what is free radical mechanism. i wanted to know in detail.

Dear arush

Free Radical Mechanism

The relative stability of radicals can be correlated to the hydrogen bond dissociation energies of the parent compound.

High energy free radicals tend to abstract H from the backbone leading to grafting, branching reactions or decomposition for PP.

Lower energy radicals are more stable and selective.  They will preferably react on monomers containing double bonds and they are very good "monomer chasers" (acrylics, final stage in EPS, etc.)

Compound	Dissociation Energy (KJ/mol)	Type of radicals
	381	Low energy radicals: - high selectivity - good diffusion
	397
	410
	435	High energy radicals: - poor selectivity - good H abstractors - good diffusion
	439
	469
	469
	498
	377

The above shows the dissociation energies of various hydrogenated compounds.

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Prudhvi Teja

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A FREE RADICLE ATTACH IN AN ORGANIC COMPOUND BY ELIMINATING ANOTHER FREE RADICLE

THIS IS CALLED FREE RADICLE MECHANISM