Description of Natural Rubber

Natural rubber (NR) is a natural polymer compound with cis-1,4-polyisoprene as the main component, and 91% to 94% of its components are rubber hydrocarbons (cis-1,4-polyisoprene). Diene), the rest are non-rubber substances such as protein, fatty acid, ash, sugar, etc. Natural rubber is the most widely used general-purpose rubber.

Usually, what we call natural rubber refers to the elastic solid material made from natural latex collected from the Brassica napus through coagulation, drying and other processing procedures. Natural rubber is a natural polymer compound with cis-1,4-polyisoprene as the main component. Its rubber hydrocarbon (cis-1,4-polyisoprene) content is more than 90%, and it also contains A small amount of protein, fatty acids, sugar and ash, etc.

Natural rubber microstructure:

The structure of natural rubber is mainly the chain structure of macromolecules, molecular weight and its distribution and aggregation structure. The macromolecular chain structural unit of natural rubber is isoprene, and the macromolecular chain is mainly composed of polyisoene. It accounts for more than 97%, and there are aldehyde groups on the molecular chain, and each macromolecular chain has an average of one. It is the aldehyde group that is condensed or reacted with protein decomposition products to form branching and cross-linking, which makes rubber. The viscosity increases during storage, and there are epoxy groups on the natural rubber macromolecular chain, which are more active.

The macromolecular end of natural rubber is generally inferred to be dimethylallyl, and the other end is pyrophosphate group. The end group, the aldehyde group of the molecular chain and the polymerized elements are very few. In terms of the molecular weight and distribution of natural rubber, Its molecular weight range is wide. According to foreign reports, most of the molecular weights are around 30,000. The strength of natural raw rubber, mixed rubber and vulcanized rubber is relatively high. Generally, the strength of natural rubber can reach three MPa.