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Biaxial self‐reinforcement of isotactic polypropylene prepared in uniaxial oscillating stress field by injection molding. I. Processing conditions and mechanical properties
Author(s) -
Chen LiMin,
Shen Kaizhi
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20001209)78:11<1906::aid-app80>3.0.co;2-l
Subject(s) - materials science , composite material , ultimate tensile strength , polypropylene , tacticity , molding (decorative) , izod impact strength test , stress (linguistics) , reinforcement , stress–strain curve , stress field , polymer , deformation (meteorology) , structural engineering , finite element method , linguistics , philosophy , engineering , polymerization
This research explores the longitudinal and latitudinal mechanical properties of injection‐molded isotactic polypropylene (iPP) prepared in a uniaxial oscillating stress field by oscillating packing injection molding (OPIM). The methods, processing conditions, and mechanical test results for iPP by conventional injection molding (CIM) and OPIM are described. The mechanical properties in the flow direction (MD) and transverse direction (TD) of the OPIM moldings indicate three types of self‐reinforced iPP moldings. The pronounced biaxially self‐reinforced iPP specimens exhibit a 55–70% increase of the tensile strength and more than a fourfold increase of the impact strength in the MD, together with more than a 40% increase of the tensile strength and a 30–40% increase of the impact strength in the TD. The OPIM moldings show different stress–strain behavior in the MD and TD. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1906–1910, 2000