Question

38. Gutta percha is the ............. polymer.
(A) Isotactic
(B) Atactic
(C) Syndiotactic
(D) None of these
39. Polyprophylene is the ....... polymer
(A) Atactic
(B) Isotactic​

Answer 1

Answer:

isotactic

Explanation:

thermoplastic

Answer 2

Gutta-percha is the (C) Syndiotactic polymer.

Polypropylene is the (B) Isotactic​ polymer.

Syndiotactic polymer:

• A syndiotactic polymer is one in which the pendant groups are arranged along the hydrocarbon backbone chain in a predictable, alternating manner.
• Syndiotactic polymers include, for instance, gutta-percha, a sort of permanent dental filling that is utilized in root canals due to its biological inertness.
• Syndiotactic polystyrene has a melting temperature of 161 °C and is crystallized.
• It is produced through metallocene-catalyzed polymerization.

Isotactic​ polymer:

• Isotactic macromolecules make up isotactic polymers (IUPAC definition).
• All of the substituents in isotactic macromolecules are situated on the same side of the macromolecular backbone.
• Meso diads make up every single component of an isotactic macromolecule.
• An isotactic polymer, polypropylene is produced using Ziegler-Natta catalysis.

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