English name: Phenylenesulfide proportion: 1.36 g/cm3 molding shrinkage rate: 0.7% molding temperature: 300-330 ℃. It is a kind of comprehensive performance of thermoplastic special engineering plastics, its outstanding characteristic is high temperature resistant, corrosion resistance and excellent mechanical properties. PPS is a sulfur-containing aromatic polymers, linear PPS in above 350 ℃ after cross-linked thermosetting plastics, branched chain type structure of PPS for thermoplastics. PPS is phillips, companies in the United States first realize industrialized production in 1971, after the patent expires, Japanese companies also began to research and development and production. Japanese companies typically have a Japan toray company, Japan at the present stage of production is greater than the yield. Other manufacturers are mainly concentrated in the United States, Japan and Europe.

Five global PPS producers for phillips, toray, tyco, treasure and big Japanese printing ink. Tianjin institute of synthetic materials in China, guangzhou chemical reagent factory, sichuan zigong chemical reagent factory, gao and guangzhou chemical industry institute of hebei engineering university had a test in a small amount, but are not stable and continuous production. At present domestic PPS vendors have Shanghai die chemical, by 2000, the world of PPS output can reach 50000 tons/year. PPS the maximum demand for Japan (33%), North America accounted for 32%, Western Europe accounted for 19%, the asia-pacific accounted for 16%.

PPS is a white powder, and the average molecular weight of 0.4-05000, density of 1.3 to 1.8 grams per cubic centimeter, PPS have excellent thermal performance. After adding glass fiber reinforced thermal performance index is higher, at 232 degrees Celsius by 5000 h after thermal aging, such as glass fiber, carbon fiber, filler to enhance its mechanical properties, such as modification of PPS can work in the long-term load and thermal load under the action of high mechanical properties and dimensional stability, and thus can be applied to the stress of the high temperature environment.

PPS dielectric constant is small, a low dielectric loss, surface resistivity and volume resistivity is not sensitive to the change of frequency, temperature, humidity, is a good electrical insulating material, its resistance to arc time is longer, the chemical stability of PPS is pretty good, in addition to the strong oxidizing acids, such as sulfuric acid, nitric acid and aqua regia erosion, it is not affected by the vast majority of acid and alkali salt erosion, is close to the chemical stability of PTFE. In less than 175 degrees does not dissolve in any known organic solvent, PPS will not appear when in contact with general organic solvent plastic cracking phenomenon.

Chemical resistance: can be found under 200 ℃ dissolve polyphenyl thioether solvent, the inorganic acid, alkali and salt resistance. No chlorinated biphenyls and oxidation resistance acid, oxidant, aqua regia, hydrogen peroxide and sodium hypochlorite, etc.

PPS good radiation resistance, resistant to radiation reached 1 x 108 Gy, is unmatched by other engineering plastics new material, in electronics, electrical, machinery, instruments, aviation, aerospace, military, etc. Especially the atomic bomb, bomb, is the only ideal excellent material as resistant to radiation.

The chemical structure of PPS itself is quite stable, and containing flame retardant elements - sulfur, therefore, PPS excellent flame resistance. Adjust specimens ignite, oxygen and nitrogen flow observation combustion situation. Specimens and just let continue to burn oxygen concentration is the limit oxygen index, the higher its value, said flame resistance, the better. Pure PPS limit oxygen index can be as high as 44, also has excellent flame resistance. Contain fillers or glass fiber PPS limit oxygen index is higher, the flame resistance is better.

Pure PPS when the thickness of 0.8 mm can be passed UL - 94 level where V0. Basically, except a few levels such as super toughening series, various grades of PPS UL94 burning sex are V - level 0, in UL 94 combustibility is already the best level. Super toughening series PPS contain some toughening agent, will sacrifice some flame resistance.

Pure PPS and not add conductive PPS grade with excellent electrical insulation properties. Add carbon fiber PPS level has a fairly low volume resistivity.