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Thermosetting plastics (thermosets) are polymer materials that irreversibly cure, to a stronger form. The cure may be done through heat (generally above 200 degrees Celsius), through a chemical reaction (two-part epoxy, for example), or irradiation such as electron beam processing.
Thermoset materials are usually liquid or malleable prior to curing and designed to be molded into their final form, or used as adhesives.
The curing process transforms the resin into a plastic or rubber by a cross-linking process. Energy and/or catalysts are added that cause the molecular chains to react at chemically active sites (unsaturated or epoxy sites, for example), linking into a rigid, 3-D structure. The cross-linkingprocess forms a molecule with a larger molecular weight, resulting in a material with a highermelting point. During the reaction, when the molecular weight has increased to a point so that the melting point is higher than the surrounding ambient temperature, the material forms into a solid material.
Uncontrolled reheating of the material results in reaching the decomposition temperature before the melting point is obtained. Therefore, a thermoset material cannot be melted and re-shaped after it is cured. This implies that thermosets cannot be recycled, except as filler material.[1]
Thermoset materials are generally stronger than thermoplastic materials due to this 3-D network of bonds, and are also better suited to high-temperature applications up to the decomposition temperature of the material.
What else can I help you with?
What material is used to make a tractor?
Like an auto, steel is the most common material of tractors. However many parts are made of plastics, fabrics and rubber for those huge tireslike an auto, steel is the most common material of tractors. However many parts are made of plastics, rubber and fabrics.
What is a weld?
A weld is the fusing of materials by melting. Metals, glass, and some plastics can be welded. Not to be confused with brazing, soldering, or glueing.
What types of material would have a yield point?
all materials that are ductile, including almost all metals and plastics. Those materials that are brittle, like glass and ceramics, do not have defined yield points; they simply break
What is the yield strength of polycarbonate plastic?
The yield stress of any plastic is usually not use to describe the material because all plastics yielding stress is a function of the rate at which it is loaded and its temperature. For example if you leave something like silly putty on the corner of a table it will eventually creep over the edge of the table under its own weight, but if you cool it down to can use it to hit nails into wood. Same thing applies to poly-carbonate and other plastics just to a lesser extent. Often the ultimate stress is used to determine if a plastic will fail but even that assumes that the plastic is a room temperature.
What materials are used for crane?
If we are talking of an industrial lifting crane, the likely materials are steel for the structural elements, copper steel and plastics for an electric motor to drive it, and bronze or aluminium in some of the thrust bearings. The whole thing might be coated with an oil-based paint, or perhaps a coating based on an epoxy resin.
What type of plastics are thermo plastics?
three types of thermo plastics are POLYETHENE.....,POLYPROPYLENE........and.......POLYVINYL CHLORIDE(PVC)
Do thermo plastics of cross links between chains?
Thermosetting plastics
Differences between thermo plastics and thermotesting plastics?
THERMOSETTING can be heated and shaped ONCE THERMO can be heated an manipulated time and time again
What is the difference between thermo plastics and set plastics?
thermo can be heated and manipulated unlited timed, but set can only be heated and manipulated once
Can you show thermo plastic and thermoset plastics?
no
How are thermo set plastics made?
i am trying to find that out myself
Which plastic is used for coating on uniforms of fireman?
thermo plastics
Two types of plastics?
thermoset which can withstand higher temperatures in comparison to the other type thermo plastics
What are thermo-setting plastics used for?
They are used for making plastic's but the plastics they make aren't biograble
What are the two types of plastic that start with thermo?
The two types of plastics that start with thermo are thermoset plastic and thermoplastics plastic.hope that helps you! x
What objects are made out of thermo plastics?
Examples of thermosetting plastics (or just thermosets) include amino, epoxy, and phenolic and unsaturated polyesters.
Can we substitute thermosetting plastics with thermo plastics?
Thermoplastics are the only ones that can be recycled. Thermosets cannot be recycled.
