Tensile properties and meso-scale mechanism of weft knitted textile composites for energy absorption
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Thermosetting polymer
Polypropylene
Textile
Nylon 6
The nanocomposites of polypropylene (PP)/graphene were prepared by melt blending. The effects of the dosage of graphene on the flow and mechanical properties of the nanocomposites were investigated. The morphologies of fracture surfaces were characterized through scanning electron microscopy (SEM). The graphene simultaneous enhanced tensile and impact properties of nanocomposites. A 3.22% increase in tensile strength, 39.8% increase in elongation at break, and 26.7% increase in impact strength are achieved by addition of only 1 wt.% of graphene loading. The morphological behavior indicates the fracture surface of PP/graphene is more rough than that of pure PP.
Polypropylene
Elongation
Melt flow index
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Abstract Polypropylene containing comminuted fiber reinforced thermoset recyclate has been shown to exhibit enhanced mechanical properties relative to particulate‐filled materials. Optimum mechanical performance in these recyclate‐filled materials is achieved in compositions made from rubber‐modified polypropylene containing maleic anhydride‐modified PP in conjuction with silane coupling agent. Although matrix crosslinking was found to enhance properties in both filled and unfilled systems, composite properties are dominated by the development of strong interfacial bonding between polypropylene and recyclate reinforcement. A mechanism for the formation of interfacial bonding is proposed involving reaction between maleic anhydride functionalized PP, formation of trisilanol groups and their subsequent condensation with hydroxyl groups on the recyclate surfaces, together with molecular entanglement and co‐crystallization of the grafted and ungrafted polypropylene molecules. Furthermore, in the absence of treatment there is evidence that the elastomer particles encapsulate the filler particles. However, this effect is strongly hindered when functionalized‐PP is added, either in isolation or in combination with the silane co‐treatment. The crystalline nucleation of PP by thermoset recyclate and treatment is also considered. The treatment system investigated was found to promote interfacial bonding to both the polyester (DMC) and woven glassreinforced phenolic recyclates investigated, suggesting it may be suitable for treating mixed composite scrap.
Polypropylene
Thermosetting polymer
Maleic anhydride
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Exfoliated graphite nano-platelets
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Polypropylene
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Thermoplastic polyurethane
Polypropylene
Compounding
Thermal Stability
Thermogravimetric analysis
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Ceramic matrix composite
Sialon
Delamination
Hot pressing
Carbon fibers
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The effect of different regimes of heat treatment on the tensile strength of SiC coated composite of C fibers reinforced Al wires has been investigated.Their tensile strength may increase under treatment either at 500℃ for 2h or 550℃ for 1h,but decrease over 600℃.After the strength tests of extracted fibers from composite wires,the SiC coating is an excellent protection to C fibers.EPMA and EDAX showed that the C/Al interface of the composite wires is stable under treatment below 600℃,but unstable at 650℃
Isothermal process
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Isothermal process
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The effect of different regimes of heat treatment on the tensile strength of SiC
coated composite wires of carbon fibers reinforced Al has been investigated. Their tensile
strength may increase under treatment either at 500℃ for 2 h or 550℃ for 1h, but decrease over
600℃. After the strength tests of extracted fibers from composite wires, the SiC coating is an ex-
cellent protection to carbon fibers, EPMA and EDAX showed that the C/Al interface of the
composite wires is stable under treatment below 600℃, but unstable at 650℃.
Isothermal process
Carbon fibers
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Polypropylene
Viscose
Tribometer
Microfiber
Molding (decorative)
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