Polymers and Materials IGCSE Chemistry: Complete Guide

🧪 Understanding Polymers in IGCSE Chemistry

Polymers are large molecules made from repeating units. This guide covers polymerization, properties, and applications.

🧠 Memory Tips

Polymer Types: “Addition Condensation”

• Addition: Alkenes join together
• Condensation: Small molecules eliminated

Common Polymers: “Polyethene Polystyrene PVC Nylon”

• Polyethene: Plastic bags
• Polystyrene: Packaging
• PVC: Pipes, cables
• Nylon: Clothing, ropes

📚 Key Concepts

What are Polymers?

• Definition: Large molecules from repeating units
• Monomers: Small molecules that join
• Polymerization: Process of joining monomers
• Applications: Plastics, fibers, rubbers

Addition Polymerization

• Monomers: Contain C=C double bonds
• Process: Double bonds break and join
• Examples: Polyethene, polystyrene, PVC
• No by-products: Only polymer formed

Condensation Polymerization

• Monomers: Have two functional groups
• Process: Small molecules eliminated
• Examples: Nylon, polyester, proteins
• By-products: Water or HCl formed

Polymer Properties

• Thermoplastics: Soften when heated
• Thermosets: Don’t soften when heated
• Strength: Depends on structure
• Flexibility: Chain arrangement affects

🎯 Exam Focus

Common Questions:

1. Draw polymer structures (4 marks)
2. Compare addition and condensation (5 marks)
3. Explain polymer properties (4 marks)
4. Describe environmental issues (3 marks)

Key Examples:

• Ethene → Polyethene
• Styrene → Polystyrene
• Diamine + Dicarboxylic acid → Nylon

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