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English Lexicon

Tacticity

/tækˈtɪs.ə.ti/
nounCEFR C2 (Proficient)Top #45000 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    The stereochemical arrangement of chiral centers in a polymer main chain, determining whether pendant groups lie on the same side, alternating sides, or randomly along the polymer backbone.

    "The tacticity of the polypropylene directly influences its melting point and mechanical strength."
  2. 2

    In broader chemical contexts, the relative spatial arrangement of substituent groups in a macromolecule.

    "Advanced catalysts are used to control the tacticity during the polymerization process."
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Linguistic Origin & Historical Etymology

Coined in the mid-20th century, derived from the Greek word 'taktikos' meaning 'pertaining to arrangement or order' (from 'tassein', to arrange). The chemical suffix '-ity' was added to denote a state or quality, specifically to describe the relative stereochemistry of adjacent chiral centers in a macromolecular main chain.

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