Polyether esters have thermal properties.
Release time:
2022-04-11 11:59
Source:
Thermal performance
If no antioxidants are added, thermoplastic elastomers of polyether ester will rapidly degrade under various conditions such as water mist, ozone, and outdoor atmosphere, leading to a decrease in viscosity and relative molecular weight, and a reduction in the material's elongation at break. The instantaneous elasticity will deteriorate. This degradation reaction of polyether ester is a free radical reaction, possibly due to the attack on the carbon atoms in the polymer chain connected to the oxygen atoms of the polyether. When the polyether ester elastomer undergoes chain scission, formaldehyde is produced, which is oxidized to formic acid, further promoting chain scission. To improve the antioxidant degradation capability of polyether ester elastomers, appropriate stabilization methods can be employed, and the added stabilizer system should include free radical scavengers, peroxide decomposers, and formaldehyde scavengers.
Polyether ester elastomers have excellent heat resistance, with higher hardness resulting in better heat resistance. Literature reports that polyether ester elastomers do not lose weight when heated at 110°C and 140°C for 10 hours, and the weight loss is only 0.05% and 0.1% when heated at 160°C and 180°C for 10 hours. Isothermal heating curves indicate that polyether ester elastomers begin to lose weight at 250°C, with a cumulative weight loss of 5% at 300°C, and significant weight loss at 400°C. Therefore, the upper temperature limit of polyether ester elastomers is very high, and they can withstand even higher short-term use temperatures, adapting to the baking temperatures of automotive production lines (150-160°C), with minimal loss of mechanical properties at high and low temperatures. When used above 120°C, their tensile strength is much higher than that of TPU.
In addition, polyether ester elastomers also exhibit excellent low-temperature resistance. The brittleness point of polyether ester elastomers is below -70°C, with lower hardness resulting in better cold resistance. Most polyether ester elastomers can be used long-term at -40°C. Due to the balanced performance of polyether ester elastomers at high and low temperatures, they have a very wide working temperature range, usable from -70 to 200°C.
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