The Influence of Microwave Drying on Thermal-oxidation Ageing Properties of Nature Rubber Vulcanized
The thermal-oxidation ageing properties of nature rubber vulcanized dried by three methods was studied.TG and DTG was used to determine the thermal-oxidation degradation temperature in air atmosphere and thermal degradation active energy in N2 atmosphere using Coats-Redfern equation;the frequency sweep was used to estimate the ageing resistance of nature rubber vulcanized at strain of 0.5,also,the mechanical properties of rubber vulcanized was tested before and after ageing.Showed from the results,the mechanical properties of NR dried by microwave was higher than the hot-air drying and nature drying;the increasing value of tanδ in frequency sweep was larger than the other drying methods;the degradation active energy dried by microwave was 9 kJ/mol bigger than hot-air drying,so,the thermal stability of nature rubber dried by microwave was remarkably improved compared with the other two drying methods.