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Addition polymerisation is the process in which the same small molecules called monomers react together to form one long molecule, known as a polymer.
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Addition polymerisation is the process in which the same small molecules called monomers react together to form one long molecule, known as a polymer. This can be summarised by a general equation: ....A+A+A+A....›....-A-A-A-A-... An addition polymerisation reaction usually takes place at a high temperature and pressure and under the presence of a catalyst. These variables control the properties of the polymer. An example of an addition polymerisation reaction is that of ethene to form poly(ethene). The temperature and pressure control the level of side branching in the polymer, which greatly affect its properties. Ldpe is made at a high temperature and pressure, which increases side branching. The polymerisation of ethene can be separated into three stages: initiation, propagation and termination. Stage 1: Initiation R• + H2C=CH2 › R-CH2-CH2• This is the start of the reaction. R• represents a radical; it reacts with an ethene...
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