatography. Chemical modification involves the incorporation of thermoset resins such a phenolics, epoxy novolacs, cardanol epoxides and unsaturated polyester into the epoxy resin by reactive belnding. The mechanical and thermal properties of the blends were studied. In the physical modification route, elastomers, maleated elastomers and functional elastomers were dispersed as micro-sized rubber phase into the continuous epoxy phase by a solution blending technique as against the conventional mechanical blending technique. The effect of matrix toughening on the properties of glass reinforced composites and the effect of fillers on the properties of commercial epoxy resin were also investigated. The blends were characterized by thermo gravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis, scanning electron microscopy and mechanical property measurements. Among the thermoset blends, substantial toughening was observed in the case of epoxy phenolic novolacs especially epoxy para cresol novolac (ECN). In the case of elastomer blending , the toughest blends were obtained in the case of maleic anhydride grafted NBR. Among functional elastomers the best results were obtained with CTBN. Studies on filled and glass reinforced composites employing modified epoxy as matrix revealed an overall improvement in mechanical properties en_US
dc.language.iso en en_US
dc.subject DGEBA en_US
dc.subject FTIR en_US
dc.subject H- NMR en_US
dc.subject Thermoset resins en_US
dc.subject Epoxy para cresol novolac (ECN) en_US
dc.title Studies on the Toughening of Epoxy Resins en_US
dc.type Thesis en_US

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