Explanation

The degree of crosslinking between vulcanized rubber molecules. The molecular structure of elastomer is a network structure formed by crosslinking of molecular chains. The degree of crosslinking of the network is called crosslinking density or degree of crosslinking. There are three description methods for degree of crosslinking: ① density of net chain, number of net chains in unit volume N/V, N is the total number of net chains in materials, and V is the volume of materials; ② The molecular weight of the net chain Mr, the average molecular weight of the chain segment between the two cross-linking points; ③ crosslinking point density; The number of crosslinking points per unit volume is related to the number of effective chains per unit volume. The curing degree is affected by vulcanization time, temperature and the amount of vulcanizing agent. curing degree is closely related to the physical and mechanical properties of rubber products.

Classification