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Why Don't Plastics Degrade?
Plastics belong to a chemical family of polymers they are made up of a long chain of molecules containing repeated units of carbon atoms. Because of this inherent molecular stability (high molecular weight), plastics do not easily breakdown into simpler components. However plastics do decompose though not fully and that too over a long period of time (100 to 500 years). Commercially available plastics (polyethylene, polypropylene, etc) have been further made resistant to decomposition by means of additional stabilizers like anti oxidants.
The only way to get a plastic to break down is to re-engineer their chemical composition(polymerisation or synthesis) or to use oxidants.
Oxidants by themselves have limitations in breaking the long carbon chains to smaller constituents. That process of breaking the chain to very small constituents can only be through anaerobic biodegradation.
Anaerobic biodegration is the process by which mircrobes break down the polymer chains into simpler consituents of carbon, hyrogen and oxygen. These constituents can be easly absorbed into the environment.
Plastics that can be broken down through anaerobic biodegradation are called biodegradable plastics. Environ (from KAYSONS www.kaysons.in) is such a biodegradable plastics, that can be used to make biodegradable bags as well as biodegradable paper cups.
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