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Medhat M. Hassan,Nagwa A. Badway,Mona Y. Elnaggar,El-Sayed A. Hegazy 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
Ground tire rubber (GRT) poses a challenging environmental, economical, and disposal problem in the world because of their crosslinked three-dimensional network structure. Waste rubber from end-of-life passenger car tires was successfully devulcanized by using mechanical–chemical process. The coupling of DR with PP in different proportion was investigated by FTIR, X-ray diffraction and SEM techniques. The mechanical and thermal behaviors of the blends composed of devulcanized rubber (DR) and high crystalline polypropylene (PP) in different proportions were studied. Evaluation of the mechanical and thermal properties of the developed blends, unirradiated and gamma irradiated, was carried out using tensile strength (Ts), elongation at break (Eb), hardness, TGA and DSC measurements.
Medhat M. Hassan,Raouf O. Aly,Jehan A. Hasanen,El Sayed F. El Sayed 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Composites of waste polyethylene (WPE), collected from municipal solid waste/recycled waste rubberpowder (RWRP) reactive compatibilizing agent, maleic anhydride (MA) and glass fiber (GF) up to 20 wt%,prepared by melting and irradiated with gamma-rays up to 150 kGy have been studied. Tensile strength(TS), elongation at break (Eb), elastic modulus, hardness, thermal and morphological parameters of theirradiated composites were investigated. The examined mechanical properties have been found toimprove largely with filler content. Interesting Eb behavior has been detected for the irradiatedcomposites loaded up to ~10 wt% GF and has been basically discussed in view of matrix crystallinity andmorphology. TGA thermograms of unirradiated composites revealed enhanced thermal stability thanthat reported for the blend whereas comparatively slight improvement has been demonstrated byirradiation. Whereby insignificant alteration in Tm values was observed by loading or irradiation, yetDHm maximum of 3.41 J/g, indicated for the 5 wt% GF irradiated composite with an integral dose of75 kGy, emphasizes the influence of the relatively moderate load and dose levels on matrix stability. Thephenomenon has been confirmed by the respective SEM micrographs.
Medhat M. Hassan,E.S. Fathy,Raouf O. Aly,S.E. Abdel Aal,Ahmed M. El-Masry 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Waste rubber (WR) powder was introduced in a two-roll mill in the presence of various ratios of curatives to develop sheets of devulcanized waste rubber (DWR). The product has been investigated by FTIR, TGA and SEM. A thermoplastic elastomer (TPE) was prepared by blending the obtained DWR with high density polyethylene (HDPE) at different feed ratios under conditions of gamma irradiation, 25, 50, 100, and 150 kGy. The mechanical parameters of the blend: tensile strength, elongation at break, and hardness (Shore D) were studied. In addition, blend characterization using FTIR spectra, gel fraction, TGA and SEM was discussed.
Medhat M. Hassan,E.S. Fathy,Raouf O. Aly,S.E. Abdel Aal,Ahmed M. El-Masry 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Waste rubber (WR) powder was introduced in a two-roll mill in the presence of various ratios of curatives to develop sheets of devulcanized waste rubber (DWR). The selected product was investigated by FTIR, TGA and SEM. In a roll mill and hot press, styrene butadiene rubber (SBR) gum was differentially replaced by DWR feed ratios, and thereafter irradiated with gamma rays. The mechanical parameters of the developed blend were examined. Oil resistance and thermogravemetric behavior were discussed. Remarked improvement in the mechanical, thermal and physical parameters of SBR was generally determined by the incorporation of DWR and gamma irradiation.