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The development of surface texture in injection stretch‐blow molded polypropylene
Author(s) -
White S. A.,
Doun S. K.
Publication year - 1992
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.760321905
Subject(s) - polypropylene , materials science , extensional viscosity , composite material , rheology , texture (cosmology) , molding (decorative) , cracking , viscosity , extensional definition , optical microscope , crazing , development (topology) , blow molding , polymer , scanning electron microscope , paleontology , mold , image (mathematics) , artificial intelligence , biology , computer science , shear viscosity , tectonics , mathematical analysis , mathematics
The development of surface texture in biaxially deformed polypropylene is examined. Two polypropylenes formed into bottles under similar conditions by the injection stretch‐blow molding process exhibit different levels of clarity. Vertical cracks of light scattering dimensions are found by optical microscopy to be the source of haze. Rheological measurements indicate the resin that develops surface cracking has a much higher extensional viscosity and exhibits a significant increase above the linear case of its extensional stress growth function. Possible mechanisms for the formation of surface texture are discussed.