Br. J. Appl. Phys.

1960

DOI: 10.1088/0508-3443/11/7/304

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Strength of irradiated drawn and undrawn nylon

Ariana Haynes³

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Effect of Initial Straining and γ Irradiation on Strength of Polyethylene

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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.

Effect of Initial Straining and γ Irradiation on Strength of Polyethylene

¹

,

²

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.

Anisotropy of Oriented Polymers

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1964

Journal of Applied Physics

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Effect of Reactor Irradiation on the Tensile Strength of Uniaxially Oriented Polyethylene Terephthalate

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1960

Journal of Applied Physics

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A series of uniaxially oriented polyethylene terephthalate fibers irradiated in a nuclear reactor have been investigated. On the basis of tensile studies the ultimate tensile strength is found to decrease as the dose of reactor irradiation increases. However, the ultimate tensile strength is found to increase when the degree of molecular orientation increases. But after the samples have received a relatively high dose of irradiation the tensile strength approaches practically zero. The x-ray diffraction scans of the nonirradiated samples with low degrees of orientation indicate very little crystallinity, whereas the very definite diffraction peaks associated with the irradiated and oriented samples indicate a definite trend toward crystallinity.

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