Encyclopedic Dictionary of Polymers

2011 Edition
| Editors: Jan W. Gooch


  • Jan W. Gooch
Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-6247-8_9731

\ra-di-kәl\ n [ME, fr. LL radicalis, fr. L radic-, radix root] (1641) A group of atoms, normally part of a molecule that may replace a single atom (frequently H in organic compounds) and remain unchanged during reactions of the compound. Some examples are the ethyl radical, −C2H−, the acetate radical, CH3COO−, and the phenyl radical, −C6H5. Many chemical-reaction mechanisms postulate the transitory existence of unattached (“free”) radicals as intermediates, which, because of their charge, are extremely reactive.  Free Radicals play important roles in addition polymerizations. A few free radicals are known that are sufficiently stable to permit their identification ad quantitative determination as chemical entities (Morrison RT, Boyd RN (1992) Organic chemistry, 6th edn. Prentice-Hall, Englewood Cliffs, NJ; Smith MB, March J (2001) Advanced organic chemistry, 5th edn. Wiley, New York; Odian GC (2004) Principles of polymerization. Wiley, New York).

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© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Jan W. Gooch
    • 1
  1. 1.AtlantaUSA