Addition Polymerisation The joining of two or more simple molecules or monomers, to form a new compound, a polymer which has the same empirical formula. Mechanism of the Polymerisation of Ethene Thousands of ethene molecules join up to form a type of poly(ethene) known as low density polythene. [CH2=CH2]n [ CH2-CH2 ]n number of joining molecules can vary from 200-2000 fig 1 The mechanism is known as a free radical reaction as it …
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