Synthesis of Comb-Branched Polyethers Using Double Metal Cyanide Catalyst
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초록
내용
A series of comb-type polyethers consisting of polyethylene glycol monomethyl ether side chains with various repeating units (n = 3, 8, 28, 48, 94) have been synthesized by employing ring-opening polymerization (ROP) of ethylene glycol monomethyl ether (EGME) end-functionalized oxirane monomers. The functionalized monomers were prepared by reacting epichlorohydrin with different EGME derivatives in the presence of sodium hydroxide and tetrabutylammonium bromide. The comb-shape polymers were then synthesized by ROP of the functionalized monomers using double metal cyanide catalyst. The resultant polymers were characterized by nuclear magnetic resonance and gel permeation chromatography. The effect of the ethylene oxide repeating units in the side chains on the properties of the corresponding polymers was also investigated by thermogravimetric analysis and differential scanning calorimetry.