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Biodegradable polymer; carbon reinforced polymers, chalcogenide glasses

Short answer

Biodegradable polymers like PHBV and PLA are decomposed by microorganisms. Carbon-fiber reinforced polymers are used in aircraft, racing cars, and wind turbines due to high strength-to-weight. Chalcogenide glasses find applications in infrared optics, thermal imaging, and phase-change memory.

What is biodegradable polymer? Write applications of carbon reinforced polymers and chalcogenide glasses in engineering.

Biodegradable polymer

Biodegradable polymers are polymers that can be broken down by the action of microorganisms (bacteria, fungi) and enzymes in the environment into CO₂, water and biomass. They contain links such as ester or amide groups that enzymes can attack.

Examples: PHBV (poly-β-hydroxybutyrate-co-β-hydroxyvalerate; from 3-hydroxybutanoic and 3-hydroxypentanoic acids), polylactic acid (PLA), polycaprolactone, starch- and cellulose-based plastics, and nylon-2-nylon-6 (glycine + aminocaproic acid). Uses: packaging, carry bags, disposable cutlery, surgical sutures, implants, and controlled drug delivery capsules.

Applications of carbon-reinforced polymers

Carbon-fibre reinforced polymers (CFRP, carbon fibres in epoxy) are extremely strong and light, stiff, fatigue and corrosion resistant:

  • Aircraft and spacecraft parts, helicopter blades, rocket motor casings.
  • Racing cars, bicycles, tennis rackets and golf shafts.
  • Strengthening of bridges and buildings, wind turbine blades.
  • Artificial limbs, and X-ray-transparent medical tables.

Applications of chalcogenide glasses

  • Infrared lenses and windows for thermal imaging and night vision.
  • IR optical fibres.
  • Phase-change memory and rewritable optical discs.
  • Photoreceptors of photocopiers; switching devices and sensors.

✓ Answer checked by Claude Opus 5.5 (high effort)

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