Polyphenylene sulfide (PPS) CAS#26125-40-6
Polyphenylene sulfide (PPS) is a high-performance engineering plastic composed of repeating p-phenylene sulfide units. It is a thermoplastic polymer with phenyl sulfide (–S–) groups along its main chain, typically having a molecular weight in the range of 10,000–50,000.
PPS is a branched, non-crystalline, and high-viscosity polymer. In its uncrosslinked form, it exhibits a linear structure; after crosslinking, it behaves similarly to a thermosetting material, although it can still soften to some extent upon heating and cooling, meaning it is not a true thermoset.
It is produced through the condensation polymerization of sodium sulfide and dichlorobenzene in a strongly polar solvent (such as ammonium hexamethyl phosphate) at 220–225°C. Common production methods include the McLafferty process, Friedel–Crafts process, p-monohalophenylene thiophenol salt condensation, and aromatic polyhalogenation with alkali metal sulfide solution.
PPS has a relative density of approximately 1.36 and is typically supplied as a white powder or granules. It is hard and brittle, with high crystallinity and a melt viscosity of 7.03–2.05 Pa·s at 303°C.
PPS is available in both low and high molecular weight grades. Low molecular weight PPS (molecular weight 4000–5000) has a high melt flow value (3000–4000), making it difficult to process directly; therefore, it usually requires crosslinking and the addition of glass fibers or inorganic fillers for applications such as injection molding, compression molding, and extrusion.
High molecular weight PPS, on the other hand, can be processed directly into plastic products without the need for crosslinking, offering greater processing convenience.
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| English Name | POLY(1,4-PHENYLENE SULFIDE) |
| English Synonyms | 3-[3-(1,1-BISHEXYLOXYETHYL)PYRIDIN-1-YL]PROPANE-1-SULFONATE;6-PPS; p-dichlorobenzene/ sodium s ulfide copolymer;1,4-dichloro-benzenpolymerwithsodiumsulfide(na2s); Benzene,1,4-dichloro-,polymerwiths odiumsulfide;Poly(phenyleneaulgide); POLY(1,4-PHENYLENE SULFIDE); POLY(PHENYLENE SULPHIDE) |
| CAS Number | 26125-40-6 |
| Molecular Formula | (C6H4CI2. Na2S)x |
| Molecular Weight | 225.05 |
| EINECS Number | 607-869-0 |
| Melting point | 285-300°C |
| Density | 1.36 g/mL at 25 °C |
| Form | powder |
| Color | Natural |
| InChI | InChI=1S/C6H4CI2.2Na.S/c7-5-1-2-6(8)4-3-5;;;/h1-4H;;; |
| InChIKey | RGOBIBWDGNKWML-UHFFFAOYSA-N |
| SMILES | S([Na])[Na].CIC1C=CC(=CC=1)CI |
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Product Application of Polyphenylene Sulfide (PPS)
Polyphenylene sulfide (PPS) resin is mainly used in engineering plastics, fibers, coatings, and films, with approximate market distribution of 80% plastics, 10% fibers, 5% coatings, and 5% films.
PPS alloys with high wear resistance and self-lubricating properties are widely applied in machinery, automotive, aerospace, and military industries.
Grades with excellent impact strength and flame retardancy are primarily used in the machinery, electronics, and automotive sectors, as well as in wire, cable, and communication industries.
Plastic-grade PPS accounts for the largest share and offers the broadest range of applications. Products made from PPS typically do not require additional flame retardants, feature low moisture absorption, and provide excellent electrical insulation, enabling them to resist corrosive media such as cleaning agents and soldering fluids.
PPS also exhibits strong adhesion, making it suitable for electronic packaging materials, including encapsulation of electronic components and integrated circuits.
In addition, PPS alloys can replace certain metal components in automotive applications, such as water tanks, carburetors, clutches, and oil pumps. They are also used in aerospace and commercial aircraft components, including landing gear and wing parts. Due to its physiological inertness, PPS is widely used in the food and pharmaceutical industries.
PPS coatings offer high density and excellent corrosion resistance, with a maximum service temperature of up to 300°C after crosslinking. They are widely used in petrochemical, pharmaceutical, food, military, and instrumentation industries, including applications such as pipes, valves, vessels, storage tanks, and non-stick cookware in corrosive environments.
PPS films, whether pure or composite (via lamination), are used in electrical insulation, electronic components, automotive parts, diaphragm materials, decorative materials, adhesive tapes, printer components, and heat-resistant food packaging, and can also be processed into conductive films.
PPS fiber demonstrates excellent heat resistance comparable to PET and PA resins. After stretching, its strength and modulus are significantly improved, enabling expanded applications in fibers and films. PPS fiber also features excellent chemical resistance (stable at 200°C), long-term thermal stability (200–220°C), flame retardancy (LOI ≥35), radiation resistance (≥1×10⁷ Gy), good mechanical properties, and strong electrical insulation, making it a high-performance functional fiber material.
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