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Polyethylene, high-density relaxation transitions

Obtain DSC thermal curves of several semicrystaUine polymers such as polymethylmethacrylate (PMMA), polystyrene, polycarbonate, high-density polyethylene, low-density polyethylene and look for the glass transition in these polymers. The DSC run may need to be repeated twice with rapid cooling between runs. Many as received polymers will show a small peak on top of the glass transition on the first mn due to relaxation effects in the polymer. The second run should not show this peak , but only a step change in the baseline. Compare your values of Tg to literature values. Deviations may indicate the presence of plasticizers or other additives in the polymer. [Pg.1050]

HDPE High-density polyethylene Ta, Tp, Ty a, fi, y are relaxation transition... [Pg.304]

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Density relaxation

High-density polyethylen

High-density polyethylene

High-density polyethylene relaxation

Polyethylene density

Polyethylene relaxation

Polyethylene transitions

Relaxation transition

Relaxed densities

Transition density

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