Polypropylene
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A thermoplastic vinyl polymer exhibiting high tensile strength, resistance to solvents, and superior temperature stability. Long polymer chains exhibit these properties because the long chains tend to randomly orient themselves within the compound (often referred to as highly amorphous), and become extremely entangled. This can be visualized by imagining a tangled mass of shoe laces - pulling out any individual shoe lace is more difficult as the mass become more entangled.
Thermoplastic materials such as polypropylene can go through many temperature change cycles without any appreciable chemical change. They are created from polymers, which are long, repeating chain of atoms formed through the linkage of many monomer molecules, which are small molecule that may become chemically bonded to other monomers. Polypropylene is inexpensive to manufacture and quite robust, and has found to be quite useful in a variety of products, speaker cones among them. It offers a low cost solution as a material that exhibits strength, rigidity, high internal loss, moldability, and excellent resistance to environmental influences such as moisture, UV radiation, fatigue, and temperature. |
