Effect of Temperature and Reactor Irradiation on the Strength of Biaxially Oriented Polyethylene Terephthalate

Haynes, Ariana; Hsiao, C. C.

doi:10.1063/1.1735467

Journal of Applied Physics

1960

DOI: 10.1063/1.1735467

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Effect of Temperature and Reactor Irradiation on the Strength of Biaxially Oriented Polyethylene Terephthalate

Ariana Haynes

C. C. Hsiao

Abstract: Samples of biaxially oriented polyethylene terephthalate irradiated in a nuclear reactor have been investigated at five temperature levels ranging from − 150°F to 350°F. In general, from tensile studies, the ultimate tensile strength was found to decrease markedly to a relatively low magnitude upon receiving a reactor irradiation dose having a thermal neutron bombardment component of 1018 nvt and over. The modulus of elasticity for both the irradiated and nonirradiated samples was found to increase with the de… Show more

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1962

1990

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Weld lines in injection moulded polypropylene parts. Mechanical properties morphology relationships

Wenig¹,

Singh²,

Botzen³

et al. 1990

Angew. Makromol. Chem.

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The morphology of polypropylene plaques containing a weld line, has been investigated by x-ray wide and small angle scattering, light scattering and polarization microscopy. The results are correlated to mechanical values obtained from tensile tests. While the lamellar morphology is of neglectable influence, it is found, that the mechanical properties of the samples are strongly influenced by the spherulitic structure. Clustering of &type spherulites and strong morphological inhomogeneities in the vicinity of the weld line are the primary reason for the mechanical weakening of the plaques. The temperature of the mould has a strong effect on the spherulitic structure and thus on the tensile properties of the samples. ZUSAMMENFASSUNGDie Morphologie von Polypropylen-SpritzguBteilen mit Bindenaht wurde mit R6ntgenweit-und Kleinwinkelstreuung, Lichtstreuung und Polarisationsmikroskopie untersucht. Die erhaltenen morphologischen Daten wurden mit mechanischen Werten aus Zugversuchen korreliert. Es wird gefunden, daJ3 die mechanischen Eigenschaften der untersuchten Proben im wesentlichen von der Sphtirolithstruktur beeinflat werden. Anhaufungen von Spharolithen mit Kristallen der hexagonalen $-Modifikation und eine starke Inhomogeniat der Spharolithstruktur senkrecht zur Bindenaht sind der wesentliche Grund fur die verschlechterten mechanischen Eigenschaften. Diese Spharolithstruktur wird durch die Temperatur des SpritzguBwerkzeugs stark beein-fluDt. Die Lamellen-Uberstruktur hat dagegen einen vernachlassigbar kleinen EinfluD auf das mechanische Verhalten.

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Weld lines in injection moulded polypropylene parts. Mechanical properties morphology relationships

Wenig¹,

Singh²,

Botzen³

et al. 1990

Angew. Makromol. Chem.

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Effect of Initial Straining and γ Irradiation on Strength of Polyethylene

Hsiao

Yang

1962

Journal of Applied Physics

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Uniaxially and biaxially oriented samples of polyethylene irradiated by γ rays have been investigated at room temperature. Both the tensile strength and the modulus of elasticity are found to increase as the degree of orientation induced by homogeneous deformation increases. But the tensile strength decreases as the dose of γ irradiation increases while the modulus of elasticity increases. The combined effects seem to indicate that the γ irradiation essentially destroys the macromolecular orientation and thus reduces the tensile strength to that of unoriented solid, but with relatively higher elastic modulus as a result of the occurrence of crosslinking.

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Effect of Temperature and Reactor Irradiation on the Strength of Biaxially Oriented Polyethylene Terephthalate

Cited by 2 publications

References 2 publications

Weld lines in injection moulded polypropylene parts. Mechanical properties morphology relationships

Weld lines in injection moulded polypropylene parts. Mechanical properties morphology relationships

Effect of Initial Straining and γ Irradiation on Strength of Polyethylene

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