Weatherability and Aging Resistance of Polyetherester
Release time:
2022-04-11 12:01
Source:
Weather resistance and aging resistance
Polyetherester elastomers have excellent chemical stability under many different conditions such as water mist, ozone and outdoor atmospheric aging. Like most TPEs, they degrade under UV light (UV below 310nm is a major factor in degradation), so for outdoor applications or products exposed to sunlight, UV protection additives, including carbon, should be added to the formulation Black and various pigments or other shielding materials. The combined use of phenolic antioxidants and benzotriazole UV shielding agents can effectively prevent UV aging.
Oxidation induced by light and heat are two major factors in the degradation and aging of polyetherester elastomers. PEG-PBT copolyester has poor heat resistance and light resistance, and the thermal oxidation degradation and photoaging degradation are very serious. Elevated temperature will accelerate degradation. As the molecular weight decreases during aging, the elongation at break of the material decreases and the instantaneous elastic recovery becomes poor.
In addition, the polyetherester elastomer also has different degrees of hydrolysis, and the polyetherester elastomer undergoes a cross-linking reaction in water, and the amount of gel formation increases. PEG-PBT copolyester is implanted in vivo as a biomaterial scaffold, taking advantage of its easy hydrolysis and degradation properties. PEG-PBT copolyester degrades in water and obeys the hydrolysis mechanism, that is, the H2O molecule attacks the ester group between PEG and PBT to cause chain scission, and the degradation products are PEG and low molecular weight PBT; the degradation rate is affected by composition, temperature, pH value, Influenced by factors such as enzymes, the higher the PEG content, temperature and pH value, the faster the degradation rate. By adjusting the content of the two components, the requirements for the degradation rate of different uses can be met.
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