Thermoset plastics are synthetic materials which undergo a chemical change during processing to strengthen and set them into a form. Examples of thermoset plastics include epoxy, silicone, amino, phenolic and unsaturated polyesters.Continue Reading
Thermoset plastics are contrasted by thermoplastics, which soften when heated and strengthen and set into form as they are cooled. Thermoset plastics have a net-like structure of cross-linked polymers. Once they have undergone the initial chemical change during processing, they cannot be melted or remolded. They are also resistant to solvents.
Because of these basic properties, thermoset plastics are inherently strong and durable even under high-heat conditions, although they are somewhat brittle. These plastics are often used to make large and/or permanent parts or shapes such as automobile bodies. They are also used in electronic chips, polymer coatings, the coatings on eyeglasses and in dental fillings. Vulcanized rubber is another example of a thermoset plastic material.
Thermoset plastics are typically produced by heating a powder or liquid in a mold. The chemical change that sets the thermoset plastics may or may not have to do with the application of heat. In some cases, it is the result of the chemical interactions of the components. Each type of thermoset plastic has its own set of unique properties.Learn more about Thermodynamics
The heat change of fusion, or "delta H" of fusion, is determined by taking the number of moles of a substance and multiplying it by the molar heat of the substance. The equation is "?H = n?Hfus," where "n" is the number of moles.Full Answer >
The first law of thermodynamics sets the relationship of the change of internal energy as equal to the addition of heat minus the work a system completes. This is one of three laws that determines the characteristics of thermodynamics.Full Answer >
Enthalpy of fusion is the change in enthalpy when a specified quantity of a substance changes from solid to liquid when heated. It is also referred to as latent heat of fusion.Full Answer >
The energy required to change the temperature of a substance with no phase change is known as sensible heat. The change in temperature may come from the sun via the soil or the air.Full Answer >