Abstract
A neutral nickel σ-acetylide complex [Ni(CCPh) 2(PBu 3) 2] (NBP) is used for possible atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in conjunction with an organic halide as an initiator [R–X: CCl 4, CH 3Cl, BrCCl 3, C 2H 5Br, and C 5H 9Br] in toluene at 80 °C. Among these initiating systems, BrCCl 3/NBP gave the best controlled radical polymerization of MMA and produced polymer with relatively narrow molecular weight distribution ( M w/ M n≈1.3). The ATRP of MMA is preliminarily identified by the following facts: (1) the present MMA polymerization initiated by BrCCl 3/NBP is completely hindered by the addition of TEMPO; (2) the conversion shows a typical linear variation with time in semilogarithmic coordinates; (3) the measured number-average molecular weights of polymer show a linear increase with conversion and agree closely with the theoretical values; (4) the resulting polymer chain contains a dormant carbon–halogen terminal.
Published Version
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