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Related Experiment Video

Updated: May 21, 2026

Preparation of Hydroxy-PAAm Hydrogels for Decoupling the Effects of Mechanotransduction Cues
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Multi-Responsive PAA/PNIPAM Semi-IPN Hydrogel Properties Controlled by PAA Topology.

Suraj Aswale1, Gyeong Min Choi2, Hyerin Kang1

  • 1Department of Polymer Science and Engineering, Pusan National University, Busan, Republic of Korea.

Macromolecular Rapid Communications
|May 20, 2026
PubMed
Summary

Polymer topology significantly impacts hydrogel properties. Cyclic poly(acrylic acid) (PAA) in poly(N-isopropylacrylamide) (PNIPAM) hydrogels offers controlled swelling and unique mechanical stability compared to linear PAA.

Keywords:
Poly(N‐isopropylacrylamide)rheologysemi‐IPNtopology

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Published on: February 27, 2016

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Polymer topology is a critical factor in hydrogel design, influencing properties beyond chemical composition.
  • Poly(N-isopropylacrylamide) (PNIPAM) hydrogels exhibit thermoresponsive behavior, making them suitable for various applications.
  • Poly(acrylic acid) (PAA) is a common component in hydrogel formulations, but its topological influence is less explored.

Purpose of the Study:

  • To investigate the impact of linear versus cyclic poly(acrylic acid) (PAA) topology on poly(N-isopropylacrylamide) (PNIPAM) based semi-interpenetrating polymer networks (semi-IPNs).
  • To evaluate how different PAA topologies affect hydrogel swelling behavior and mechanical properties under varying pH and thermal conditions.
  • To elucidate the role of polymer architecture in tuning the performance of PNIPAM hydrogels.

Main Methods:

  • Synthesis and characterization of linear and cyclic poly(acrylic acid) (PAA) using 1H NMR, SEC, and DSC.
  • Incorporation of PAA topologies into PNIPAM hydrogels to form semi-IPNs.
  • Swelling experiments at varying pH and rheological analyses to assess mechanical properties.

Main Results:

  • Hydrogels with cyclic PAA exhibited significantly lower and more controlled swelling across different pH levels compared to those with linear PAA.
  • The incorporation of PAA topologies generally decreased the overall mechanical strength of the PNIPAM hydrogel.
  • Cyclic PAA/PNIPAM hydrogels showed enhanced network stability in the hydrated state, while linear PAA/PNIPAM hydrogels displayed higher mechanical strength upon thermal de-swelling.

Conclusions:

  • Polymer topology, specifically the cyclic nature of PAA, plays a crucial role in modulating the swelling and mechanical characteristics of PNIPAM hydrogels.
  • The structural constraints of cyclic PAA provide controlled swelling and improved stability in hydrated PNIPAM networks.
  • This study highlights the potential of topological polymer design for fine-tuning hydrogel properties for specific applications.