One, PPO
PPO (polyphenylene oxide polyphenylene oxide) is an amber-colored transparent material, specific gravity and water is similar to 1.06.
1, combustion characteristics
refractory to combustion, extinguished from the fire, the flame is a thick black smoke, the plastic melted when the flowers and fruits stink.
2, the biggest advantage
has the highest glass transition temperature 210 ℃ in thermoplastic plastics, so it is very high temperature resistance; PPO has the ability to boil water at high temperatures, no deformation, no decomposition;
PPO hard and tough, high creep resistance. Its surface hardness is higher than PAPOMPC, creep is lower than these three materials; at lower temperatures -135 ℃ still has good elongation, dimensional stability; PPO can be metallized, that is, it can be electrically or vacuum coated;
PPO's dielectric properties are excellent, in a wide range of frequencies, temperatures, humidity, can be kept constant.
3, disadvantages
PPO in the case of organic solvents, there will be stress cracking; PPO is not climate-resistant, susceptible to sunlight discoloration; PPO liquidity is poor, difficult to process.
4, use
Because of the above advantages, PPO is most suitable for in the wet and loaded, that is, the need for excellent dielectric properties, but also high mechanical properties, and dimensional stability of the occasions: such as tuning sheet, microwave insulation.
Water treatment equipment, water distillation equipment, pump parts boil-resistant equipment, such as: medical equipment, food materials, high stiffness, high strength electrical enclosure and other parts, it is more advanced than PC shell material.
5, injection molding properties
PPO is a crystalline plastic, has a significant melting point, 217 ℃ when melting, but its viscosity is large, difficult to flow effectively, 360 ℃ on the decomposition; the general processing temperature of 280 ℃ - 340 ℃; PPO absorbent, in the presence of water, can cause decomposition, the need for drying can be dried at 140 ℃ drying 2-4 hours can be.
In addition, NORYL is a modified product of PPO, compared with PPO, its mechanical properties decline a lot, but also compared with PC, can be replaced.
Two, PPS
PPS is also known as polyphenylene sulfide, English name: polyphenylenesulfide, this color is a white material, it is highly crystalline, hard and brittle, excellent thermal stability, can be presented as a thermosetting plastics with high resistance to the characteristics. Pure PPS can not be injection molding, because it is too viscous, not easy to flow, injection molding PPS are modified, added a lot of fillers and modifiers, that is to say, injection molding PPS is modified PPS.
1, combustion characteristics
Non-combustible, off the fire and extinguished. However, when knocked against each other, a metallic "clanking" sound.
2, the biggest advantage
At higher temperatures, it can resist corrosion of any solvents;
PPS has high creep resistance, and other mechanical properties are also relatively high;
PPS at high temperatures, but also to maintain its mechanical properties and dimensions;
PPS's dielectric properties are excellent, in a wide range of frequencies, temperatures, humidity, are able to remain constant.
3, disadvantages
PPS poor fluidity, difficult to process.
4, use
Because of the above advantages, PPS is most suitable for high temperature and humidity and loaded conditions, as heat insulation, corrosion and insulation materials.
5, injection molding properties
PPS is a crystalline plastic, has a significant melting point, 280 ℃ when melting, but its viscosity is large, difficult to flow effectively, 400 ℃ when the decomposition; the general processing temperature of 300 ℃ - 340 ℃; PPO absorbent, in the case of moisture, can cause decomposition, the need for drying, can be dried at 140 ℃ can be 2-4 hours.
Three, PSF
PSF is a slightly amber-colored transparent material (there are also PSF is an ivory-colored opaque material), medium specific gravity, 1.24.
1, combustion characteristics
refractory to combustion, extinguished from the fire, the flame is a yellowish-brown smoke, the plastic combustion and melting and at the same time issued a rubbery smell of burnt.
2, the biggest advantage
has outstanding high and low temperature resistance; in 150 ℃, can still maintain its mechanical strength of 80%, in -100 ℃, can also maintain its mechanical strength of 75%;
PSF has outstanding creep resistance, which makes it a variety of mechanical strength to maintain a long-lasting;
PSF has outstanding High-temperature dielectric properties, at a high temperature of 190 ℃, in water, in moisture, can still maintain the dielectric properties;
PSF has outstanding resistance to amplitude radiation;
PSF can be metallized, that is, it can be electrically or vacuum coated.
3, disadvantages
PSF in will not be hydrolyzed, but in the case of high temperature and and load, the water will prompt it to stress cracking;
PSF fluidity is poor, difficult to process.
4, use
Because of the above advantages, PSF is most suitable for the manufacture of electrical and electronic components with precision tolerances, rigidity, thermal stability and good electrical insulation properties;
PSF is most suitable for the manufacture of the need to have thermal properties, chemical resistance, durability, rigidity of the parts;
PSF is not easy to hydrolyze at low temperatures, but can also be used for the manufacture of low temperature water treatment equipment parts. PSF is not easily hydrolyzed at low temperatures and can also be used to manufacture parts for low temperature water treatment equipment, water pump parts, water valves, washing machine parts, and it is a more advanced and highly rigid shell material than PC.
5, injection molding performance
PSF injection temperature is high 280-320, modified PSF and PC injection molding conditions are similar; baking temperature is similar to PC.
Four, polyarylate
Polyarylate is a transparent material.
1, combustion characteristics
Can be combustible, self-extinguishing after leaving the fire. It can produce a small amount of non-toxic smoke when burning. Representative grade: U-100.
2, the biggest advantage
Polyarylate without glass fiber reinforced that is excellent heat resistance;
Polyarylate without flame retardant can be self-extinguishing, combustion produces production of smoke, but non-toxic, in line with safety specifications. Polyarylate thermal expansion coefficient is small, the amount of creep is small, hygroscopicity is small, polyarylate resistant to acids and oils.
3, disadvantages
Polyester is not resistant to alkali and organic solvents.
4.Uses
Because of the above advantages, polyarylate is most suitable for household appliances.
5, injection molding properties
Polyarylate must be dried before processing, drying conditions are at a temperature of 100 ℃ -120 ℃, drying 4-6 hours, injection molding temperature of 330 ℃ -350 ℃.
V. Polyarylsulfone
1, combustion characteristics
Polyarylsulfone is a transparent material, polyarylsulfone is slightly heavier than polysulfone. It is represented by:Astrel360.
2, the biggest advantage
Heat resistance is much higher, the heat distortion temperature and continuous use to be about 100 ℃ higher than PSF. The mechanical strength of polyarylsulfone is similar to polysulfone.
3, disadvantages
Polysulfone mobility is poor, difficult to process
4, the use of
Because of the above advantages, to do ultra-high-temperature resistant materials used.
5, injection molding properties
Polyarylsulfone is the processing temperature of 320 ℃ - 410 ℃; mold temperature 232 ℃ - 260 ℃; it is more hygroscopic, absorbent, in the processing must be dried before drying conditions: 260 ℃ drying 2-4 hours can be.