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Mechanical and Rheological Characteristics of Micro-Particle Maize Tassel-Filled Polypropylene Micro-Composites

材料科学与工程（中英文B版） 2011年第2期1卷 131-147页

作者： Emmanuel Rotimi Sadiku Annet Chacko Lekgethile Mable Karabo Kekana Goitseona Phiri Jonathan Okechukwu Okonkwo caliphs musa zvinowanda Mahlatsa Mapula Sekhula Nana Mensah Agyei Department of Mechanical Engineering （Polymer Technology） Tshwane University of Technology CSIR Campus Lynnwoodridge 0400 Rep. of South Africa Department of Environmental Water and Earth Science Faculty of Science Tshwane University of Technology Pretoria 0001 Rep . of South Africa Department of Chemistry University of Limpopo Medunsa 0204 Rep. of South Africa

Maize tassel was pulverized into micro-particulate size. The tassel particles, at various degree of loading (ranging between 0-10%), were used as fillers, in polypropylene. The resulting mixtures were melt-extruded, pelletized, moulded into tensile test specimens and tested for their rheological performance and mechanical integrity. Activation energy, a E Δ, of flow from rheological tests increases with % tassel loading. This implies that increase in tassel loading impedes smooth pliability of the composites, since higher energy for flow is needed for ease processability as the tassel loading increases. The improvement in stiffness with tassel content is the expected effect, caused by the addition of rigid filler into the semi-rigid matrix and dynamic storage modulus " G change in the transition of the composites appears smaller than that of the virgin PP. The decrease in " G (10% tassel loading) at 190 oC with respect to neat PP in the glassy region could be as a result of agglomeration of particles due to high load loss. The % strain decreases asymptotically as a function of tassel loading, while tensile strength grows asymptotically. The work-of-rupture (area under the stress vs. strain curve) decreases with % tassel loading with a polynomial model, having a coefficient of fit, R2 of ~0.9956. Tensile strength (polynomially modeled), decreased with increasing tassel loading, with a coefficient of fit, R2 of ~0.9979. This is attributed to the different polarities of the components of the composite, resulting from the non-use of a coupling agent. Generally, there is an increase in the Young’s modulus with increasing tassel loading. For instance, at 10% tassel loading, the Young’s Modulus improved only by about 1? folds the value of the virgin PP. A linear model for the Young’s Modulus did not produce a strong coefficient of fit (R2 of ~0.7701) when compared to the tensile strength. Impact strength decreased exponentially with increasing tassel loading (R2 ~0.8504).

关键词：填充聚丙烯复合材料微观粒子流变特性力学性能雄穗玉米多项式模型

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