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Author Zhang, Hui ♦ Zhang, Zhong ♦ Park, Hyung Woo ♦ Zhu, Xing
Source SpringerLink
Content type Text
Publisher SP Higher Education Press
File Format PDF
Copyright Year ©2008
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences
Subject Keyword fracture ♦ toughness ♦ ductility ♦ nanocomposites ♦ nanoparticles ♦ polypropylene (PP) ♦ Materials Science
Abstract We prepared surface-modified TiO$_{2}$ nanoparticle (21 nm)/polypropylene nanocomposites using a twinscrew extruder and an injection molding machine. The TEM (transmission electron microscopy) and SEM (scanning electron microscopy) images showed homogeneous dispersion of nano-TiO$_{2}$ at 1 vol.% filler content and weak nanoparticle matrix interfacial adhesion. It was found that the essential work of fracture (EWF) approach, usually characterizing fracture toughness of ductile materials, was no longer applicable to the nanocomposite samples because of the extreme crack blunting and tearing processes observed in the EWF tests. As an alternative approach, the specific essential work-related yield was used for assessment of the plane-strain toughness, as suggested in the literature. The results indicated that the addition of 1 vol.% nano-TiO$_{2}$ did not toughen the polypropylene (PP) matrix at all. On the other hand, it was observed from the EWF tensile curves that the nanoparticles enhanced the ductility of the PP matrix greatly, the reason of which was probably ascribed to the high level of molecular orientation of the injection molded samples, as revealed by the polarized optical microscopy (POM). Because of the highly ductile behavior induced by the nanoparticles, the fracture energy achieved two-to three-fold increase, depending on the ligament lengths of the samples. The difference between the toughness and ductility of nanocomposites was discussed.
ISSN 16737377
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2008-03-20
Publisher Institution Chinese Universities
Publisher Place Heidelberg
e-ISSN 16737482
Journal Frontiers of Materials Science in China
Volume Number 2
Issue Number 1
Page Count 7
Starting Page 9
Ending Page 15

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Source: SpringerLink