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The effect of additives and drawing temperature on gamma‐ or ultraviolet‐radiation induced oxidative degradation of drawn high density polyethylene

1986; Wiley; Volume: 26; Issue: 7 Linguagem: Inglês

10.1002/pen.760260706

1548-2634

Teoman Tinçer, İsmail Çimen, G. Akay,

Polymer Nanocomposite Synthesis and Irradiation

Abstract The effects of drawing temperature and the presence of various types of additives on gamma and ultraviolet radiation induced oxidative degradation of high density polyethylene have been studied. Uniaxial drawing of the polymer was conducted at 60, 80, and 100°C. The additives were an antioxidant, light stabilizer, and carbon black, used in various combinations, Oxidative degradation was followed from carbonyl formation by IR spectroscopy. It is found that at a given draw ratio, the oxidative degradation is retarded when the drawing temperature is increased, irrespective of whether or not the polymer contains any additives in any combination. This is due to the decrease of the surface and/or bulk microcracks formed during the drawing process at high temperature. Carbon black/antioxidant mixtures were shown to be antagonistic, while a carbon black/light stabilizer mixture resulted in a synergetic effect in drawn or undrawn materials.