Influence of molecular weight on J-integral testing of polypropylene

The J-integral tests of several kinds of polypropylene (iPP) and rubber modified PP(RPP) with different molecular weight were carried out and the fracture toughness compared with the Izod impact strength. In order to interpret the different dependence on molecular weight between the fracture toughne...

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Bibliographic Details
Published in:Polymer testing 1999-01, Vol.18 (2), p.135-149
Main Author: Fukuhara, N.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Mechanical properties
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:The J-integral tests of several kinds of polypropylene (iPP) and rubber modified PP(RPP) with different molecular weight were carried out and the fracture toughness compared with the Izod impact strength. In order to interpret the different dependence on molecular weight between the fracture toughness and the Izod strength, the new Resistance-Curve (R-Curve) resolution scheme is proposed. According to this resolution scheme, the J IC of PP corresponds to the fracture toughness of the net crack growth energy (NCG) part and the discrepancy between the J IC and Izod impact strength upon molecular weight dependence is attributed to whether the deformation energy of the craze area and the surrounding plastic region (DCP) contributes or not.
ISSN:0142-9418
1873-2348
DOI:10.1016/S0142-9418(98)00021-X