Theses & Dissertations

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https://hdl.handle.net/20.500.14170/194

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Browsing Theses & Dissertations by Subject "Acrylonitrile butadiene styrene (ABS)"
  • Publication
    Properties of eggshell powder filled low density polyethylene/ acrylonitrile butadiene styrene composites
    ( 2009)
    Mohammed Jasim Mohammed Al-Jumaili
    Eggshell powder is one of the most abundant materials on our planet and has been quite early used in ground form to produce polymer composites. Chemical unmodified and modified eggshells powder filled low density polyethylene and acrylonitrile butadiene styrene composites were studied. The compositions of LDPE/ABS/ESP with and without coupling agent were fixed which is the total weight are 120g per formulations. The composite was melt mixed at temperature of 200℃ and rotor speed of 50 rpm. Afterwards, the blend was compression molded in an electrically heated hydraulic press and was preheat at temperature for about 7 minutes and heated temperature about 4 minutes and cooled for 4 minutes. It was found those LDPE/ABS/ESP composites with N-acetyl N,N,N-trimethyl Ammonium Bromide as a coupling agent exhibit higher mechanical properties; tensile strength increased while elongation at break were decreased. Swelling behavior analysis shows that the composites with coupling agent had more water absorption. The differential scanning calorimetry analysis shows that the glass transition temperature, Tg and melting temperature, Tm of the modified LDPE/ABS/ESP composites increased. The Thermogravimetry analysis shows that the T-50% wt, final decomposition temperature and residual mass for modified compositions increased with increasing filler loading. The scanning electron microscopy (SEM) analysis shows that the modified LDPE/ABS/ESP composites has more tear line and rough tensile fracture surface than unmodified LDPE/ABS/ESP composites. The X-ray diffraction (XRD) analysis exhibited the d-spacing in the modified LDPE/ABS/ESP composites have higher than the unmodified LDPE/ABS/ESP composites, the interlayer distance decreased with increasing the filler loading.
      4  2
  • Publication
    Properties of water hyacinth fibers (Eichhornia crassipes) filled low density polyethylene/acrylonitrile butadiene styrene composites
    ( 2009)
    Ahmed Saleem Oleiwi Al-Khuzaie
    The water hyacinths are largely available in local rivers. In this research, the water hyacinth fibers have been used as reinforcing components for low density polyethylene (LDPE) and acrylonittile butadiene styrene (ABS). The chemical treatment using Isophorone diisocyanate (IPDI) and 1, 4-butanediol were carried out to modify the fiber properties. The effect of filler loading and IPDI-polyol as a coupling agent on mechanical properties, morphology, swelling behavior, thermal properties and thermal degradation were investigated. The composites were prepared by using Z-blade mixer at processing temperature 200 0C and rotor speed 50 rpm and mixed samples were then compressed by using a hydraulic hot press at the same temperature to form sheet samples composites. Generally, the results indicated that LDPE/ABS/WHF composites with IPDI-polyol as a coupling agent showed better mechanical properties and water absorption resistance than LDPE/ABS/WHF composites without IPDI-polyol. Micrograph of tensile fractured surface shows that the properties of modified fibers composites have better filler dispersion in matrix and embedded fiber into the matrix compared to unmodified fiber composites. It was also found that the modified WHF offers better thermal stability in the LDPE/ABS/WHF composites than unmodified LDPE/ABS/WHF composites.
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