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I CAN identify common materials and explain their uses.
I CAN analyze how life has changed due to advances in materials over the past century.
Bell Ringer
Bell Ringer
Mini Lesson
Mini Lesson
Polymers: Building Blocks of Modern Materials
Polymers: Building Blocks of Modern Materials
What Are Polymers?
Polymers are large molecules made up of repeating units called monomers.
They can be natural (like DNA, proteins, and rubber) or synthetic (like plastic and nylon).
Natural Polymers
Natural Polymers
Found in living organisms.
Examples:
Proteins → Made of amino acids (e.g., hair, muscles).
DNA → Stores genetic information.
Cellulose → Found in plant cell walls (e.g., wood, paper).
Natural Rubber → From rubber trees, used in tires and gloves.
Synthetic Polymers
Synthetic Polymers
Man-made for specific uses.
Examples:
Plastics → Polyethylene (grocery bags), PVC (pipes).
Nylon & Polyester → Used in clothing and ropes.
Teflon → Non-stick coating for cookware.
Polymerization: How Polymers Are Made
Polymerization: How Polymers Are Made
Polymerization is the process of linking monomers to form a polymer.
Two main types:
Addition Polymerization
Monomers add together without forming byproducts.
Example: Polyethylene (plastic bags).
Condensation Polymerization
Monomers join, releasing a small molecule like water.
Example: Nylon (used in textiles).
Properties of Polymers
Properties of Polymers
Lightweight – Used in packaging and clothing.
Durable – Lasts a long time, but can contribute to pollution.
Flexible or Rigid – Rubber is soft; PVC pipes are hard.
Resistant to Chemicals – Many plastics do not react with acids or bases.
Polymers and the Environment
Polymers and the Environment
✅ Benefits:
Used in medicine, clothing, packaging, and electronics.
Biodegradable options are being developed.
⚠️ Concerns:
Many plastics do not break down easily, leading to pollution.
Microplastics in water harm wildlife and ecosystems.
Recycling is important to reduce waste.
Lesson 1.3: All About Alloys
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