- 密度:
- 0.99
, extremely high impact resistance. The impact strength of ultra-high molecular weight polyethylene is related to its molecular weight. When the molecular weight is less than 10,000, as the molecular weight increases, the impact strength increases, reaching a peak around 10,000. After this peak, the impact strength will decrease if the molecular weight increases again. . This is because the molecular chain often hinders its optical crystallization, so that there are large amorphous regions in the macromolecules that can absorb large impact energy.
According to literature, the impact strength values of ultra-high molecular weight polyethylene and other plastics are measured according to the method. From the comparison, it can be concluded that the normal temperature impact resistance of ultra-high molecular weight polyethylene can be divided into polycarbonate, which is famous for its impact resistance. Comparable to esters and used in commonly used engineering plastics. Ultra-high molecular weight polyethylene still has excellent impact resistance even at low temperatures. Even at liquid and gas temperatures, it can still maintain good impact resistance. This excellent low-temperature characteristic makes ultra-high molecular weight polyethylene Applications extend to cryogenic engineering.
Very low friction coefficient. Ultra-high molecular weight polyethylene is very wear-resistant, has a low friction coefficient and good self-lubricating properties. It is an ideal material for bearing sleeves, sliders and linings.
Using ultra-high molecular weight polyethylene as friction parts of equipment can not only improve the wear-resistant life, but also achieve energy saving effects.
, good corrosion resistance.
, Very low water absorption. Ultra-high molecular weight polyethylene has a very low water absorption rate. It absorbs almost no water and does not swell in water. It is much less absorbent than nylon.
, thermal properties. According to the (load./) method, the heat distortion temperature is, under a smaller load, the use temperature can reach up to It is a material with excellent toughness, so its low-temperature resistance is also very good. It still has a certain degree of ductility at low temperatures without any signs of brittleness.