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• W2091054346 endingPage "1978" @default.
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• W2091054346 abstract "In the present study, a series of iPP/SiO2 nanocomposites, containing 1, 2.5, 5, 7.5, 10 and 15 wt% SiO2 nanoparticles, were prepared by melt mixing in a twin screw co-rotating extruder. Poly(propylene-g-maleic anhydride) copolymer (PP-g-MA) containing 0.6 wt% maleic anhydride content was added to all nanocomposites at three different concentrations, 1, 2.5 and 5 wt%, based on silica content. Mechanical properties such as tensile strength at break and Young’s modulus were found to increase and to be mainly affected by the content of silica nanoparticles as well as by the copolymer content. For the tensile strength at break as well as for yield point, a maximum was observed, corresponding to the samples containing 2.5–5 wt% SiO2. At higher concentrations, large nanosilica agglomerates are formed that have as a result a decrease in tensile strength. Young’s modulus increases almost linearly on the addition of SiO2, and takes values up to 60% higher than that of neat iPP. Higher concentrations of PP-g-MA resulted in a further enhancement of mechanical properties due to silica agglomerate reduction. This finding was verified from SEM and TEM micrographs. Evidently the surface silica hydroxyl groups of SiO2 nanoparticles react with maleic anhydride groups of PP-g-MA and lead to a finer dispersion of individual SiO2 nanoparticles in the iPP matrix. The enhanced adhesion in the interface of the two materials, as a result of the mentioned reaction, has been studied and proved by using several equations. The increased Vicat point of all nanocomposites, by increasing the PP-g-MA content, can also be mentioned as a positive effect." @default.
• W2091054346 created "2016-06-24" @default.
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• W2091054346 date "2005-09-01" @default.
• W2091054346 modified "2023-10-14" @default.
• W2091054346 title "Compatibilisation effect of PP-g-MA copolymer on iPP/SiO2 nanocomposites prepared by melt mixing" @default.
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• W2091054346 doi "https://doi.org/10.1016/j.eurpolymj.2005.03.008" @default.
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