Kinetic Studies upon the Influence of Cyclodextrin on the Polymerization of Methacrylamides in Homogenous Aqueous Solution

Abstract

Abstract Summary: N ‐methacryloyl‐1‐aminopropane ( 1 ), N ‐methacryloyl‐1‐aminobutane ( 2 ), N ‐methacryloyl‐1‐aminopentane ( 3 ), and N ‐methacryloyl‐1‐aminohexane ( 4 ) are synthesized and treated with an aqueous solution of randomly methylated β ‐cyclodextrin (Me‐ β ‐CD) to form the water‐soluble host‐guest complexes 1a – 4a . In case of the aqueous polymerization of the free monomers 1 – 4 the initial polymerization rate increases with increasing water solubility. The opposite effect is observed in the case of the polymerizations of the Me‐ β ‐CD‐complexed methacrylamide monomers 1a – 4a . The polymerization rates are increased with increasing alkyl chain length of the complexed monomers 1a – 4a and decreasing water solubility of the free monomers 1 – 4 . Initial polymerization rate v 0 of CD‐complexed monomers 1a – 4a (○) vs. water solubilities of monomers 1 – 4 (▪). magnified image Initial polymerization rate v 0 of CD‐complexed monomers 1a – 4a (○) vs. water solubilities of monomers 1 – 4 (▪).