Abstract
Vinyl ethers having oxyethylene units [CH2=CHO-(CH2CH2O)-nC2H5, n=1–4] were cleanly polymerized by the HI/I2 initiator in a nonpolar solvent (toluene) at low temperatures (−15 and −40°C) to yield living-like polymers with a very narrow molecular weight distribution (Mw/Mn ≤1.2); the oxyethylene units in the monomers hardly disturbed the polymerization. The number-average molecular weight of the polymers increased proportionally to monomer conversion and the monomer-to-HI feed ratio. The polymerization rates of the (poly)ether-containing vinyl ethers were much greater than those of alkyl vinyl ethers under similar conditions, and it is presumed that the pendant ether oxygens intramolecularly activate the growing end. The polymers were soluble in methanol (with n≥1) and in water (with n≥2), depending on the number of oxyethylene units in the pendant.
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