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What is crosslinking in polymers ?...

What is crosslinking in polymers ? 

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Based on the structures, polymers are 3 types : Unbranched, branched and network polymers. Polymers containing strong covalent bonds between various linear chains are called network polymers. Joining various chains by covalent bonds is called cross linking and this leads to network structure like in bakelite and malamine polymers.
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AAKASH SERIES-POLYMERS-PROBLEMS
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  19. How is PTFE familiar commercially?

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