How classify COMPOSITE MATERIALS? A simple scheme for classifying composite materials consists of three divisions: 1. Particle-reinforced composites. Particle-reinforced composites are subdivided into large-particle reinforced and dispersion-consolidated. This distinction is based on the consolidation or reinforcement mechanism. The term “large” is used to indicate that the matrix-particle interactions cannot be described at …
Thermoplastics Processing Methods
Thermoplastics are materials which soften when heated and can then be formed whilst soft. After cooling they becoming rigid take up the applied form. The softening and forming processes are reversible. Thermoplastics are probably the most widely used type of polymer. The group includes most of the “commodity” plastics such as polyethylene, PVC, polypropylene, nylons (polyamides) and polystyrene. Not all thermoplastics can be processed by all the methods. This table is a guide to what thermoplastics can be processed by each method.
Thermosetting Processing Methods
Thermosetting materials are materials that are formed whilst warm or hot but once formed they set in the formed shape. Cooling and reheating do not make thermosetting materials go soft again. The forming process is not reversible. Thermosetting materials were the first type of polymer to be produced e.g. bakelite, but are still widely used for many applications. Typical thermosetting materials are phenol formaldehyde resins, urea formaldehyde resins, epoxy resins and most rubbers.
Polymer academy: https://polymeracademy.com/plastic-processing-techniques/
Compression molding is a process of molding in which a feeding material is placed into an open, heated mold cavity. The mold is then closed with a top plug and compressed with large hydraulic presses in order to have the material contact all areas of the mold. The charge cures in the …
What is a Thermoset? Thermoset plastics, or thermoset composites, are synthetic materials that strengthen when heated, but cannot successfully be remolded or reheated after initial heat-forming or molding. After thermosets are molded, the resulting parts offer protection against high operating temperatures, corrosion, and chemical resistance. These material property benefits allow molded thermoset …