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Polymers can be categorized into several types depending on their origin, structure, and degradability. One of the important modern classifications is biodegradable polymers, which can naturally decompose by the action of microorganisms, thereby reducing environmental pollution.
Nylon-2-Nylon-6 is a well-known example of a biodegradable polymer. It is produced through condensation polymerization of two different monomers:
Glycine (NH₂–CH₂–COOH) → an amino acid, which contributes the “Nylon-2” unit.
Amino caproic acid (NH₂–(CH₂)₅–COOH) → which contributes the “Nylon-6” unit.
When these two monomers undergo condensation, amide bonds (–CONH–) are formed, resulting in a polymer chain composed of alternating nylon-2 and nylon-6 units.
Why it is biodegradable:
Since its backbone contains peptide bonds (amide linkages) similar to those present in natural proteins, enzymes and microorganisms can attack these bonds, leading to its natural degradation. This property makes Nylon-2-Nylon-6 an eco-friendly material compared to many conventional synthetic polymers, which are non-degradable and cause environmental hazards.
Applications:
Used in surgical sutures, which dissolve naturally in the body without requiring removal.
Studied for drug delivery systems due to its compatibility and biodegradability.
Considered as a replacement for traditional non-degradable plastics in some applications.
Other Options Explained:
Synthetic polymer: Although it is man-made, the more accurate classification is biodegradable polymer.
Natural polymer: It is not naturally occurring; it is prepared in laboratories.
Branched polymer: Nylon-2-Nylon-6 has a linear chain structure, not a branched one.
Key Point:
Nylon-2-Nylon-6 is special because, unlike most nylons which are non-biodegradable, this variety is biodegradable, making it an important eco-friendly material in polymer chemistry.
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