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  4. Three dimensional molecules with cross links are formed in the case of a

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Q. Three dimensional molecules with cross links are formed in the case of a _______

KCETKCET 2005Polymers

Solution:

Thermosetting plastic consists of chain of the molecules which are cross-linked, with each other when heated. When thermosetting plastics cross-link, the molecules create a permanant, network which is a $3-$ D structure and can be considered one giant molecule. Once cured, thermosetting plastic cn not be remelted, in the same way that cured concrete cannot be reset.