A. Narumi, Y. Kimura, S. Kawaguchi
Feb 1, 2012
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0
Influential Citations
9
Citations
Journal
Colloid and Polymer Science
Abstract
The precipitation polymerizations of N-tert-butylacrylamide (NtBAM) in water are demonstrated; for example, the polymerization with potassium peroxodisulfate using a 15 g L−1 (118 mmol L−1) concentration of NtBAM in the feed ([NtBAM]0) was performed at 70 °C for 12 h, quantitatively producing poly(N-tert-butylacrylamide) particles with a number-average diameter (dn) of 203 nm and a coefficient of variation (Cv) of 4.7%. The particle sizes were controlled in the dns range between 75 and 494 nm by changing the monomer feeds or adding an electrolyte such as NaCl. The solid contents in the resulting aqueous latex solutions ranged from 0.1 to 1.5%, whereas it increased to 4.8% by applying a “shot-growth” technique. The polymerization in water under a somewhat unique condition is described, which was started from a heterogeneous system due to the presence of significantly large amounts of monomers ([NtBAM]0 = 50 g L−1). This also provided monodisperse latexes with the dn of 370 nm in 96% yield, in which the solid content reached 4.9%.