Which one can achieve higher crystallinity: isotactic polypropylene or atactic polypropylene? Explain your reasoning .

Which one can achieve higher crystallinity: isotactic polypropylene or atactic polypropylene? Explain your reasoning

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Expert Solution

ANSWER: ISOTACTIC POLYPROPYLENE

EXPLANATION:

TACTICITY- Study of the stereochemistry of the adjacent chiral centres within a macromolecule. It signifies the physical properties of that molecule.

For a polymer to form a perfect crystalline substance, it should possess a characteristic named regularity.
Polymers melt when it becomes possible for their chains to slide past each other.
The better packed together the chains are, the more difficult it is for them to slide.
The more regular the structure of the polymer, the better the chains are able to pack.
Isotactic polymers have all of their side groups on the same side of the chain. This allows their chains to pack together very closely into perfect crystals.
Atactic polymers have randomly distributed side groups. The absence of periodicity makes it impossible to pack the chains into high-quality crystals.

HENCE ISOTACTIC POLYPROPYLENE WILL ACHIEVE HIGHER CRYSTALLINITY

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Which one can achieve higher crystallinity: isotactic polypropylene or atactic polypropylene? Explain your reasoning .

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