What is polyphenylene sulfide used for?
PPS is used in filter fabric for coal boilers, papermaking felts, electrical insulation, film capacitors, specialty membranes, gaskets, and packings. PPS is the precursor to a conductive polymer of the semi-flexible rod polymer family.
What causes glass transition?
When the temperature drops to near or below the Tg, for polymers the party’s over, and the long-range segmental motion grinds to a halt. When this long-range motion ceases, the glass transition occurs, and the polymer changes from being soft and pliable to being hard and brittle.
What is glass transition?
The glass transition is the phenomenon in which a solid amorphous phase exhibits more or less abrupt changes in derivative thermodynamic properties such as heat capacity or thermal expansion: when an amorphous material changes from a solid state to a liquid state on heating or from a liquid to a solid-like state on …
Is PPS Food Safe?
Engineered for food and beverage applications, Solvay food-safe Ryton polyphenylene sulfide (PPS) polymers are suitable for applications such as food-industry appliance components that operate at temperatures up to 392°F, including parts for deep-oil fryers, coffee machines, ovens and microwaves.
How is polyphenylene sulfide made?
PPS is produced by reaction of sodium sulphide and dichlorobenzene in a polar solvent such as N-methylpyrrolidone and at higher temperature [at about 250° C (480° F)]. In the original process developed by Philips, the product obtained has a low molecular weight and can be used in this form for coating applications.
What is cold crystallization?
“Cold crystallization” is defined as an exothermic crystallization process taking place upon heating from a glassy, amorphous phase, which is often observed for polymeric materials below the melting temperature. (
What is the safest plastic for food?
Plastics that are safe to use as food storage containers include:
- Plastic #1: PET or PETE – (Polyethylene Terephthalate)
- Plastic #2: HDPE – (High Density Polyethylene)
- Plastic #4: LDPE (Low Density Polyethylene)
- Plastic #5: PP – (Polypropylene)
Is polyphenylene Sulfclable recyclable?
During the polyphenylene sulfide recycling recycling processes, nothing is added, only taken away. No cross-contamination can occur. We disassemble and thoroughly clean our compact equipment systems before each new material is run, guaranteeing your valuable materials will not be contaminated.
What makes Polyphenylene sulfide a good thermoplastic?
PPS (PolyPhenylene Sulfide) is a semi-crystalline engineering thermoplastic. It offers the broadest resistance to chemicals of any advanced engineering plastic. There are no known solvents that effect PPS under 392º F, and it is inert to steam, strong bases, fuels, and acids.
What is the maximum crystallinity of polyphenylene sulfide?
Polyphenylene sulfide is an engineering plastic, a high-performance thermoplastic with a maximum crystallinity of 65 percent. Poly (phenylene sulfide) can be molded, extruded, or machined to high tolerances. In its pure solid form, it is an opaque white to light tan. Maximum service temperature is 218 °C.
Are there any solvents in poly phenylene sulphide?
It has no known solvents up to about 200°C (392°F). PPS is generally inert to the oil and gas environment and reactions of PPS with water, hydrocarbons, and gases are not observed. However, grades proposed for pipeline service are formulated to improve flexibility and low temperature impact strength.
Which is better, PPS unfilled or 40% glass?
At moderate temperatures PPS offers great dimensional stability and strength. The 40% glass reinforced grade of Quadrant PPS is the most recognized PPS. It is compression molded and offers better dimensional stability and thermal performance than the Techtron® PPS unfilled grade. It maintains its strength to above 425º F.