Where two or more different monomers are polymerised together, the product will be a copolymer. The properties of the copolymer will be significantly dependent upon whether the two components have joined together in alternating, random or block sequences (Fig. 10.5).

More complex plastics can be produced for their specific physical properties by combining several components. Thus acrylonitrile butadiene styrene (ABS) is produced by the copolymerisation of the two precursor copolymers: styrene-acrylonitrile and buta-diene-styrene rubber.

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