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Plastic Production - Coggle Diagram
Plastic Production
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Types of Plastics
Conventional Plastics:
1.Made from fossil fuels (petroleum, coal, natural gas).
2.Advantages: Durable, cheap, versatile.
3.Disadvantages: Environmental and health impact.
Bioplastics
1.Made from renewable resources (plant fats, oils, starch, food waste).
2.Advantages: Sustainable.
3.Disadvantages: Low stability, prone to biological degradation.
Biodegradable Plastics:
1.Decomposed by microorganisms.
2.Break down into water, CO₂, biomass, and methane (anaerobic conditions).
- Examples
-Bioplastics: Poly(lactic acid) (PLA), polyhydroxybutyrate (PHB).
-Petroleum-based: Polycaprolactone (PCL), poly(butylene adipate terephthalate) (PBAT).
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Fabrication Methods
Thermoplastics
1.Formed above their glass transition (Tg) or melting point (Tm).
2.Maintains shape upon cooling under applied pressure.
3.Advantages: Recyclable, can be re-melted and reshaped.
Thermosetting Polymers:
Fabrication in two stages:
1.Prepolymer preparation (liquid form).
2.Curing under heat or with catalysts (forms a crosslinked structure).