Questions about polymers and their properties

[xthanhx]

Homework Statement

Hello everyone, I have a couple of question regarding polymers that I some trouble understanding and hoping you guys would point me into the right direction.
For ''Thermosetting'' polymers I know that they become permanently hard with covalent bonds which they chain together to resist vibration at high temperature. So is it impossible to melt this polymer? Is it true that they do not have a melting point even at extremely high temperature?
Another problem I have regard polymer is about the Elastomer, why must it be cross-linked? Does it have to do with their elastic properties? I know that by cross-linking, the polymers do become stronger so cross-linking elastomers purely making them stronger? Have a nice day everyone.

 

[Nino MMP]

Homework Equations N/AThe Attempt at a Solution For Thermosetting polymers, it is impossible to melt the polymer as it does not have a melting point. The covalent bonds formed between monomers are so strong that it is difficult to break them down. Instead, thermoplastic polymers can be melted and moldable. Elastomer is a type of rubber-like polymer which is cross-linked, that is why it can be elastically stretched and return to its original shape. The cross-linking allows the chains to resist breaking when being stretched, giving it its elastic properties. By cross-linking the elastomer, it does become stronger and more resistant to wear and tear as the cross-links form bridges between chains.