The molecular structure of rubber plays a decisive role in the heat resistance of the product, in the heat resistant rubber formula, generally choose varieties that are not easy to soften at high temperatures and have high thermal stability and chemical stability. The degree of softening at high temperatures depends on the polarity and rigidity of the macromolecule. All improvements in the polarity of rubber, such as the introduction of nitrile, ester, hydroxyl, chlorine, fluorine atoms and other polar groups in rubber molecules, help to improve heat resistance.
The thermal stability of rubber depends on the nature of the chemical bonds. The degree of main thermal reaction of polymerization is related to the structure of polymerization and the strength of chemical bond.
Reducing the number of weak bonds in rubber and improving its bond energy can improve the heat resistance. For example, replacing the carbon atoms on the main chain with heat-resistant inorganic elements, such as VMQ, etc., or using polymers with high bonding energy, such as FPM, etc., will obtain excellent heat resistance.