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Sulfone Polymers
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- Sulfones are amorphous
engineering thermoplastics noted for high heat-deflection temperatures
and outstanding dimensional stability. These strong, rigid
polymers are the only thermoplastics that remain transparent at service
temperatures as high as 400°F.
- Natural color of the
sulfone resins is transparent light amber. Continuous use in air or in
steam at rated temperature does not cloud, craze, or otherwise destroy
their transparency. These resins are also available in opaque colors and
in mineral-filled and glass -reinforced
compounds, which provide improved strength, stiffness, and thermal
stability.
- Heat aging of the polymers
increases tensile strength, beat-deflection temperature, and modulus of
elasticity
appreciably. However, prolonged heat aging (about a year) decreases
toughness, tensile strength, and elongation. Unnotched specimens of the
sulfones are
extremely tough and do not break in standard impact tests.
- Sulfone polymers exhibit
varying levels of chemical compatibility, depending upon their polymeric
structure and the presence of additives such as glass.
- The sulfone polymer
family, which includes UDEL polysulfone, RADEL A polyethersulfone, and
RADEL R polyphenylsulfone are amorphous resins that combine excellent
thermal stability, high strength and toughness, excellent hydrolytic
stability, transparency, and good resistance to environmental
stress cracking.
- Sulfone polymers can be
processed following standard methods for injection molding, extrusion,
and blow molding . Shapes can be machined for prototype
evaluations; film and sheet can be thermoformed on conventional
equipment.
- Sulfone polymers will
absorb moisture, and although they are hydrolytically stable, they
should be dried before processing.
- There are several types of
molds that can be used to mold sulfone resins . These include two-plate,
three-plate, and hot-runner systems . All of these can contain manual or
hydraulic slides and other required features .
- Sulfone resins can be
extruded onto wire using a semitubing or tubing crosshead die . Wire
inlet temperatures should approximate that of the polymer melt . High
drawdown of the polymer melt tube can be achieved with sulfone resins .
- Solvay Advanced Polymers
is a global leader in sulfone polymer development, serving the needs of
customers in demanding industries such as healthcare, aerospace,
automotive, membranes and plumbing.
- Sulfonation with sulfuric
acid, chlorosulfonic acid, sulfur trioxide, and acetyl sulfate easily
provides proton -
conducting polymer electrolytes, but these sulfonated polymer
electrolytes decompose on heating above 200
deg cel because of desulfonation.
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