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Dynamical behavior of microgels of interpenetrated polymer networks

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Abstract

Microgel suspensions of an interpenetrated Polymer Network (IPN) of PNIPAM and PAAc in D2O have been investigated through dynamic light scattering as a function of temperature, pH and concentration across the Volume Phase Transition (VPT). The dynamics of the system is slowed down under H/D isotopic substitution due to different balance states between polymer/polymer and polymer/solvent interactions suggesting the crucial role played by H-bonding. The swelling behavior, reduced with respect to PNIPAM and water, has been described by the Flory–Rehner theory, tested for PNIPAM microgel and successfully expanded to higher order for IPN microgels. Moreover the concentration dependence of the relaxation time at neutral pH has highlighted two different routes to approach the glass transition: Arrhenius and super-Arrhenius (Vogel Fulcher Tammann) respectively below and above the VPT and a fragility plot has been derived. Fragility can be tuned by changing temperature: across the VPT particles undergo a transition from soft-strong to stiff-fragile.

Graphical abstract: Dynamical behavior of microgels of interpenetrated polymer networks

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Publication details

The article was received on 13 Apr 2017, accepted on 13 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7SM00739F
Citation: Soft Matter, 2017, Advance Article
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    Dynamical behavior of microgels of interpenetrated polymer networks

    V. Nigro, R. Angelini, M. Bertoldo, F. Bruni, M. A. Ricci and B. Ruzicka, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00739F

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