Abstract
A series of vinyl ester and polyurethane interpenetrating polymer networks were prepared by changing the component ratios of VER (Vinyl ester) and PU (Polyurethane) and the polymerization process was confirmed with Fourier Transform infrared spectroscopy. IPN (Inter Penetrating Polymer Network - VER/PU) reinforced Glass and carbon fiber composite laminates were made using the Hand lay up technique. The Mechanical properties of the E-glass and carbon fiber specimens were compared from tests including Tensile, Compressive, Flexural, ILSS (Inter Laminar Shear Strength), Impact & Head Deflection Test (HDT). The IPN Reinforced Carbon fiber specimen showed better results in all the tests than E-Glass fibre reinforced IPN laminate with same thickness of the specimen, according to ASTM standards. It was found that the combination of 60%VER and 40%PU IPN exhibits better impact strength and maximum elongation at break, but at the slight expense of mechanical properties such as tensile, compressive, flexural, ILSS properties. The morphology of the unreinforced and reinforced composites was analyzed with help of scanning electron microscopy.
Highlights
Nowaday’s fiber Reinforced composites are widely price, abrasion resistance, shock absorption and elasticity used for many applications like structural, marine, property[5,6,7].aerospace, automobile, windmill blades etc., because of Normally Fiber Reinforced Plastics (FRP) (Fibre Reinforced Plastic) manufacturers their high strength to stiffness, weight to stiffness ratio[1]. employ the chemistry to add more value to their products Especially in naval applications, its requirement is gone to make them competitive in the product in the field of use, to the maximum extent of building the hulls and various but time and cost incurred for these phenomena is quite structures
Two types of fiber were used for the comparsion purpose to fabricate the IPN reinforced composite material. Both fibers were purchased with the specification of plain woven fabric type; one is Woven E-Glass fiber (350 gsm) and another one Carbon fiber (350 gsm) both the fibers were used as the reinforcing materials in polyurethane/Vinyl ester interpenetrating polymer networks
Addition of 10% PU and 20% PU prepolymer in to Vinyl ester (VER) system does not show any marked change in the absorption bands indicating that IPN composed of VER and PU can be considered as ideal ones with negligible chemical bonds between the two networks[8,10,11]
Summary
Nowaday’s fiber Reinforced composites are widely price, abrasion resistance, shock absorption and elasticity used for many applications like structural, marine, property[5,6,7]. Significant development and rigorous ageing the required property Though this process diminishes tests have been conducted over the FRP material, in the individual characterictics of the resin, it substantially order to understand, improve and investigate the material for different environmental conditions. From the point of view, IPNs are special class of polymer networks Figure 1, bonded together with the permanent or physical entanglement not on covalent bonds Their isotropic morphology study and mechanical is one of the predominant thermosetting resin in many propeties like tensile, flexural, impact have completely decades and it is widely accepted as the FRP manufacturers being studied and reported in many publications.
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