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.Know More
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
A battery's power, or the electrical current that it can provide, is greatly reduced when the temperature drops. A typical car battery, for example, has about 50 percent of its starting power at 0 degrees Fahrenheit when compared with its operation at 80 degrees Fahrenheit.Full Answer >
Temperature increases the reaction rate by increasing the number of collisions and making more forceful collisions. A rise in temperature is an increase of motion and energy, so collisions happen more often and more violently, resulting in product formation.Full Answer >
A poor conductor of heat is any material that can not transfer heat. Poor conductors have a low density thus the particles in a given volume of the material are not enough to collide and transfer heat. Examples of poor heat conductors include air, wood, paper, cloth and water.Full Answer >
Enthalpy is calculated by summing up the energy changes taking place in individual steps of a chemical process. To arrive at the enthalpy changes, Hess’s law is employed. It states that the enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs.Full Answer >