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How can one maintain a specific chain length in free radical propagation?
Wiki User
∙ 16y ago
It is difficult to control precisely, but in order to make polymers of a specific length using a free radical chain reaction, there are three steps: initiation, propagation and termination. To stop the chain reaction (termination) you need something to quench the free radicals so that the reaction cannot continue. This can be done by either adding a radical-quencher -- often a large molecule that can stabilize a free radical thus removing its high reactivity -- or the reaction can also be terminated because a limiting reactant has been consumed. While these methods will stop the reaction at a specific point in time, they don't guarantee that all of the polymer chains will be of equal length (there will be a distribution of lengths around some average value, although that distribution might be wide or narrow depending on numerous factors). Generally to obtain a polymer chain of one specific length, further purification and separation techniques are required.
Wiki User
∙ 16y ago
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