The weather resistance and aging resistance of polyether esters.
Release time:
2022-04-11 12:01
Source:
Weather resistance and aging resistance
Polyether ester elastomers exhibit excellent chemical stability under various conditions such as water mist, ozone, and outdoor atmospheric aging. Like most TPEs, they degrade under ultraviolet light (with UV below 310nm being the main factor for degradation), so for outdoor applications or products exposed to sunlight, UV protection additives should be added to the formulation, including carbon black and various pigments or other shielding materials. The combination of phenolic antioxidants and benzotriazole UV stabilizers can effectively prevent UV aging.
Oxidation caused by light and heat are the two main factors for the degradation and aging of polyether ester elastomers. PEG-PBT copolyester has poor heat and light resistance, with severe thermal oxidative degradation and photodegradation. Increased temperature accelerates degradation. As the molecular weight decreases during aging, the material's elongation at break decreases, and the instantaneous elastic recovery rate worsens.
In addition, polyether ester elastomers also undergo varying degrees of hydrolysis, with crosslinking reactions occurring in water, leading to an increase in gel formation. PEG-PBT copolyester is used as a biomaterial scaffold implanted in the body, taking advantage of its easy hydrolysis and degradation characteristics. PEG-PBT copolyester degrades in water, following a hydrolysis mechanism where H2O molecules attack the ester bond between PEG and PBT, causing chain scission, with degradation products being PEG and low molecular weight PBT; the degradation rate is influenced by factors such as composition, temperature, pH, and enzymes, with higher PEG content, temperature, and pH leading to faster degradation rates. By adjusting the content of the two components, the degradation rate can be tailored to meet different application requirements.
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