Abstract
Many of the polymeric materials used for structural purposes have weak mechanical properties, these characteristics can therefore be improved by preparing a hybrid laminar composite. In this work use melting mixing method using screw extruder to prepare sheets of polymer blends and nanocomposites based on polymer blends, and using a hot hydraulic press machine to prepared hybrid laminates composites. Two groups of hybrid laminar composites were prepared, the first group is consist of [((94%PP: 5%PMMA: 1 %( PP-g-MA)): 0.3% ZrO2): 6%KF and 8%KF] and the second group is [((94%PP: 5%UHMWPE: 1 %( PP-g-MA)): 0.3% ZrO2): 6%KF and 8%KF]. The results illustrated the impact strength and fracture toughness are increase with increased weight percentage of Kevlar fiber in for both groups of laminar composites and the highest values for two groups are (58.1, 54.95 KJ/M2) and (8.4, 9.16 MPa√m) respectively, any that, at the rate of increment reached to (120.4%, 107%) and (52.7%, 66.5%) respectively, compared with the neat PP. Moreover, the flexural strength values of the first group samples of hybrid laminar composite remained constant, when added kevlar fiber to nanocomposite. While, the flexural strength values of the second group samples of hybrid laminar composite increase with increase the ratio of kevlar fiber in composite to reach the maximum values (92 MPa) at 8% wt. of kevlar fiber, any, at the rate of increment reached to 39.4% compared with the neat PP. As well as, the results shown that the flexural properties and fracture toughness of the second group samples higher than they are for the first group samples.
Highlights
In the current of technological development, most of the materials available for structural applications have come in the form of fibers in small diameters
Another study in the field of hybrid composites about the mechanical properties of the composites [ reinforced with (0.5%SiO2 or 3%TiO2)] were used as matrix for hybrid laminated composites materials, reinforced with different types woven fibers of(13%E-glass fibers or 13%Kevlar fibers). the results showed that the mechanical properties increase with addition any type of woven fiber and the results shows the polymer blend nanocomposite [(EP: 2%NR: 5%PMMA):0.5%SiO2] reinforced with any type fiber giver higher mechanical properties as a compared with [(EP: 2%NR: 5%PMMA):3%TiO2] reinforced with same type and ratios of fiber [6]
In one of structural applications of polymer composite materials consisting of (PMMA- - woven fiber) the results shown enhancement in compressive strength values with added and the maximum of compressive strength reached for PMMA when reinforced with (ZrO2 powder and glass fiber) [7]
Summary
In the current of technological development, most of the materials available for structural applications have come in the form of fibers (either in the form of textiles or non-woven) in small diameters (within 5 to 40 microns). In addition to what mention above, there is a lot of researches work in the direction of FRC, one of them was done by A.N. Dickson et al where this work study some mechanical properties of nylon matrix reinforced with three different types of woven fiber are (glass, carbon and Kevlar fibers). The study shows that, the mechanical properties (tensile and flexural strengths) increase with addition any type from this fiber and the highest enhancement was achieved for nylon matrix when reinforced with the carbon fiber [3]. Another study in the field of hybrid composites about the mechanical properties of the composites [ (epoxy resin with 2% Nature rubber:5%PMMA) reinforced with (0.5%SiO2 or 3%TiO2)] were used as matrix for hybrid laminated composites materials, reinforced with different types woven fibers of(13%E-glass fibers or 13%Kevlar fibers). The current work is an attempt to improve some important mechanical properties in the direction of structural applications for polypropylene material , through the preparation of hybrid laminar nanocomposites by addition one or two layers of woven kevlar fiber, to the plates prepared from nanocomposites based on polymer blends of (PP: 5% PMMA: 1%(PP-g-MA)) and (PP: 5% UHMWPE: 1%(PP-g-MA))
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