Comparison of intrinsic characteristics and properties of natural rubber from different origins

Molecular weight and its distribution, gel content, nitrogen and phosphorus content, wet strength, Mooney viscosity, mechanical properties and aging resistance of three kinds of domestic raw natural rubber were compared with those of imported ribbed smoked sheet. The results showed that among the four kinds of natural rubber, the imported ribbed smoked sheet had the highest molecular weight with a narrower distribution, the highest nitrogen content, moderate phosphorus content and gel content, the best wet strength, the highest Mooney viscosity, and better tensile properties, but the highest compression fatigue heat generation; The product of Chinese Academy of Tropical Agricultural Sciences had moderate molecular weight and its distribution, the highest gel content, better wet strength, the lowest Mooney viscosity, the largest elongation at break and tear strength, and the best aging resistance; The product of Hainan Natural Rubber Industry Group Co Ltd had the lowest molecular weight with a narrower distribution, lower nitrogen content, the highest phosphorus content, poor wet strength, and good aging resistance, but the shortest scorch time. The product of Yunnan Natural Rubber Industry Group Co Ltd had higher molecular weight with the widest distribution, the lowest gel content and nitrogen and phosphorus content, poor wet strength, and the worst aging resistance, but the longest scorch time and the lowest compression fatigue heat generation.