STEREOCHEMISTRY OF POLYMERIZATION

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STEREOCHEMISTRY OF POLYMERIZATION

• The polymer properties are strongly affected by
  the molecular microstructure and not only the R.
  U. from which it is formed, but also how the
  atoms are arranged in the R.U.
• This differences are areas from the possibility
  of different modes of propagation (head to tail
  and head to head).

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TACTICITY

• For polymer with general structure of the R.U.
  CH2-CXY then are three configuration.

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ISOTACTIC
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SYNDIOTACTIC
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ATACTIC

• This is irregular configuration.

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Examples

• 1. Polypropylene X H and Y CH3
• The commercial material is Isotactic due to its
  regular structures (65 crystalline).
• But atactic polypropylene is unable to
  crystalline and have poor mechanical properties
  because it is soft and waxy like.

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Thank You

• See You Next Lecture