Download Anionic Polymerization by L. J. Ferry PDF

By L. J. Ferry

This exhaustive reference textual content systematically introduces the elemental theories and experimental equipment of anionic polymerization in addition to the synthesis, research, and features of anionically polymerized items.

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Also, initial rates of initiation in aliphatic solvents were found to be several orders of magnitude less than those observed, under equivalent conditions when the aliphatic solvent was replaced with benzene. Pronounced induction periods are also shown by these systems. It, thus, would appear that in aliphatic solvents the initiation process involves reaction o f the monomer with aggregated organolithium species. A further complicating feature is the presence of cross-associated structures involving the initiating organolithium and the newly formed benzylic- or allylic-lithium species.

Fetters can complex with the tertiary amine groups via the phenol groups. Although not considered by Worsfold, the above compound can also self-associate by interaction of the phenol groups either with themselves or with the carbonyl oxygens. Worsfold found that the degree of association as measured from viscosity was less than that indicated by the light scattering and spectroscopic results. It was therefore concluded that the association ~ dissociation rates were comparable to the chain entanglement lifetime.

11) dictates that at least 45 percent of the active centers exist in the self-associated state. N. Young, R. P. Quirk and L. J. 9994 correlation coefficient (Fig. 9). 3 x 10 -4 M). Acting on the assumption that the aggregated chain ends were incapable of growth, Smets and co-workers ~64) used a curve fitting procedure to deduce that the dissociation equilibrium constant was 10 -3 molar, This value dictates that the percentage of unassociated active centers would vary from about 15 to 61 over the concentration range studied.

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