Tacticity

• It is the orderliness of the succession of

configurational base units in the main chain of

a polymer molecule.

➢Isotactic

➢Syndiotactic

➢Actactic

Isotactic

• An isotactic polymer is a regular polymer consistng

only of one species of configurational base unit, i.e

only d or l form.

Syndiotactic

• A syndiostatic polymer consists of an alternatig

sequence of the different configurational base

unts.

Actactic

• An Atatic polymer has equal numbers of

randomly distributed configurational base

units.

➢Carbon -13 (

13C) nuclear magnetic resonance

(NMR) is the most useful method of assessing

tacticity.

➢By 13C NMR it is possible to assess the

different sequential distributions of adjacent

configurational units that are called dyads,

triads, tetrads and pentads.