Polyphenylene sulfide grades

There is no true correlation between the two methods as we can see in Figure 3.5, which displays the notched versus un-notched impact strength of various grades of polycarbonates, acrylics, polyphenylene sulfide and nylon. 

The UL rating depends on the exact grade and the sample thickness. For the same grade of polyphenylene sulfide, the UL ratings are ... 

When the temperature rises, polyphenylene sulfide can be attacked by hot strong acids and bases, chlorinated solvents, oxidizing agents, halogens, amines. For example, a given grade is unusable after a few months in 10% nitric acid at 90°C. After 1 year at 90°C in 37% hydrochloric acid, the retention of tensile strength is 29%. 

Polyphenylene sulfides are good insulators even in a hot environment, with high dielectric resistivities and low or moderate loss factors. Special grades are marketed for electrical applications. 

A commercial process for polyphenylene sulfide, (-( S-)x, was developed in 1967 by the reaction of para-dichlorobenzene and sodium sulfide in a polar solvent (1)- This polymer is very versatile. Selected grades can be used for extrusion and for production of a wide range of injection molding compounds. Typical properties of a 40% glass-reinforced compound are given in Table I. 

This paper Is concerned primarily with three basic grades of polyphenylene sulfide (1) 40X glass-filled polymer (Grade R-4),... 

Reinforced plastics are composites in which a resin is combined with a reinforcing agent to improve one or more properties of the resin matrix. The resin may be either thermosetting or thermoplastic. Typical thermosetting resins used in RPs include unsaturated polyester, epoxy, phenolic, melamine, silicone, alkyd, and diallyl phthalate. In the field of reinforced thermoplastics (RTFs), virtually every type of thermoplastic material can be, and has been, reinforced and commercially molded. The more popular grades include nylon, polystyrene, polycarbonate, polyporpylene, polyethylene, acetal, PVC, ABS, styrene-acrylonitrile, polysulfone, polyphenylene sulfide, and thermoplastic polyesters. 

The miniaturization of PCBs has created the need for connectors to be made fi-om special materials suitable for shaping into thinner parts that can be packed into higher-destiny spaces and that can withstand higher soldering temperatures. Such materials available on the market include tailored grades of polyphenylene sulfide (PPS), PEEK, PET, polyetherimide, sulfone-based alloys, and liquid crystal polymers. Well-known commercial products are Rynite FR-530 and FR-945 modified PET grades of Du... 

Polyphenylene sulfide is a high temperature, stiff, fire-resistant, chemically resistant plastic, which has a very low melt viscosity and accepts fillers and reinforcing agents very well. Talc, china clay, dolomite, quartz and glass fibre filled grades are all available but volumes are very small and the situation changes very rapidly. 

Polyphenylene sulfide containing up to 30% glass fiber has recently become available in thermoformable grades. In addition to its remarkable tensile, flexural, and impact properties, this composite can be formed to a depth of 6 in. [23]. 

RYTON polyphenylene sulfide resins and compounds are engineering thermoplastics developed by Phillips Petroleum Company. Available in both molding and coating grades, these materials feature excellent dimensional stability, inherent flame retardancy, thermal stability, chemical resistance, desirable electrical properties and ease of processing. 

Experience has shown that upper service temperatures are permissible up to 270 °C under short-term load (several hours) and up to 240 °C under constant load (months to years). The temperature indices for injection-molding grades of differently modified polyphenylene sulfide according to UL 746 as a function of minimum thickness are ... 

Table 3.1 shows continuous use temperatures for engineering and high performance polymers. For comparative purposes, 30% glass fibre-reinforced grades have been selected. PEEK has the highest continuous use temperature of up to 260 C, followed closely by liquid crystal polymers. Other high performance polymers are polyphthalamide (PPA), polyamideimide (PAI), polyarylimide, polyphenylene sulfone (PPSU), polyphenylene sulfide (PPS), polyetherimide (PEI), polysulfone (PSU), polyethersulfone (PES). 

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