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Less-Ordered Hydration Shell around Poly(N,N-diethylacrylamide) Is Insensitive to the Clouding Transition.

Di Zhou1, Ling-Shu Wan1, Zhi-Kang Xu1

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.

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Heating poly(N,N-diethylacrylamide) (PDEAM) causes coil-globule transitions without altering its hydration shell structure. This differs from poly(N-isopropylacrylamide) (PNIPAM), which shows a more ordered hydration shell.

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Spectroscopy

Background:

  • Poly(N,N-diethylacrylamide) (PDEAM) and poly(N-isopropylacrylamide) (PNIPAM) are polymers exhibiting clouding transitions.
  • Understanding the hydration shell's role in polymer transitions is crucial for material design.

Purpose of the Study:

  • To investigate the hydration shell structure of PDEAM and PNIPAM during thermal transitions.
  • To compare the hydration shell behavior of PDEAM and PNIPAM relative to their clouding points.

Main Methods:

  • Raman spectroscopy combined with multivariate curve resolution (Raman-MCR) was employed.
  • The study focused on analyzing changes in the hydration shell around PDEAM and PNIPAM chains upon heating.

Main Results:

  • PDEAM exhibits a less-ordered and smaller hydration shell compared to PNIPAM.
  • The hydration shell structure of PDEAM remains largely unchanged during the clouding transition.

Conclusions:

  • The coil-globule transition and aggregation of PDEAM chains can occur independently of hydration shell structural changes.
  • PDEAM's hydration shell is less sensitive to temperature-induced transitions than PNIPAM's.