Polyphenylene sulfide (PPS) is a new type of high-performance thermoplastic resin with advantages such as high mechanical strength, high temperature resistance, chemical resistance, flame retardancy, good thermal stability, and excellent electrical performance. Widely used in the fields of electronics, automotive, machinery, and chemical engineering.

The characteristics of PPS are as follows:

1. Good chemical resistance.

2. Low creep rate.

3. Low water absorption rate.

4. Good dimensional stability.

5. High elastic modulus.

6. Flame retardant.

Polyphenylene sulfide (PPS), along with polyetheretherketone (PEEK), polysulfone (PSF), polyimide (PI), polyarylester (PAR), and liquid crystal polymer (LCP), are collectively known as the six major specialty engineering plastics.

Outstanding performance of PPS: good heat resistance, with a heat deformation temperature generally greater than 260 ℃, and can be used in the temperature range of 180-220 ℃. PPS is one of the best heat-resistant varieties in engineering plastics; Corrosion resistance is close to tetrafluoroethylene, and chemical resistance is second only to polytetrafluoroethylene; Excellent electrical performance; Excellent mechanical performance; Good flame retardant performance.

Shortcomings of PPS: The price is too high, which is a bottom line among high-temperature resistant materials, but much higher than general engineering plastics; Poor toughness and brittleness; Medium viscosity is unstable.

Pure PPS is rarely used due to its brittle performance, and the PPS used is mostly its modified performance varieties. Specifically, there are; 40% glass fiber reinforced PPS (R-4), inorganic filled PPS (R-8), carbon fiber reinforced PPS (G-6), etc. PPS is developing rapidly and is expected to become the sixth largest engineering material.

(1) General performance: PPS is a polymer with a white appearance, high crystallinity, hardness, and brittleness. The relative density of pure PPS is 1.3, but it increases after modification. PPS has a very low water absorption rate, usually only about 0.03%. PPS has good flame retardancy, with an oxygen index of over 44%. Compared with other plastics, it belongs to high flame retardant materials in plastics (pure PVA has an oxygen index of 47%, PSF is 30%, PA66 is 29%, MPPO is 28%, and PC is 25%).

(2) Mechanical properties: Pure PPS has low mechanical properties, especially low impact strength. After being reinforced with glass fiber, the impact strength will be significantly increased, from 27J/m to 76J/m, a threefold increase; The tensile strength increased from 6Mpa to 137Mpa, doubling. PPS has high rigidity. Rare in engineering materials. The bending modulus of pure PPS can reach 3.8 GPa, and after inorganic filling modification, it can reach 12.6 GPa, an increase of up to 5 times. PPO, known for its rigidity, is only 2.55Gpa, while PC is only 2.1Gpa. PPS has good creep resistance under load; High hardness; High wear resistance, with a modulus of only 0.04g at 1000 revolutions per minute, further improved after filling with F4 and molybdenum disulfide; PPS also has a certain degree of self lubrication. The mechanical properties of PPS are less sensitive to temperature.

(3) Thermal performance: PPS has excellent thermal performance, can withstand 260 ℃ in the short term, and can be used for a long time at 200-240 ℃; Its durability is comparable to PI, second only to F4 plastic, which is also rare in thermosetting plastics.

(4) Electrical properties: PPS has outstanding electrical properties. Compared with other engineering materials, its dielectric constant and dielectric loss angle are relatively low, and there is little change in frequency, temperature, and temperature range; PPS has good arc resistance, comparable to thermosetting plastics. PPS is commonly used as an electrical insulation material, which is also rare in thermosetting materials; Its usage accounts for about 30%.

(5) Environmental performance: One of the biggest characteristics of PPS is its good chemical corrosion resistance, and its chemical stability is second only to F4:

PPS is effective against most acids. Esters, copper, phenols, fatty acids, aromatic acids, chlorinated acids, etc. are stable and not resistant to chlorinated biphenyls, oxidizing acids, oxidants, concentrated sulfuric acid, concentrated nitric acid, aqua regia, hydrogen peroxide, and sodium hypochlorite. PPS has good radiation resistance.