What is the function of UV stabilisers in polymers?

What is the function of UV stabilisers in polymers?

• A. UV stabilisers prevent photolysis, colour change and brittleness
• B. UV stabilisers increase thermal conductivity
• C. UV stabilisers reduce moisture uptake
• D. UV stabilisers promote biodegradation

Answer: (A)

UV stabilisers protect polymers from sunlight by stopping the damaging effects of UV radiation. UV light can trigger photochemical reactions that break polymer chains (photolysis) and create reactive species that cause oxidation, leading to colour fading and embrittlement. UV stabilisers absorb UV light or scavenge these reactive species, slowing down chain scission and oxidation, so the material keeps its strength and appearance longer. The other ideas don’t fit because UV stabilisers aren’t about transferring heat, reducing moisture uptake, or promoting biodegradation.

UV stabilisers protect polymers from sunlight by stopping the damaging effects of UV radiation. UV light can trigger photochemical reactions that break polymer chains (photolysis) and create reactive species that cause oxidation, leading to colour fading and embrittlement. UV stabilisers absorb UV light or scavenge these reactive species, slowing down chain scission and oxidation, so the material keeps its strength and appearance longer. The other ideas don’t fit because UV stabilisers aren’t about transferring heat, reducing moisture uptake, or promoting biodegradation.