After a certain period of time, the natural polymers degrade on their own but synthetic polymers do not. These are non-biodegradable polymersThe monomers are ethylene glycol and terephthalic acid or dimethýlterephthalate. When these monomers are mixed and heated at 500 K in the presence of zinc acetate and antimony trioxide catalyst, terylene (or dacron) is formed.
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