Question

In tree radical polymerization, transfer agents are used to control the molecular weig distribution, write the mechanism for the following cases; When solvent is used as transfer agent ii. When a monomer is used as transfer agent When other species like hydrogen is used as transfer agent b. Write the structures of the following Monomers, i Heyanethulmadini ili. When

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Answer 1

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0. In a free radical polymerization, transfer agents used to control the distribution, write the mecha for the following cases. ; When solvent is used as transfer agent. Soj: "Chain - growth polymerization to chain polymeriza tion." Many common polymers can be obtained by chain polymerization such as poly othylene (PĚ), polypropylene (PP), polyvinyl chloride (PVC) polymethyl methacrylate, polyacrylonitrile, polyviny! acetate. Some Carbon nanotube polymey 18 used for electronical devices. controlled living chain - growth conjugated polymerization will also enable the synthests of wel! - defined advanced structures, including block co-polymers. Their industrial applications extend to water purification, biomedical devices and Sensors. H₂ H₂ mac lac-X X- ch? vg " у у propagating radical Monomer H₂ x y Propagation kp ли Y R-S Transfer kete Transfer H₂ x C.C. H2 y C=CH2 Y & R-S v -CH у agent RS Reinitiation KRE Dead polymex New propagatin radical

is when a monomer is used as transfer agent Bol: chain transfer is a polymerization reaction by which the activity of a growing polymer chain is transferred to another molecule. P. & XR & Px +R' · chain transfer reactions reduce the average molecular Weight of the final polymer. Chain transfer can be either mtroduced deliberately into a polymerization. . chain transfer reactions Occwe in most forms of addition polymerisation including Hadical polymerization, feeing - opening polymerisation, co-ordination polymerisation iiiwhen other species like hydrogen is used as transfer agent. S01: • Transfer hydrogenation is the addition of hydrogen CHy; dihydrogen "in im-organic and organometallic chemistry to a molecule from a source other than gaseous H₂. • It is applied in industry and in organic Synthesis, in part because of the inconvenience and expense of using gaseous H2. . One large scale application of transfer hydrogenation is coal' liquefaction using "donor Solvents such as tetralin. Transfer hydrogenations can proceed with high enantios electivities when the Starting material is Prochiral: RRC =0 + Me CHOH – & RR C&H-OH & Me, e=0