Polystyrene

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(No Transcript)
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Polystyrene
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Polyethylene
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Nylon 6,6
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PET - Poly(ethylene terephthalate)
The polar ester groups make for strong crystals.
In addition, the aromatic rings like to stack
together in an orderly fashion, making the
crystal even stronger.
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Polyketons
These polar carbonyl groups are attracted to each
other, and very strongly at that. This attraction
is so strong that while polyethlyene melts at
140 C, the polyketone doesn't melt until 255
C! This makes polyketone very strong but very
brittle.
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Shell has put the polyketone made with ethylene,
carbon monoxide, and a little bit of propylene on
the market and sells them under the name Carilon.
This polymer is tougher and less brittle.
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Carilon Thermoplastic Polymers
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SRI (nonprofit research institute) International
offers Carilon thermoplastic polymers for
multiple applications in the engineering
thermoplastic and fiber markets. Originally
developed by Shell Oil Company and now available
for license exclusively through SRI, Carilon
polymers offer superior strength, wear and low
permeability. These features make them ideal for
use in automotive parts electrical and
electronics systems business machines and
consumer appliances film, fiber and protective
coatings laboratory supplies, and industrial
applications. Representing the next wave in
high-performance polymeric materials, Carilon
plastics are based on a semicrystalline
thermoplastic technology, exhibiting performance
characteristics that are maintained even at high
temperatures. Carilon polymers offer a broad
range of features Outstanding chemical
resistance and low permeability Superior
strength, wear and friction characteristics
High resistance to fatigue, creep, swelling and
repetitive deformation Excellent balance of
stiffness and toughness over a wide temperature
range High-quality moldings at short cycle
times Resistance to a variety of fuels, organic
solvents and aggressive aqueous media Flame
retardancy
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Article Shell Abandons Carilon, Sells
Polyurethanes (Company Business and
Marketing)(Brief Article) Article from Chemical
Week Article date February 23, 2000
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Kevlar
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Kevlar
Kevlar is the trademark for a para-aramid
synthetic fiber, developed at DuPont in 1965.
This high strength material was first
commercially used in the early 1970s as a
replacement for steel in racing tires.
Currently, Kevlar has many applications,
ranging from bicycle tires and racing sails to
body armor because of its high tensile
strength-to-weight ratio It is 5 times stronger
than steel on an equal weight basis.
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Nomex is a trademark for flame-resistant
meta-aramid material developed in the early 1960s
by DuPont.