Question

What are biodegradable polymers and non biodegradable polymers class 12?

Answer 1

What are Biodegradable Polymer

These are those polymers which get decomposed under aerobic or anaerobic conditions, as a result of the action of microorganism/enzymes. The materials develop it like starch, cellulose, and polyesters. Aliphatic polyesters are the most commonly used polymers of this type.

Examples Of Biodegradable Polymers

Some examples are given as follows:-

Poly β-hydroxybutyrate – co-β-hydroxyvalerate (PHBV): It is derived by combining 3-hydroxy butanoic acid and 3-hydroxy pentanoic acid, in which monomers are cross-linked by an ester linkage. It decomposes to form carbon dioxide and water. It is brittle in nature, and it can be used in the production of drugs and manufacturing of bottles.

PHBV

Nylon 2–nylon 6: It is a polyamide copolymerisation of glycine (H2N−CH2−COOH) and aminocaproic acid (H2N−(CH2)5−COOH)..

Polyhydroxybutyrate (PHB): It is formed by the condensation of hydroxy butyric acid (3-hydroxy butanoic acid) molecules.

What are Non-Biodegradable Polymer:

They consist of long chains of carbon and hydrogen atoms. These molecules form an interatomic type of bonding and is adamant meaning it is tough for microbes to break the bonds and digest them. Thus a long period is required to decompose them.

Examples Of Non-Biodegradable Polymer

Some of the examples are:

Polyethylene: They are of three types:

Linear high-density polyethylene (HDPE)

Branched low-density polyethylene (LDPE)

Ultra-high molecular weight polyethylene(UHMWPE)

These have high strength and lubricity and are also used in orthopaedic implants and catheters.

Poly (tetrafluoro ethylene) (PTFE) (Teflon): They are chemically and biologically inert and have high lubricity. They are used in hollow fibres for enzyme immobilization, wiring in aerospace, etc.


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Answer 2

detergents with straight chain of hydrocarbon are preferred over branched chain as the latter are non biodegradable and consequently cause environmental pollution.

the biopolymers can be broken Into their components either by enzyme catalyzed reaction or by themselves during a certain period of tym and hence they are biodegradable.