Influence of rubber type Different rubbers have differe […]
Influence of rubber type
Different rubbers have different ozone resistance. The main reasons for this difference are the content of unsaturated double bonds in their molecular chains, the characteristics of the double bond principle substituents, and the mobility of the molecular chains.
2. Effect of double bond content
The ozone-resistant rubber without C-C double bond on the main chain has far better ozone resistance than unsaturated rubber, especially silicone rubber, fluorine rubber and chlorosulfonated polyethylene rubber, and there is no sign of aging even after 3 years of exposure. Comparing the ozone aging resistance of butyl rubber and isoprene rubber, it can also be found that the low double bond content can also significantly improve the ozone aging resistance.Custom Rubber Stoppers Suppliers
3. Effect of intermolecular forces
Intermolecular forces, small molecular chains have high mobility, and ozone cracking is easy to occur and the crack growth rate is fast. This is because under the condition of a constant ozone concentration, if the molecular chain mobility is high, when ozone causes the surface molecular chains to break Later, the two ends of the fracture will separate from each other at a faster speed, revealing that the new molecular chain at the bottom continues to be attacked by ozone, thus accelerating the growth of the rift. On the contrary, ozone cracking is not easy to occur, and the crack growth is slow.