FLOW PROPERTIES OF THERMALLY DEPOLYMERIZED LIQUID NATURAL-RUBBER

The flow behavior of liquid natural rubber (LNR) with reference to the effect of molecular weight, shear rate, and temperature has been stud ied. LNR samples were prepared by thermal depolymerization of rubber ( NR) through the combined effect of mechanical, chemical, and thermal e nergies. High molecular weight samples, especially at lower temperatur es, showed pseudoplastic behavior, whereas the low molecular weight sa mples were Newtonian at all temperatures. The viscosity of LNR conside rably decreases with increase in temperature. The activation energy of flow was also calculated. (C) 1995 John Wiley & Sons, Inc.