Why does crosslinking increase the environmental stress-crack resistance of polymers?
What will be an ideal response?
Environmental stress-cracking is seen in polymers that have high internal orientation, such as extruded polyethylene tubing which has had a high drawdown. The polymer molecules are aligned in such cases and are stressed. When the environmental effects act on these polymers, cracking occurs. By crosslinking the polymers, the chains are held together and cracking is prevented.
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