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The production and properties of oriented polypropylene laminates
Author(s) -
Chen H. J.,
Kortschot M. T.,
Leewis K. G.
Publication year - 1994
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760341211
Subject(s) - materials science , composite material , polypropylene , toughness , transverse plane , modulus , isotropy , composite laminates , structural engineering , composite number , physics , quantum mechanics , engineering
The mechanical properties of isotactic polypropylene can be enhanced in one direction by a combination of rolling and drawing in a rolling mill. The longitudinal strength and modulus of the oriented polypropylene (OPP) increases with an increase in draw ratio; however, the transverse properties remain relatively unchanged. In this study, multidirectional OPP laminates [with (0) 2 , (0/90) s and (0/±45) s lay‐ups] were made to obtain sheet materials with improved properties in more than one direction in the plane. A hot‐plate welding technique was used to produce these translucent and recyclable laminates. The in‐plane properties of the laminates were successfully predicted with classical laminate theory (CLT), which is commonly used to predict the properties of fiber reinforced materials. These laminates can be quasi‐isotropic and were found to have improved modulus [up to 6 GPa for (0/90) s laminates] and strength [up to 150 MPa for (0/90) s laminates] as well as exceptionally good impact toughness.