The morphology of wax films precipitated from different kinds of protective waxes in natural rubber/butadiene rubber sidewall compounds under different storage conditions was characterized by scanning electron microscopy,and the influences of environmental temperature and humidity on the morphology of wax films were studied.The results showed that the low-carbon number normal paraffins in the protective wax composition were easy to precipitate flake-shaped wax film at low temperature(4℃)and room temperature,and the high-carbon number normal paraffins and isoparaffins were easy to precipitate aggregated spherical wax film at 40℃.The alternation of temperatures from 40 to 20℃promoted the precipitation of high-carbon number paraffins,facilitating the formation of a continuous aggregated spherical wax film.Humidity variation at high temperature had little effect on the morphology of wax film.
scanning electron microscopyprotective waxsidewall compoundcarbon number distributionwax film morphologystorage conditiontemperature
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