Which consequence results when alkane polymers degrade under ultraviolet exposure?

💡 Explanation

Ultraviolet exposure causes homolytic cleavage of C-C bonds through chain scission; free radicals initiate further depolymerization because this destabilizes the main chain, resulting in random breaking rather than increased crosslinking at the same temperature.

• Which outcome results when thermal expansion weakens a solder joint bonding a component to a PCB, causing grain boundary separation?
• Which risk increases when using gravitational time dilation for satellite navigation?
• Which outcome occurs when a reversible Carnot cycle operates isothermally with zero temperature difference?
• Which consequence arises when exceeding the maximum allowed concentration of dissolved oxygen molecules within a polymer electrolyte membrane fuel cell?
• Which outcome develops when excessive high-frequency voltage is applied across a ceramic capacitor?
• Which phenomenon limits ionic conductivity in solid-state electrolytes as temperature decreases?