= Statistical copolymer
A <statistical copolymer> contains more than one kind of monomer unit, with their sequence distribution following a specified statistical rule. A random copolymer is a special case when an appropriate independence model describes the sequence.
Monomer reactivity can produce correlations, composition drift, or blocks longer than a simple random model predicts. Describing only the average monomer fractions therefore does not determine the complete sequence structure or material properties.
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