بررسي اثر پرتودهي الكتروني بر خواص فيزيكي و مكانيكي كامپوزيت پلي اتيلن سبك-خاك اره حاوي نانو رس

چكيده انگليسي :

126 Investigating the Effect of Electron Beam Irradiation on Physico Mechanical Properties of Low Density Polyethylene Sawdust Composite Containing Nanoclay Catherine Esnaashari E Esfahani c esnaashari e esfahani@ce iut ac ir 24 5 2011 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor S Nouri Khorasani saied@cc iut ac irAbstractDramatic advances in the development of wood plastic composites have germinated a great deal of research inthis promising field In the present study an attempt is made to investigate the effect of such factors as nanoclay Cloisite 10A the coupling agent of polyethylene grafted with maleic anhydride MAPE and spruce sawdustutilizing electron beam irradiation in order to measure tensile and flexural properties of the sawdust low densitypolyethylene composite as well as its water absorption To achieve this aim nanoclay cloisite 10A at levels of2 5 5 7 5 wt polyethylene grafted with maleic anhydride at levels of 1 3 5 wt spruce sawdust at levels of40 50 60 wt and electron beam irradiation dose at levels of 0 30 60 kGy were analyzed Taguchi s statisticalmethod was employed in the design of experiments According to Taguchi s L9 orthogonal array ninecompounds employing a melt blending two step process in a laboratory twin screw extruder were built Whiletensile and flexural test specimens were prepared by using injection molding method water absorption testspecimens were provided by compression molding process At 95 confidence level the findings revealed thatthe nanoclay cloisite 10A had acted as a reinforcing agent and increasing nanoclay from 2 5 to 5 wt hadimproved the tensile and flexural strengths and moduli and reduced water diffusion coefficient but also reducedtoughness the area under stress strain plot in tensile test However at 7 5 wt the reinforcing effect ofnanoclay is reduced probably due to agglomeration of nanoclay and increasing the ratio of intercalated structureto exfoliated structure At 7 5 wt nanoclay the toughness was increased 31 compared with 5 wt nanoclay The results also indicated that at 5 wt of the coupling agent MAPE compared with 3 wt the properties hadbeen either lowered or remained approximately unchanged It was also found that a rise in the weight percentageof sawdust markedly increased the tensile and flexural properties but also increased water diffusion coefficientand reduced toughness intensely Increasing electron beam irradiation dose to 60 kGy improved the tensile andflexural properties and influenced water diffusion coefficient positively By irradiating the composite at level of30 kGy the tensile modulus decreased 14 6 but by increasing the dose of electron beam irradiation to 60 kGythe composite recovered its modulus At 95 confidence level polyethylene grafted with maleic anhydride andelectron beam irradiation didn t have a significant effect on toughness With increasing nanoclay Cloisite 10Aweight percentage and increasing electron beam irradiation dose the water absorption percent after 24 hour wasincreased while water diffusion coefficient was reduced Finally X ray diffraction XRD data reflected thatintercalated and semi exfoliated structures were developed in the fabricated samples under study Themicrographs of scanning electron microscopy SEM confirmed a suitable coherence existing betweenlignocellulosic filler phase and low density polyethylene matrix The optimum point for all responses wasobtained at 7 5 wt for nanoclay cloisite 10A 5 wt for polyethylene grafted with maleic anhydride MAPE 50 wt for spruce sawdust and 60 kGy for electron beam irradiation dose respectively keywords wood plastic composite mechanical properties electron beam irradiation nanoclay waterdiffusion coefficient

اثني عشري اصفهاني، كاترين

بررسي اثر پرتودهي الكتروني بر خواص فيزيكي و مكانيكي كامپوزيت پلي اتيلن سبك-خاك اره حاوي نانو رس

كامپوزيت چوب پلاستيك , خواص مكانيكي , ضريب نفوذ آب