Polymers J and K are both thermosoftening polymers. Polymer L is a thermosetting polymer.
Why would polymer L be better than polymers J and K for firefighter uniforms?

The key difference between thermosoftening and thermosetting polymers lies in their structure and response to heat. - **Thermosoftening polymers** have long chains with weak intermolecular forces between them. When heated, these forces are easily overcome, allowing the chains to slide over each other, so the polymer softens and melts. This would be dangerous for a firefighter. - **Thermosetting polymers** have strong covalent bonds (cross-links) between their polymer chains. These cross-links hold the chains firmly in place. When heated, the polymer does not melt; it remains solid and will eventually char at very high temperatures. This property makes it much safer for applications involving high heat, like firefighter uniforms.