Coil-to-globule transitions of interfacial copolymers in better than theta-solvents |
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Authors: | K. Turner P. W. Zhu D. H. Napper |
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Affiliation: | (1) School of Chemistry, The University of Sydney, 2006 Sydney, NSW, Australia |
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Abstract: | Experimental studies of the coil-to-globule transitions exhibited in better than -solvents by interfacial copolymers ofN-isopropylacrylamide and acrylamide imply that a lower bound for the value of n in then-clusters of poly(N-isopropylacrylamide) (PNIPAM) is 3. The corresponding upper bound is therefore likely to be 5 or 6. Statistical copolymers of PNIPAM containing upwards of 0.75 mole fraction of acrylamide (whose homopolymer does not itself displayn-clustering) exhibited this transition, which disappeared at higher mole fractions of acrylamide. Interfacial homopolymers ofN-ethylacrylamide and its statistical copolymers withN-isopropylacrylamide exhibitedn-clustering at all compositions. |
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Keywords: | Interfacial copolymers coil-to-globule transitions hydrophobically modified poly(acrylamides) poly(N-isopropylacrylamide) n-clusters |
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