Description of natural rubber

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

Usually, what we call natural rubber refers to the elastic solid material made from natural rubber latex collected from Brazil rubber tree through coagulation, drying and other processing procedures. Natural rubber is a kind of 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 acid, 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 structural unit of macromolecular chain of natural rubber is isoprene, and the macromolecular chain is mainly composed of polyisoene. The content of rubber It accounts for more than 97%. There are aldehyde groups on the molecular chain, and there is one on average in each macromolecular chain. The viscosity increases during storage, and there are epoxy groups on the macromolecular chain of natural rubber, which is more active.

The macromolecular end of natural rubber is inferred to be generally dimethylallyl, and the other end is pyrophosphate. The end groups, aldehyde groups of the molecular chain and polymerized elements are very few. In terms of the molecular weight and distribution of natural rubber, Its molecular weight has a wide range. 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 megapascals.