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isotactic

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isotactic [¦ī·sə¦tak·tik]
(organic chemistry)
Designating crystalline polymers in which substituents in the asymmetric carbon atoms have the same (rather than random) configuration in relation to the main chain.


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PVC resins have what is called a linear isotactic structure, the chlorine is always on the same side of the carbon atom, causing crystallization within the PVC polymer.
The film consists essentially of metallocene catalyzed, isotactic ethylene-propylene copolymer having a random comonomer distribution.
 
 
 
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