Polyetherester has thermal properties
Release time:
2022-04-11 11:59
Source:
Thermal performance
If no antioxidant is added to the polyetherester thermoplastic elastomer, it will rapidly degrade under various conditions such as water mist, ozone, and outdoor atmosphere, thereby reducing the viscosity and relative molecular weight, and the elongation at break of the material. will decrease, and the instantaneous elasticity will recover. rate deteriorated. This degradation reaction of polyetherester is a free radical reaction, which may be due to the attack of carbon atoms in the polymer chain connected to the oxygen atom of polyether, and the polyetherester elastomer generates formaldehyde when the chain is cut, and formaldehyde is oxidized to formaldehyde. Formic acid, in turn, promotes chain scission. In order to improve the anti-oxidative degradation ability of the polyetherester elastomer, an appropriate stabilization method can be adopted, and the added stabilizer system should include a free radical scavenger, a peroxide decomposer and a formaldehyde scavenger.
Polyetherester elastomers have excellent heat resistance, the higher the hardness, the better the heat resistance. It has been reported in the literature that polyetherester elastomers do not lose weight when heated at 110 °C and 140 °C for 10 hours, and when heated at 160 °C and 180 °C for 10 hours, the weight loss is only 0.05% and 0.1%. The isokinetic heating curve shows that the polyetherester elastomer begins to lose weight at 250 °C, the cumulative weight loss is 5% at 300 °C, and there is a significant weight loss at 400 °C. Therefore, the upper limit temperature of polyetherester elastomer is very high, and the short-term use temperature is higher. High, can adapt to the baking temperature (150 ~ 160 ℃) of the automobile production line, and the loss of mechanical properties is small under high and low temperature. Polyetherester elastomer is used above 120℃, and its tensile strength is much higher than TPU.
In addition, polyetherester elastomers also have excellent low temperature resistance. The brittle point of the polyetherester elastomer is lower than -70℃, the lower the hardness, the better the cold resistance, and most polyetherester elastomers can be used for a long time at -40℃. Due to the balanced properties of polyetherester elastomers at high and low temperatures, it has a very wide operating temperature range and can be used from -70 to 200°C.
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