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Light-scattering study of the coil-to-globule transition of linear poly(N-isopropylacrylamide) ionomers in water by Xingping Qiu; Mei Li; Chi Man Simon Kwan; Chi Wu is a Materials Science article available to read on EtoBox.

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The coil-to-globule transition of two poly( N-isopropylacrylamide) (PNI-PAM) ionomers with different ionic contents (0.8 and 4.5 mol %), but similar weight average molar masses, in deionized water was investigated by a combination of static and dynamic light scattering. In spite of the large difference in their ionic contents, both the ionomers have a nearly same lower critical solution temperature (LCST, Ç 32.5ЊC). At temperatures higher than the LCST, the ionomer chains undergo a simultaneous intrachain coil-to-globule transition and interchain aggregation to form nanoparticles thermodynamically stable in water. The average size of the nanoparticles decreases respectively as the ionic content increases and the ionomer concentration decreases. The interchain aggregation can be completely suppressed in an extremely dilute ionomer solution ( õ Ç 5 1 10 06 g/mL), so that the intrachain coil-to-globule transition leads to the collapse of the ionomer chains into individual single-chain nanoparticles. Our results clearly indicate that there is a hysteresis in the colling process (the globule-to-coil transition).

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Author

Xingping Qiu; Mei Li; Chi Man Simon Kwan; Chi Wu

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-6266)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)