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Impact modification of PA‐6 and PBT by epoxy‐functionalized rubbers
Author(s) -
Lievana Emiliano,
KargerKocsis József
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200351206
Subject(s) - materials science , epoxy , charpy impact test , composite material , polybutylene terephthalate , heat deflection temperature , natural rubber , glass transition , toughness , polyamide , izod impact strength test , acrylonitrile , nylon 6 , ethylene propylene rubber , polymer , copolymer , ultimate tensile strength , polyester
Glycidylmethacrylate (GMA) grafted apolar (ethylene/propylene/diene ‐ EPDM) and polar (acrylonitrile/butadiene ‐ NBR) rubbers were melt blended with polyamide‐6 (PA‐6) and polybutylene terephthalate (PBT). The toughness of the blends containing 5, 10 and 50 wt.% epoxy functionalized rubbers was assessed by various methods (notched Charpy, perforation impact) as a function of temperature (T=23 and −40°C). The notched Charpy tests served to deduce the fracture toughness (K c ) and energy (G c ) data. It was established that EPDM‐g‐GMA is a slightly better impact modifier than is NBR‐g‐GMA albeit the latter polar rubber is more compatible with both matrices than the less polar EPDM‐g‐GMA. This finding was traced to the difference in the glass transition temperature (T g of NBR is higher than that of EPDM) and to the dispersion of the epoxy functionalized rubbers.