Abstract
The spin-probe method was used to investigate the structure of composites prepared by blending of polyethylene with various contents of silica. When compared to original polyethylene, the temperature T 50G was found to be lower at low filler content (4.7, 9.1%), but higher at high filler content (16.6, 25.9%). A relation between T 50G and T g, as derived by A. T. Bullock [1], was used to calculate free volume of the composites in question at temperature T g ( v fg). Average free volume was found to be much higher in samples with low silica content than in original PE, whereas at higher filler content the probe molecules are bound to the filler surface and Bullock's equation can not be applied.
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