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Viscosity enhancement resulting from chain

Polymeric substances may show enhanced viscosity in H bonding solvents. Edelson and Fuoss (576) show that the greatly increased effect of water as a solvent (even compared to methanol) results from its bifunctional H bonding character which helps hold polyacrylate chains together. [Pg.63]

The chain-transfer reaction is essentially unchanged in going from bulk polymerization to toluene solution.30 In the low-viscosity medium, supercritical C02, chain transfer was found to be significantly enhanced by an order of magnitude (108 L mol 1 s ) compared with toluene or bulk MMA as a medium. Again, the results are consistent with a diffusion-controlled rate-determining step.30 However, another report indicates no enhancement of chain transfer in supercritical C02.126 This discrepancy may be the result of the necessity of using different catalysts in the two media. [Pg.523]

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Viscosity enhancement

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