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Polystyrene and Styrofoam
A History of Polystyrene and Styrofoam
This popular
packing material can be injected, extruded or blow molded
By Mary
Bellis
Polystyrene is a strong plastic created from
ethylene and benzene.
It can be injected, extruded or blow-molded.
This makes it a very useful and versatile manufacturing material.
Most of us recognize polystyrene in the form of
styrofoam used for beverage cups and packaging peanuts.
However, polystyrene is also used as a building
material, with electrical appliances (light switches and plates) and in other
household items.
German apothecary Eduard Simon discovered
polystyrene in 1839 when he isolated the substance from natural resin.
However, he did not know what he had discovered.
It took another organic chemist named Hermann Staudinger to realize that
Simon's discovery, comprised of long chains of styrene molecules, was a plastic
polymer.
In 1922, Staudinger published his theories on
polymers. He stated that natural rubbers were made up of long repetitive chains
of monomers that gave rubber its elasticity.
He went on to write that
the materials manufactured by the thermal processing of styrene were similar to
rubber.
They were the high polymers, including
polystyrene. In 1953, Staudinger won the Nobel Prize for Chemistry for his
research.
BASF Commercial Use of Polystyrene
Badische Anilin & Soda-Fabrik or BASF was
founded in 1861.
BASF has a long history of being innovative due
to having invented synthetic coal tar dyes, ammonia, nitrogenous fertilizers as
well as developing polystyrene, PVC, magnetic tape and synthetic rubber.
In 1930, the scientists at BASF developed a way
to commercially manufacture polystyrene.
A company called I.G. Farben is often listed as
the developer of polystyrene because BASF was under trust to I G. Farben in
1930.
In 1937, the Dow Chemical Company introduced
polystyrene products to the U.S. market.
What we commonly call styrofoam, is actually the
most recognizable form of foam polystyrene packaging.
Styrofoam is the trademark of the Dow Chemical
Company while the technical name of the product is foamed polystyrene.
Ray McIntire: Styrofoam Inventor
Dow Chemical Company scientist Ray McIntire
invented foamed polystyrene aka Styrofoam.
McIntire said his invention of foamed
polystyrene was purely accidental. His invention came about as he was trying to
find a flexible electrical insulator around the time of World War II.
Polystyrene, which already had been invented,
was a good insulator but too brittle. McIntire tried to make a new rubber-like
polymer by combining styrene with a volatile liquid called isobutylene under
pressure.
The result was a foam polystyrene with bubbles
and was 30 times lighter than regular polystyrene. The Dow Chemical Company
introduced Styrofoam products to the United States in 1954.
How Foamed Polystyrene/Styrofoam Products Are
Made
Foamed polystyrene starts as small spherical
beads that contain an expanding agent called hydrocarbon.
The polystyrene beads are heated with steam. As
the expanding agent boils, the beads soften and expand up to forty times their
original size.
The expanded beads are left to cool down before
being heated again. However, this time the beads are expanded within a mold.
The molds are designed in a variety of shapes
depending on the desired end product. Examples are things such as styrofoam
cups, cartons, wig stands and more.
The beads completely fill the mold and also fuse
together.
Styrofoam is about 98% percent air.
Mary
Bellis
Inventions
Expert
Introduction
New
York-based film producer and director
Singled
out by Forbes magazine for her writing on inventors.
Known
in art and independent film circles by the name CalmX
Creator
of computer-generated art
Experience
Mary
Bellis was a former writer for ThoughtCo, where she covered inventors for 18
years. She was a freelance writer, film producer, and director. In addition, Forbes Best of the Web credited
her for creating the number one online destination for information about
inventors and inventions. Her writing has been reprinted and referenced in
numerous educational books and articles. She was known for her short
independent films and documentaries,
including one on Alexander Graham Bell. She specialized in making and
exhibiting computer-generated art, while working as an animator, journalist and
an independent video game developer.
Education
Mary
Bellis held a Master of Fine Arts in film and animation from the San Francisco
Art Institute.
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