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نویسندگان مقالات پربازدید :
مواد و طراحی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • structural, thermal, mechanical and dynamic mechanical properties of cenosphere filled polypropylene composites

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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 420
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     polypropylene (pp)/cenosphere based composites were fabricated and characterized for their structural/morphological and mechanical properties such as tensile, flexural, impact and dynamic mechanical properties such as storage and loss moduli as a function of temperature. the morphological attributes were characterized by scanning electron microscopy (sem) and wide-angle x-ray diffraction (waxd) while the thermal characterizations were done by conducting differential scanning calorimetry (dsc) and thermo-gravimetric analysis (tga). the morphological investigations have revealed a uniformly distributed/dispersed state of the cenosphere in the bulk pp matrix of the composites. the waxd/dsc studies have revealed a decrease in crystallinity of the composites with increase in cenosphere content. dynamic mechanical analysis (dma) revealed an enhancement in the energy dissipation ability of the composite with 10 wt.% of cenosphere and an increase in the storage modulus up to ∼30% in the composites relative to the soft pp-phase. the tensile modulus increased up to ∼43% accompanied by a nominal decrease in tensile strength while the strain at break remained largely unaffected. the impact strength of the composites marginally reduced compared to pp indicating a low-cost material-concept with maximized stiffness–toughness combination. the theoretical modeling of the tensile data revealed appreciable extent of phase-adhesion despite the cenospheres lack any surface modification indicating better extent of mechanical interlocking and surface-compatibility between polymer and filler. fractured surface morphology indicated that the failure mode of the composites undergoes a switch-over from matrix-controlled shear deformation to filler-controlled quasi-brittle modes above a cenosphere loading of 10 wt.% in the composites.

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