Selective compatibilization for suffer, high impact TPO / clay nanocomposites

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Proceedings titleSociety of Plastics Engineers - 11th-Annual Automotive Composites Conference and Exhibition, ACCE 2011
Conference11th-Annual Automotive Composites Conference and Exhibition: Driving Design, ACCE 2011, 13 September 2011 through 15 September 2011, Troy, MI
SubjectCavitation stress; Clay nanocomposites; Control experiments; Ethylene propylene copolymers; Flat sheets; High impact; Impact property; Masterbatch; Micro-structural; Organoclay content; Organoclays; Stress and strain; Toughening effects; Twin screw extruders; Young's Modulus; Automobile exhibitions; Compatibilizers; Copolymers; Coupling agents; Ethylene; Maleic anhydride; Nanocomposites; Plastic products; Tensile properties; Yield stress; Organoclay
AbstractDifferent compatibilization strategies from master batch mixing using a twin-screw extruder with various coupling agents were investigated to improve the stiffness of nanocomposites based on a high impact TPO (n-lzod > 600 J/m) with 2% and 4% of organoclay content. Three coupling agents based on grafted maleic anhydride polymers (gMA) were used to tailor the compatibility of the organoclays to either or both the rubbery domains and the polyolefin matrix. A detailed microstructural of the different nanocomposites revealed the preferential presence of organoclays in the rubbery domains, the matrix or both depending on the masterbatch sequential compounding strategy, i.e. the type of coupling agent(s) mixed with the type of organoclay. As anticipated, the presence of organoclays in both the matrix for improved tensile properties (Young's modulus and stress and strain at yield) and in the rubbery domains for higher impact resistance (n-lzod at 0 and 23°C and flat sheet impact at -40°C). A control experiment on a blend of PP and an ethylene-propylene copolymer with a PPgMA coupling agent and organoclay compounded in a similar fashion led to the usually improved tensile properties but reduced impact resistance. In this case, the organoclay was found present in the matrix only, as the coupling agent used could not compatibilize the organoclay to the copolymer phase. It is concluded that organoclays act on the rubbery phase to increase its toughening effect in the TPO, presumably by increasing the cavitation stress of the TPO.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21271079
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Record identifierd284f99f-db36-45de-b038-daed3084596f
Record created2014-03-24
Record modified2016-05-09
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