Abstract
The properties of polypropylene containing 2, 5, 10, and 15% alkali sulfate lignin have been studied by the method of capillary viscometry at temperatures of 190, 230, and 250°C. It has been shown that introducing lignin, irrespective of the concentration, leads to an increase in the Newtonian viscosity of the melt and to an increase in the weighted-mean molecular weight. An analysis of the apparent relative activation energy of viscous flow shows that the greatest effect is obtained by introducing from 2 to 5% lignin. The results obtained permit a hypothetical conclusion concerning the mechanism of the crosslinking process (possible "ladder" structure).
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