Fracture studies of polypropylene/nanoclay composite. Part I: Effect of loading rates on essential work of fracture |
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Authors: | K Saminathan P Selvakumar Naresh Bhatnagar |
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Institution: | aMechanical Engineering Department, Indian Institute of Technology Delhi, New Delhi 110016, India |
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Abstract: | Polypropylene (PP)/Montmorillonite (MMT) nanoclay based composite was prepared by melt compounding with maleic anhydride grafted polypropylene (MA-g-PP) as a compatibilizer in a twin-screw extruder, and the test specimens were injection molded. Mechanical properties such as tensile modulus, flexural modulus, yield strength and maximum percent strains were measured for pure PP and PP based nanocomposite to establish the effect of clay platelet reinforcement. The fracture properties were measured by using the essential work of fracture (EWF) method. PP/clay nanocomposite shows 25% improvement in specific EWF compared to pure PP. The variation of EWF parameters with loading rate is discussed, whilst the mechanisms of fracture are considered in a subsequent paper. |
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Keywords: | Polypropylene Nanocomposite Essential work of fracture Shear yielding |
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