Swelling behavior of poly- N-isopropylacrylamide microgel particles in alcoholic solutions |
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Authors: | H M Crowther B Vincent |
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Institution: | (1) School of Chemistry University of Bristol Cantock’s Close Bristol BS8 1TS, UK, GB |
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Abstract: | It has been shown that the swelling of poly-N-isopropyl-acrylamide (poly-NIPAM) microgel particles can be controlled by the addition of alcohols, in addition to the previously
observed effect of temperature. The degree of swelling is also controlled by the amount of cross-linker within the microgel
particles. At 25 °C, poly-NIPAM microgel particles collapse upon the addition of MeOH, EtOH and 2-PrOH to a minimum size and then, reswell again
as the alcohol-rich region is approached. This trend was also observed for poly-NIPAM microgel particles dispersed in 2-PrOH/water
mixtures upon heating to 50 °C. The particles, dispersed in either water or alcohol/water mixtures were found to be stable to flocculation between 25 °C and 50 °C.
Received: 27 February 1997 Accepted: 5 August 1997 |
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Keywords: | Microgel poly-NIPAM deswelling cononsolvency |
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