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The role of the compatibilizer on the microindentation hardness of iPP/PC blends
Author(s) -
Hellati A.,
Douibi A.,
Boufassa S.,
Benavente R.,
Benachour D.,
Baltá Calleja F.J.
Publication year - 2016
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.24346
Subject(s) - materials science , maleic anhydride , crystallinity , differential scanning calorimetry , composite material , polypropylene , polycarbonate , crystallization , polymer blend , tacticity , compatibilization , polymer chemistry , copolymer , polymer , chemical engineering , polymerization , physics , engineering , thermodynamics
Blends of isotactic polypropylene (iPP) and polycarbonate (PC) with and without a compatibilizer were prepared using a Brabender Haake Rheocord at 260°C and 32 rpm. Maleic anhydride grafted styrene‐ethylene/butylene‐styrene (SEBS‐ g ‐MAH) and maleic anhydride grafted ethylene–propylene diene (EPDM‐ g ‐MAH) were chosen as compatibilizers and their proportion was set to 5, 10, and 15 wt%, respectively. The thermal properties and crystallization behavior were determined by differential scanning calorimetry (DSC) and wide angle X‐ray scattering (WAXS). Micromechanical properties were also investigated using a Vickers microindentation tester. The DSC analysis indicates that the melting temperature of iPP in the all the blends, compatibilized and uncompatibilized ones, remains constant and is almost the same as those of the pure component. On the other hand, it is shown that the degree of crystallinity of iPP in the blends calculated by DSC and WAXS is dependent of the composition of the polymeric mixture. However the hardness ( H ) decreases with increasing PC content until the composition of iPP/PC (75/25) is reached, whereas for larger PC content values, H increases. The same trend was obtained with the addition of both compatibilizers. POLYM. ENG. SCI., 56:1138–1145, 2016. © 2016 Society of Plastics Engineers