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Tacticity
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===Tetrads, pentads, etc.=== The definition of tetrads and pentads introduce further sophistication and precision to defining tacticity, especially when information on long-range ordering is desirable.{{fact|date = December 2024}} Tacticity measurements obtained by [[carbon-13 NMR]] are typically expressed in terms of the relative abundance of various pentads within the polymer molecule, e.g. ''mmmm'', ''mrrm''.{{says who|date = December 2024}}
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