Abstract
The Rh-catalyzed polymerization of an acetylene-terminated poly(methyl methacrylate) (PMMA) macromonomer (M-PMMA) provided a helical poly(macromonomer), poly(M-PMMA) [Mw up to 136,000, weight-average degree of polymerization (DPw) = 80], consisting of a polyacetylene main chain and PMMA side chains. The macromonomer M-PMMA was synthesized by ATRP of MMA initiated by a functionalized initiator, 2-bromo-2-methylpropionic acid (S)-1-methylpropargyl ester (l), in the presence of CuBr/N,N,N′,N″,N″-pentamethyldiethylenetriamine (PMDETA) catalyst/ligand system in toluene at 70 °C. Poly(M-PMMA) was a light yellow solid soluble in common organic solvents such as THF, CHCl3, and toluene. Poly(M-PMMA) exhibited a strong CD signal at around 350–357 nm with molar ellipticities ([θ]) of +26300–+27500 deg cm2 dmol−1 in THF, CHCl3, toluene and DMF. This indicates that it possessed a predominantly one-handed helical conformation. Poly(M-PMMA) had stable helical conformation irrespective of solvents and temperature.
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Shiotsuki, M., Zhang, W. & Masuda, T. Synthesis and Properties of Helical Poly(macromonomer) Consisting of Polyacetylene Main Chain and Poly(methyl methacrylate) Side Chains. Polym J 39, 690–695 (2007). https://doi.org/10.1295/polymj.PJ2006260
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DOI: https://doi.org/10.1295/polymj.PJ2006260