Comparative study on the properties of rice straw/polypropylene and micaceous clay/polypropylene composites

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dc.contributor.authorKry Nallis
dc.date.accessioned2014-11-03T02:14:02Z
dc.date.available2014-11-03T02:14:02Z
dc.date.issued2009
dc.descriptionMasteren_US
dc.description.abstractComparative study on the properties of an agricultural waste, rice straw (RS), reinforced polypropylene composites and mineral filler, micaceous clay (MC), reinforced polypropylene composites was investigated in this study. Micaceous clay reinforced polypropylene (MC/PP) composites were prepared with different MC contents from 0 to 70% by weight. However, for rice straw reinforced polypropylene (RS/PP) composites, only composites with rice straw contents from 0 to 60% by weight were prepared. The mixture was prepared by mixing in a Brabender Plasticorder PLE331 (50rpm, 1800C) and hot press molding method (1800C, 1500psi) followed by cold pressing. Both types of composites obtained were characterized for impact strength, tensile properties (0 wt%-40 wt%), dry and wet flexural properties, water absorption and expansion in thickness. The tensile fracture surface, impact fracture surfaces and flexural fracture surfaces were analyzed using scanning electron microscopy (SEM). From the test results, tensile strength and impact strength of RS/PP and MC/PP composites decreased as the filler contents increased and the tensile and impact strength of MC/PP are better than the tensile and impact strength of RS/PP composite. On the other hand, dry and wet flexural strength of MC/PP composites reached maximum 20 wt% of MC content. The dry flexural strength of MC/PP composites and RS/PP composites is higher than its wet flexural strength. However, the dry and wet flexural strengths of MC/PP composites is higher than dry and wet flexural strength of RS/PP composites. In the modulus case, the dry and wet flexural modulus and tensile modulus of RS/PP composites and MC/PP composites increased with increasing RS and MC contents. Nevertheless, the dry and wet flexural modulus and tensile modulus of MC/PP composites are higher compared to the dry and wet flexural modulus and tensile modulus of RS/PP composites. Moreover, RS/PP composites absorbed more water than MC/PP composites. The water absorption of RS/PP and MC/PP increased with increasing RS and MC contents. Expansion in thickness of RS/PP composites and MC/PP composites simultaneously increased as the water absorption increased. In addition, morphological observation of MC/PP composites indicates a gradual change of tensile fracture behavior from ductile to brittle and poor interaction between PP and MC. However, the morphological study on RS/PP composites showed the cavities and pull out of rice straw at higher RS contents for tensile and impact fracture surfaces which indicate a poor interaction between fillers and the matrix polymer. However, the flexural fracture surfaces showed blisters in the composites at lower RS contents as a result of using compression molding during the sample preparations.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/249
dc.language.isoenen_US
dc.subjectChemical scienceen_US
dc.subjectRice straw/polypropyleneen_US
dc.subjectMicaceous clay/polypropyleneen_US
dc.titleComparative study on the properties of rice straw/polypropylene and micaceous clay/polypropylene compositesen_US
dc.typeThesisen_US
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