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The role of the morphology of natural rubber and polybutylacrylate‐based composite latex particles on the toughness of polycarbonate/brittle polymer blends
Author(s) -
Schneider Michael,
Pith Tha,
Lambla Morand
Publication year - 1996
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199605)7:5/6<425::aid-pat504>3.0.co;2-n
Subject(s) - materials science , composite material , polycarbonate , natural rubber , toughness , composite number , izod impact strength test , brittleness , crazing , scanning electron microscope , polymer blend , polystyrene , particle (ecology) , compatibilization , polymer , copolymer , ultimate tensile strength , oceanography , geology
The dependence of the toughness of polycarbonate (PC)/poly(styrene‐co‐acrylonitrile) (PSAN) and PC/polystyrene (PS) blends on the architectural structure of incorporated natural rubber (NR) or poly(n‐butylacrylate) (PBuA)‐based latex particles is presented. By means of a twin screw extruder PC was melt blended with PSAN or PS blends containing different composite latex particles. Those materials that consisted of 70% PC could be effectively toughened by only 6–8% of the prepared toughening particles. Fractographic analysis by scanning electron microscopy has been used to analyze the failure mechanisms of the reinforced ternary PC blends. The principal feature of fracture surfaces of PC/PSAN blends containing pure NR particles was multiple rubber particle cavitation. A hard polymethylmethacrylate shell deteriorated the effectiveness of NR‐based latex particles. Rigid PS subinclusions considerably increased the performance of the NR‐based core—shell particles. They shifted the failure mechanism at impact from a brittle mode to a ductile tearing mode and much more energy could be absorbed. Good impact properties were also achieved in PC/PS blends reinforced by NR‐based core—shell particles containing rigid subinclusions. The morphological structure of smaller‐sized PBuA‐based latex particles was less crucial.