Aitipamula, S., Hadia, N. J., Vasantha, V. A., Parthiban, A. (2024). An Exceptionally Salt Tolerant Copoly(Maleimide Sulfobetaine) – Structural Requirements for Ultra‐Salt Tolerance. Macromolecular Rapid Communications. Portico. https://doi.org/10.1002/marc.202400499
Abstract:
Zwitterionic polymers are an important class of polymers with far‐ranging applications. In the widely studied poly(meth)acrylate and poly(meth) acrylamide‐based zwitterions, properties can be tuned by changing the nature of substituents attached to ammonium ions. However, these changes influenced salt tolerance of zwitterionic polymers only to a limited extent. Upon adding salt these polymers expanded in solution initially. Further increase in salt concentration caused the polymer chains to shrink similar to the common water soluble, uncharged polymers thereby deteriorating the viscosity of aqueous solutions. In contrast to the conventional poly(meth)acrylate and poly(meth)acrylamide‐based zwitterions, zwitterionic copolymaleimides showed substituent dependent salt‐tolerant nature. In the absence of any substituent on the polymer backbone such as zwitterionic poly(ethylene‐alt‐maleimide) (ZI‐PEMA) the viscosity of salt solutions increased both with the increasing salt concentration as well as the concentration of polymer. This is likely due to the continuous expansion of polymer coil in salt solutions with increasing salt concentration caused primarily by the rigidity of the polymer backbone. ZI‐PEMA also enhanced the saturation limit of mono‐ and divalent salts like sodium chloride and hydrated calcium bromide in water. This property is useful for various applications like fish curing, for making high‐density fluids, refrigeration, etc. across various industrial sectors.
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Publisher Copyright
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Environmentally Friendly Specialty Products Programme Grant
Grant Reference no. : 1528000045
Description:
This is the peer reviewed version of the following article: Aitipamula, S., Hadia, N. J., Vasantha, V. A., & Parthiban, A. (2024). An Exceptionally Salt Tolerant Copoly(Maleimide Sulfobetaine) – Structural Requirements for Ultra‐Salt Tolerance. Macromolecular Rapid Communications. Portico. https://doi.org/10.1002/marc.202400499, which has been published in final form at https://doi.org/10.1002/marc.202400499. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.