Abstract
An aromatic polysulfone consists of 4,4’-diol aromatic compound and 4,4’-dichlorodiphenyl sulfone. As 4,4’-diol aromatic compounds, there exists bisphenol A, p-dihydroxy benzene, 4,4’-diphenol methane and p,p’-diphenol (bisphenol) and they were compared to study which compound would indicate the most resistant to gamma-ray exposure. Sulfur dioxide (SO2) from 4,4’-dichlorodiphenyl sulfone was used as an indicator for evaluation. The use of bisphenol in the preparation of polysulfone indicated the most resistant to the gamma-ray irradiation exposure and least production of SO2 among aromatic diol compounds tested. This indicated polysulfone free from bisphenol A is producible. The production of SO2 from bisphenol-based polysulfone was around 43% of bisphenol A based polysulfone. The rate of decrease of tensile strength correlated well with the order of radiation resistance. The fracture toughness of bisphenol A based polysulfone decreased with irradiation dose, but the bisphenol based polysulfone maintained its original ductility.
Highlights
Bisphenol A is known as an endocrine disrupter
When bisphenol A based polysulfone or bisphenol A based polycarbonate was sterilized with gamma-ray irradiation, autoclaving at 121.1°C for more than 20 min, or ozone gas exposure, bisphenol A was produced after cleavage of polysulfone or polycarbonate [1,2]
The major volatile product from the irradiation of bisphenol A based polysulfone at 150°C was sulfur dioxide (SO2 )which was produced with G (SO )=0.146.22
Summary
Bisphenol A is known as an endocrine disrupter. this compound is mostly used for production of polysulfone and polycarbonate in the field of medical device preparation. When bisphenol A based polysulfone or bisphenol A based polycarbonate was sterilized with gamma-ray irradiation, autoclaving at 121.1°C for more than 20 min, or ozone gas exposure, bisphenol A was produced after cleavage of polysulfone or polycarbonate [1,2]. There have been relatively few systematic studies of the relationship between polymer structure and radiation resistance for polymers with aromatic backbones. Such investigations are necessary to determine which linkages are the most susceptible to degradation by radiation exposure. All the polymers tested have similar molecular weights and molecular weight distributions, which allow the comparison of the change in mechanical properties with radiation and polymer structure to be a more defined structure/ property investigation
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