The temperature-time function of the mechanical strength and ageing of polyethylene

The influence of mechanical forces on structural changes in commercial grades of high and low density polyethylenes was investigated by using extremely high shear rates (>2 × 104S−1) during processing in a special injection molding machine and by long‐term loading at ambient temperature. Changes in molecular weight distribution (MWD) and the degree of long‐chain branching (LCB) were followed by gel permeation chromatography and viscometry. No effect of the mechanical forces was observed either in the long‐term loading or in the processing. At temperatures exceeding 280°C the small changes noted in MWD and LCB wrere found to be entirely due to thermal de radation.

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On the effect of mechanical energy on the degradation of polyethylene in the solid state and in the melt

Holmström

Andersson

Sörvik

1977

Polymer Engineering & Sci

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Weathering of polymers: mechanisms of degradation and stabilization, testing strategies and modelling

White

Turnbull

1994

Journal of Materials Science

263

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Plasticization of polyvinylchloride and the time dependence of the strength characteristics of the plasticized product

Natov

Gancheva

1970

Polymer Science U.S.S.R.

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The temperature-time function of the mechanical strength and ageing of polyethylene

Cited by 6 publications

References 3 publications

On the effect of mechanical energy on the degradation of polyethylene in the solid state and in the melt

On the effect of mechanical energy on the degradation of polyethylene in the solid state and in the melt

Weathering of polymers: mechanisms of degradation and stabilization, testing strategies and modelling

Plasticization of polyvinylchloride and the time dependence of the strength characteristics of the plasticized product

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