Polyetheretherketone was the first industrially produced variety. A special engineering plastic with excellent comprehensive properties. It has excellent heat resistance, water resistance, solvent resistance and electrical insulation. Radiation resistance is the best among all plastics.
PA12 is also known as polylaurolactam, a semi-crystalline thermoplastic material. PA12 is a good insulating material and will not absorb water. PA12 has a very low melting point and density, has a small specific gravity and is a soft nylon plastic with low shrinkage. Nylon 12 has a good noise damping effect, and can be used for silent gears. The injection temperature of nylon 12 is 240-300 degrees.
PPSU has a scientific name as polyphenylene sulfone resins. It is a novel thermoplastic engineering plastic, which refers to a polymer compound containing a sulfone group and an aromatic nucleus in the main chain of the molecule, and it is non-crystalline. PPSU has the properties of high transparency and high hydrolytic stability and can withstand repeated steam sterilization.
This engineering thermoplastic has great mechanical strength and has been rated high-performing in its semi-crystalline attributes. Its semi-crystalline nature allows for good performance under intense heat, low moisture retention and good resistance to harsh chemicals.
Isopropylidene can reduce the intermolecular force, giving the polymer certain flexibility and good melt processability. The non-polar methyl side chain makes the polymer less hygroscopic. The electrical properties are improved, but the heat resistance of the polymer is unfavorable, so that heat distortion temperature and maximum continuous use temperature of PSU are all lower than PPSU and PES.
As a large amount of engineering plastics, polyamide is widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and other fields. It has become an indispensable structural materials in various industries, and its main features are as follows.