Polyurethane (PU) elastomers are widely used in numerous industries due to their excellent mechanical properties and high chemical resistance. In cold climates, however, PU elastomers can become brittle and lose their elasticity, making them unsuitable for applications in low-temperature environments. To overcome this challenge, researchers have developed new generations of PU prepolymers specifically designed for cold weather conditions.
One such example is the use of polyether polyols, which offer superior low-temperature properties compared to polyester polyols. By increasing the molecular weight of the polyols and incorporating a higher percentage of hard segments, researchers have created PU elastomers that can withstand temperatures as low as -60°C without losing their elasticity or mechanical strength.
Table 1. Physical properties of PU elastomers at different temperatures
Temperature (°C) Tensile Strength (MPa) Elongation (%)
25 30 500
-30 27 420
-60 25 320
As shown in Table 1, the tensile strength and elongation of the PU elastomers remain relatively stable even at extremely low temperatures. This demonstrates the effectiveness of the new PU prepolymers in retaining their mechanical properties under cold weather conditions.
In addition to their improved low-temperature properties, PU elastomers with polyether polyols offer excellent hydrolytic stability and resistance to chemical degradation. This makes them suitable for applications in harsh environments, such as oil and gas extraction, marine engineering, and transportation.
Furthermore, the new PU prepolymers can be synthesized using a variety of raw materials, including natural oils and renewable resources. This creates a more sustainable option for industries that require high-performance elastomers in cold climates.
In conclusion, the development of PU prepolymers with polyether polyols has opened up new opportunities for industries operating in cold weather climates. These elastomers offer superior mechanical properties at low temperatures, excellent hydrolytic stability, and can be synthesized using renewable resources. With the continued innovation in PU elastomers, we can expect to see more versatile and sustainable options in the future.
