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Thodoris C. Vasilakopoulos and Nikos Hadjichristidis Influence of (1,3-phenylene)bis(3-methyl-1-phenyl pentylidene)dilithium initiator concentration on the modality of polybutadiene Journal of Polymer Science Part A: Polymer Chemistry 51

Version of Record online: 26 NOV 2012 | DOI: 10.1002/pola.26435

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The concentration of the (1,3-phenylene)bis(3-methyl-1-phenyl pentylidene)dilithium initiator (DLI) in the polymerization of butadiene (Bd) in benzene, in the presence of s-BuOLi at room temperature, is very important for the modality of the resulting polybutadiene (PBd). Keeping the s-BuOLi/C-Li ratio close to unity, at relatively high DLI concentrations (C > 7×10−4 M) monomodal high 1,4-PBds with polydispersity index less than 1.07 were obtained, whereas bimodal ones were obtained at lower concentrations (C<6×10−4 M).This is due to the inevitable presence of protic impurities which are more pronounced in the case of lower DLI concentrations.

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