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Tensile creep tests, internal pressure tests, and scanning electron microscopy of electrical conduits of poly(vinyl chloride)
Author(s) -
Johansson Lennart,
Törnell Bertil
Publication year - 1987
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.760271906
Subject(s) - materials science , scanning electron microscope , composite material , ultimate tensile strength , fracture (geology) , creep , internal pressure , vinyl chloride , tensile testing , copolymer , polymer
Electrical conduits prepared from a mixture of suspension and emulsion poly(vinyl chloride) (PVC) resins were subjected to internal pressure tests at 60°C, covering a wide range of pressures. Some axial tensile creep tests were also carried out at the same temperature. As expected, the ability to withstand internal pressure decreased when the amount of lubricant was increased above the level used in normai commercial production. Fracture surfaces obtained in the two test methods were investigated by scanning electron microscopy. Incompletely melted primary particles or other fragments of resin grains were not observed in any of the fracture surfaces studied in this work. However, a peculiar skinlike structure was found in the fracture surfaces formed at intermediate stress levels in the internal pressure test. This structure was not observed in the fracture surfaces obtained in the notched tensile tests at constant load.