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Chemistry

How Chain Transfer Reactions Regulate Polymer Molecular Weight

Quick fact

A single chain transfer event can stop a growing polymer chain and start a new one, so even tiny amounts of a chain transfer agent can dramatically lower the average molecular weight.

Why this is interesting

Imagine growing a polymer chain—it can be suddenly cut short by a single molecular handshake. Why do some plastics turn out long and strong, while others remain short and brittle?