pps plastic raw material is a thermoplastic engineering plastic containing a benzothio group in its main chain, belonging to the polyether plastics category. It was industrialized in the United States in 1968, with the main industrial production methods being solution polymerization and self-polycondensation. The molecular structure of pps reveals that it is a linear or slightly branched high polymer composed of alternating benzene rings and sulfur atoms, with strong overall molecular chain integrity. The main chain, connected by rigid benzene rings and flexible thioether chains, exhibits a balance of rigidity and flexibility, allowing for crystallization and high melting points. Secondly, due to the conjugation of the benzene ring with the sulfur atom and the unsaturation of the sulfur atom, oxidation can convert the thioether bond into a sulfoxide group, or form oxygen bridge branching or cross-linking between adjacent macromolecules, resulting in excellent thermal and oxygen stability. Thirdly, the polarity of the sulfur atom is conjugated by the benzene ring and confined by high crystallinity, making pps non-polar or weakly polar, thus highlighting its excellent electrical insulation, dielectric properties, and resistance to chemical media. Fourthly, due to its good compatibility with numerous polymers and additives, pps can be modified by various means to enhance its mechanical properties and other characteristics.
Properties of PPS Plastic Raw Material
The enhanced thermal performance of glass fiber-reinforced material boasts a continuous use temperature of up to 400 degrees Celsius. PPS exhibits excellent thermal stability, showing minimal weight loss up to 500 degrees and complete degradation at 700 degrees. Its mechanical properties decline very little with temperature increases. After 5000 hours of thermal aging at 232 degrees, its flexural and tensile strengths can still retain over 50%. The tensile and flexural strengths of PPS are average among engineering plastics, while its elongation and impact strength are low. Consequently, PPS is often reinforced with additives such as glass fiber, carbon fiber, or fillers in load-bearing components to enhance its mechanical properties. After modification, PPS sees a significant improvement in its primary mechanical properties like tensile and flexural strength, compressive and impact strength, although elongation decreases. Modified PPS maintains high mechanical and dimensional stability under long-term and thermal load conditions. It remains insoluble in any known organic solvents below 175 degrees Celsius, and it does not exhibit cracking when in contact with general organic solvents.
pps plastic raw materials, composed of alternating benzene rings and sulfur atoms in the molecular chain, inherently possess flame-retardant properties. Therefore, no flame retardant needs to be added to achieve the UL-94-VO level. Their limiting oxygen index ranges from 44% to 53%, similar to PVC, and they are self-extinguishing plastics. PPS is also highly stable against ultraviolet radiation and other forms of radiation, without experiencing surface sticking or decomposition upon exposure.
The main shortcomings of pps plastic raw materials include poor toughness, low impact strength, and insufficiently stable melt viscosity.
