jeudi 23 janvier 2014

Synthetic Polymers: Different Types

By Lenna Stockwell


Appreciating synthetic polymers can be done because these are polymers made by man which have become highly useful. Polymers are molecules consisting of chains of multiple repeating units and are found naturally, as well as being created artificially. The DNA of human beings is a naturally occurring polymer, as well as all the important proteins in each of our bodies. The manufacture of synthetic polymers can be done and synthetic polymers can be grouped into four main groupings.

Synthetic fibers are one type of synthetic polymers and these have many interesting common properties. They generally resistant to chemicals, fungi and insects do not absorb moisture. They also typically cost much less to produce than a natural fiber, so this is why these fibers are used to replace fibers such as natural silk. A few common types of synthetic fibers include nylon, spandex and rayon.

Other types are the elastomers, a type of synthetic polymer with high elasticity, as the name suggests. Examples of products made from elastomers are shoe soles and tires, usually flexible products. Other types of elastomers are the silicone rubbers, elastomers often used as sealants.

Thermosetting plastics are also one of these types and these are the thermosets, another type of this synthetic polymer. This is a product that uses heat, and once set and dried, it is irreversible, and this is a type of synthetic polymer produced. The heating process is what will "cure" the product. These are products that are not recyclable although can also be shredded sometimes and used to make other products. Vulcanized rubber, those that are used to make tires are examples of these thermosetting plastics. Bakelite was one of the first highly popular thermoset plastics and these items, such as Bakelite jewelry, is highly collectable today.

On the flip side, there are thermoplastics and while this may sound very similar to thermoset plastics, there are some big differences. Thermoplastics do not undergo a chemical change when heat and this means that they can be melted many times and reused. In general, most types of thermoplastics do not biodegrade, but most are highly recyclable.

Thermoplastics are synthetic polymers used in making thermoplastic packages, and can run into millions each year. These are the custom packaging products made by many thermo forming companies. These are the water bottles and milk jugs and also the food containers used as food storage, made from thermoplastics. Aside from these custom made packages produced by the thermoforming companies, other products are made from this plastic type. One common type of thermoplastic is polyvinyl chloride, which is known simply as PVC and used to make many products, especially pipes.




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