Analysis of common characteristics of pps plastic materials

PPS, or Polyphenylene Sulfide, is a white powder with an average molecular weight ranging from 0.4 to 0.5 million and a density between 1.3 and 1.8 grams per cubic centimeter. One of the most remarkable features of PPS is its exceptional thermal performance. When reinforced with glass fiber, its thermal stability is significantly enhanced, allowing for continuous use at temperatures up to 400°C. Even when heated to 500°C, PPS exhibits minimal weight loss, and it fully degrades at around 700°C. Its mechanical properties remain relatively stable even as temperature increases. After 5,000 hours of heat aging, PPS retains more than 50% of its original flexural and tensile strength. While the inherent tensile and flexural strengths of PPS are moderate among engineering plastics, its elongation and impact resistance are quite low. To improve its mechanical performance, additives such as glass fiber, carbon fiber, or fillers are often added. These modifications greatly enhance key mechanical properties like tensile strength, bending resistance, compressive strength, and impact resistance, while slightly reducing elongation. Modified PPS maintains high mechanical performance and dimensional stability under long-term heat and load conditions, making it suitable for high-temperature applications. PPS also exhibits excellent electrical insulation properties. It has a very low dielectric constant and dielectric loss, and its surface and volume resistivity remains stable regardless of frequency, temperature, or humidity. This makes it an ideal material for electrical insulation. Additionally, PPS shows strong resistance to electric arcs and maintains its insulating properties over time. Chemically, PPS is highly stable. It is resistant to most acids, bases, and salts, except for strong oxidizing agents like concentrated sulfuric acid, nitric acid, and aqua regia. It is insoluble in any known organic solvent below 175°C and does not cause cracking or degradation when exposed to common solvents. Due to its molecular structure, which consists of alternating benzene rings and sulfur atoms, PPS has inherent flame-retardant properties. It can achieve a UL-94 V-0 rating without the need for additional flame retardants. Its limiting oxygen index ranges from 44% to 53%, similar to PVC, making it self-extinguishing. PPS is also highly resistant to ultraviolet light and radiation, remaining stable and non-degrading when exposed to these elements. Despite its many advantages, PPS has some limitations, including poor toughness, low impact strength, and insufficient melt viscosity, which can make processing challenging. This article is reproduced from the Plastic Raw Materials website: http://yuancailiao.pvc123.com/. Please indicate the source. Editor: Hardware Business Network Information Center, http://news.chinawj.com.cn

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