Biodegradable plastics will degrade over time and turn back into base materials without any extra intervention from people or a supply of oxygen. Compared to petro-chemical plastics, the main difference between a biodegradable plastic and petrochemical plastic relates to carbon. Petroleum based plastics hold carbon after being formed. After they are disposed of, that carbon is slowly released back into the atmosphere through degradation or melting to be recycled. Biodegradable plastics do not release any carbon back into the environment after use. Carbon isn’t used in the initial manufacturing, and isn't a byproduct as it degrades.
Polybutylene succinate (PBS) is an aliphatic polyester with characteristics comparable to polypropylene. One major difference is that PBS will degrade naturally and result in water and CO2 being introduced into the environment. PBS is made from succinic acid, which is an organic chemical common to most living organisms. PBS is frequently used in food packaging, packaging for cosmetic products, medical implants, and dissolvable drug encapsulation. PBS is also often blended with Polyactic acids (PLAs) to modify characteristics concerning strength and impact resistance without changing affecting thermal or tensile properties.
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