Polymers
Kerala Board · Class 12 · Chemistry
Quick revision notes for Polymers — Kerala Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Fundamentals of Polymers
- Polymers are high molecular mass compounds formed by linking monomers through chemical bonds
- Monomers are small molecules capable of linking to form polymers (e.g., ethene → polyethene)
- Degree of polymerization (n) indicates the number of monomer units in a polymer chain
Types of Polymerization
- Addition polymerization: monomers add without loss of atoms (chain growth mechanism)
- Condensation polymerization: monomers combine with elimination of small molecules like H2O
- Addition polymerization requires unsaturated monomers (alkenes, dienes)
Classification of Polymers
- Based on source: Natural (starch, cellulose, proteins) vs Synthetic (polyethene, nylon)
- Based on structure: Linear (high density), Branched (low density), Cross-linked (network)
- Based on molecular forces: Elastomers, Fibers, Thermoplastics, Thermosetting
Important Synthetic Polymers
- Polyethene: -(CH2-CH2)n-, used in packaging, pipes, insulators
- Polypropylene: -(CH2-CH(CH3))n-, harder than polyethene, used in ropes, carpets
- PVC: -(CH2-CHCl)n-, resistant to chemicals, used in pipes, raincoats
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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