Chemistry · JEE Advanced only

Polymers: Types, Natural Rubber, Cellulose, Nylon, Teflon, Bakelite, PVC (JEE Advanced)

Not in the JEE Main syllabus, but it is in JEE Advanced. Study time: about 4-5 hours. Spend 1.5 hours learning structures and monomers of all named polymers. Spend 1 hour on polymerization types and mechanisms. Spend 1 hour on properties and applications. Use remaining time for practice problems on classification and numerical calculations..

Last updated: 26 October 2026

Direct answer

Polymers are large molecules made by joining many small repeating units called monomers.

Polymers are large molecules made by joining many small repeating units called monomers. This topic covers how polymers form (addition vs condensation), their classification (homo and copolymers), and specific important polymers like natural rubber, cellulose, nylon, Teflon, Bakelite, and PVC along with their structures and uses.

Official syllabus

What the JEE Advanced syllabus says

“Types of polymerization (addition, condensation); Homo and copolymers; Natural rubber; Cellulose; Nylon; Teflon; Bakelite; PVC; Bio-degradable polymers; Applications of polymers”

Source: JEE Advanced 2026 Information Bulletin, Annexure-I. Closest JEE Main topic: polymerization.

JEE Main covers basic polymerization concepts, but Advanced goes deeper into specific polymer structures, their synthesis mechanisms, and distinguishing between different types. You need to know the exact monomers, linkages, and properties of each named polymer.

Key ideas

What you must understand

Addition polymerization: monomers add without losing atoms (e.g., ethene → polyethene, Teflon from CF₂=CF₂). Condensation polymerization: monomers join by losing small molecules like H₂O (e.g., nylon, Bakelite).
Homopolymers have one type of monomer (PVC, Teflon). Copolymers have two or more different monomers (Buna-S from butadiene + styrene, nylon-66 from hexamethylenediamine + adipic acid).
Natural rubber is cis-1,4-polyisoprene. Gutta-percha is trans-1,4-polyisoprene. The cis form is elastic, trans form is rigid. Vulcanization with sulfur creates cross-links and improves rubber properties.
Cellulose is a polysaccharide with β-1,4-glycosidic linkages between glucose units. It cannot be digested by humans but forms the basis for rayon and cellophane.
Nylon-66: made from hexamethylenediamine (6 carbons) and adipic acid (6 carbons) via amide linkages. Nylon-6: made from caprolactam (ring-opening polymerization).
Bakelite is a thermosetting polymer from phenol + formaldehyde. PVC is addition polymer of vinyl chloride (CH₂=CHCl). Teflon (PTFE) is chemically inert due to strong C-F bonds.

Formulas

Formulas and key facts

Natural rubber: (C₅H₈)ₙ, monomer is isoprene CH₂=C(CH₃)−CH=CH₂
Nylon-66: [−NH(CH₂)₆NH−CO(CH₂)₄CO−]ₙ from H₂N(CH₂)₆NH₂ + HOOC(CH₂)₄COOH
Teflon (PTFE): (−CF₂−CF₂−)ₙ from tetrafluoroethene CF₂=CF₂
PVC: (−CH₂−CHCl−)ₙ from vinyl chloride CH₂=CHCl
Bakelite: phenol + HCHO → cross-linked network (thermosetting)
Cellulose: (C₆H₁₀O₅)ₙ with β-1,4-glycosidic bonds
Buna-S (SBR): copolymer of 1,3-butadiene + styrene
Degree of polymerization (n) = Molecular mass of polymer ÷ Molecular mass of repeating unit

Avoid

Common mistakes

Confusing cis and trans forms of polyisoprene: natural rubber is cis (elastic), gutta-percha is trans (hard). Remember 'natural is cis'.
Mixing up nylon-66 and nylon-6: nylon-66 needs TWO monomers (diamine + diacid), nylon-6 needs ONE monomer (caprolactam ring opening).
Forgetting that Bakelite is thermosetting (cannot be remolded) while PVC and Teflon are thermoplastics (can be remolded on heating).
Wrong classification: addition polymers keep all atoms from monomers, condensation polymers lose small molecules. Nylon loses H₂O, so it is condensation even though it looks like 'adding' two monomers.

Worked example

A JEE Advanced-level example

Question. A sample of polyvinyl chloride (PVC) has a molecular mass of 62,500 g/mol. Calculate the degree of polymerization. Also, identify whether PVC is formed by addition or condensation polymerization and state if it is a homopolymer or copolymer.

Show solution

Step 1: Write the repeating unit of PVC. Monomer is vinyl chloride CH₂=CHCl. Repeating unit is −CH₂−CHCl−.
Step 2: Calculate molecular mass of repeating unit. M = 2(12) + 3(1) + 35.5 = 24 + 3 + 35.5 = 62.5 g/mol.
Step 3: Calculate degree of polymerization. n = 62,500 ÷ 62.5 = 1000.
Step 4: Type of polymerization: Addition polymerization (vinyl chloride molecules add across the double bond without losing any atoms).
Step 5: Classification: Homopolymer (only one type of monomer, vinyl chloride, is used).

Answer: Degree of polymerization = 1000. PVC is formed by addition polymerization and is a homopolymer.

Solved twice independently; both solutions agree.

FAQs

Frequently asked questions

Is Polymers: Types, Natural Rubber, Cellulose, Nylon, Teflon, Bakelite, PVC in the JEE Main syllabus?

No. It is in the JEE Advanced 2026 syllabus only. The closest JEE Main topic is polymerization.

How long does Polymers: Types, Natural Rubber, Cellulose, Nylon, Teflon, Bakelite, PVC take to prepare for JEE Advanced?

About 4-5 hours. Spend 1.5 hours learning structures and monomers of all named polymers. Spend 1 hour on polymerization types and mechanisms. Spend 1 hour on properties and applications. Use remaining time for practice problems on classification and numerical calculations., if you already know the related JEE Main topic.