Synthetic
Comprehensive notes, formulas, and practice questions for Synthetic.
Synthetic
Synthetic Fibres
What you'll learn
- Synthetic fibres are made by humans from chemicals — not grown on plants or animals.
- Common examples — polyester, nylon, acrylic, rayon (regenerated cellulose intro).
- Advantages (strong, cheap, wrinkle-resistant) and disadvantages (non-biodegradable, heat sensitivity).
- How to distinguish natural vs synthetic using simple observations and care labels.
Key concepts
Level 1 — What "synthetic" means
Verbal: Synthetic fibres are man-made through industrial processes using petrochemicals or processed plant pulp.
| Fibre | Nickname / trait | Typical use |
|---|---|---|
| Polyester | Terylene | Bottles, dress material, blends |
| Nylon | Strong, elastic | Socks, ropes, parachutes |
| Acrylic | Wool-like | Sweaters (Orlon) |
| Rayon | Art silk | Flowing garments |
Visual: Factory chemicals → polymer threads → stretched into long fibres → woven/knitted fabric.
Level 2 — Properties, blends, and environment
Advantages: Strong, lightweight, dry quickly, resist moths (unlike wool).
Disadvantages: Many do not decompose easily → plastic pollution if discarded carelessly; melt on high heat.
Blends: Polycot = polyester + cotton — combines durability with comfort.
Safety: Synthetic clothes can melt if too close to flame — cotton preferred for kitchen/work near fire.
Recycling (intro): PET bottles recycled into polyester fabric — reduces waste.
Worked example
Compare cotton shirt vs polyester sport T-shirt for a hot cricket match.
Step 1 — Cotton: absorbs sweat, breathable → cooler feel
Step 2 — Polyester: wicks moisture in modern designs but less breathable in cheap fabric
Step 3 — Polyester: dries faster if rain; stronger
Step 4 — Choice depends on comfort vs durability; many sportswear uses blends
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| Synthetic = bad always | One-sided view | Useful when properties needed (rope strength) |
| Rayon is fully synthetic like nylon | Partially from cellulose | Rayon from natural pulp, chemically processed |
| All shiny cloth is silk | Appearance trick | Could be polyester or rayon |
| Burning plastic smell ignored | No burn test safety | Teacher demo: synthetic often beads on burning |
Quick check
- What is the main difference between natural and synthetic fibres?
- Name two synthetic fibres and one use of each.
- Why are synthetic fibres a concern for the environment?
- What is a polycot blend?
Open the Practice tab for graded questions on Synthetic Fibres.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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