Radiation resistance order of radiation resistance rubber

        Long-term radiation of various rays is an important reason for the deterioration of polymer products, so it is very important to improve the radiation resistance of materials. The radiation resistance of the polymer is related to its molecular structure, molecular weight and aggregation state. It does not absorb certain rays, or the polymers that absorb the rays and produce photocrosslinking have good radiation resistance, such as polystyrene and polyethylene. In contrast, polymers that decompose after radiation are less resistant to radiation, such as butyl rubber. In addition, preventing the entry of rays or quenching the excited free radicals caused by radiation is also an important means to improve radiation resistance. Introducing stable structures into polymer molecules can form intrinsic radiation-resistant polymers, and adding stabilizers to polymers can It constitutes a composite radiation-resistant material. Some additives that can play the above-mentioned functions include light shielding agents, excited state quenchers, and light antioxidants. Polymer materials such as rubber, after being irradiated by high-energy rays, produce molecular chain scission or cross-linking reactions.

        The order of radiation resistance of radiation-resistant rubber is as follows: polyurethane rubber>natural rubber>styrene-butadiene rubber>nitrile-butadiene rubber>chloroprene rubber>silicone rubber>fluorine rubber>butyl rubber. Fillers with good radiation resistance include lead oxide, antimony pentasulfide, barium sulfate, and better plasticizers include high aromatic oil and dibutyl phthalate. P-phenylenediamine antioxidants have anti-radiation oxidation. It is used in nuclear reactor installations, aerospace installations, radiation protection articles for medical use and protective clothing, etc.