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Tensile properties and morphology of PP/EPDM/glass bead ternary composites
Author(s) -
Liang J. Z.,
Li R. K. Y.,
Tjong S. C.
Publication year - 1999
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10367
Subject(s) - materials science , composite material , ultimate tensile strength , polypropylene , maleic anhydride , volume fraction , ternary operation , epdm rubber , scanning electron microscope , natural rubber , polymer , copolymer , computer science , programming language
Abstract The tensile properties of three types of injection molded glass bead (GB) filled polypropylene (PP)/ethylene‐propylene‐diene monomer (EPDM) ternary composites have been determined at room temperature by using an Instron materials testing machine. The effects of the filler surface treatment, the glass bead (GBI) pretreated with a silane coupling agent and the EPDM (EPDM‐MA) modified with a maleic anhydride, and the filler content on the tensile mechanical properties of the ternary PP composites have been investigated. The Young's modulus ( E c ) increases while the yield stress (σ yc ) and tensile fracture strength (σ bc ) of the composites decrease with increasing the volume fraction of glass beads (ϕ g ) when the volume fraction of EPDM is constant (ϕ e = 10%). The ( E c ) values of PP/EPDM/GBI and ϵ bc for PP/EPDM‐MA/GB2 (no surface pretreated) systems are the highest at the same ϕ g . The tensile fracture energy ( E bc ) and tensile fracture strain (ϵ bc ) of PP/EPDM/GBI and PP/EPDM/GB2 systems appear to peak at ϕ g = 25%. However, the E bc and ϵ bc of PP/EPDM‐MA/GB2 system show little changes with increasing ϕ g . The fracture surfaces of ternary composites have been examined in a scanning electron microscope. The correlation between the tensile properties and morphologies of these materials have been discussed.