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Mechanical properties and impact toughness of talc‐filled β‐crystalline phase polypropylene composites
Author(s) -
Tjong S. C.,
Li R. K. Y.
Publication year - 1997
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.10171
Subject(s) - talc , materials science , composite material , polypropylene , ultimate tensile strength , toughness , scanning electron microscope , izod impact strength test , filler (materials) , phase (matter) , chemistry , organic chemistry
Injection molded β‐crystalline phase polypropylene (PP) composites containing 5, 10, 20, 30 and 40% (by weight) of talc filler were studied by X‐ray diffraction, scanning electron microscopy, static tensile and falling drop weight impact tests. The X‐ray diffraction analysis showed that the talc filler suppresses the formation of β‐form PP dramatically. As a result, the β‐PP composites containing talc content ≥20 wt% consisted mainly of the α‐form PP phase. The tensile test showed that the addition of talc filler up to 40 wt% leads to an increase in Young's modulus whereas little effect is observed on the yield strength of composites with the addition of talc up to 30%. This behavior can be attributed to the load bearing effect of talc particles with a platelike structure and to good interfacial bonding exists between the matrix and filler. The impact tests revealed that the critical stain energy release rate (G c ) of the β‐PP polymers appears to increase initially with the addition of 5 wt% talc; thereafter it decreases significantly with increasing talc content.