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Effect of γ-irradiation on slow crack growth in a copolymer of polyethylene

✍ Scribed by Xici Lu; Norman Brown; Manal Shaker

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
411 KB
Volume
36
Category
Article
ISSN
0887-6266

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✦ Synopsis

The effect of ␥-irradiation on slow crack growth (SCG) in a medium density polyethylene (MDPE) was measured and compared with behavior of high density polyethylene (HDPE) and a recrystallized HDPE (RCHDPE). The three materials exhibited the same dependence on dose up to 3 Mrd. The HDPE became brittle above 50 Mrd. The resistance to SCG of MDPE and RCHDPE increased very rapidly with dose above 3 Mrd, until at 50 -80 Mrd their resistance to SCG became extraordinarily high. This high resistance to SCG was accompanied by a transition from crazing to shear deformation at the root of a notch. It was found that for the same concentration, crosslinks are more effective than short chain branches for increasing resistance to SCG.

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