Rheological Behavior of Tough PVP-in Situ-PAAm Hydrogels Physically Cross-Linked by Cooperative Hydrogen Bonding
Version 2 2016-11-02, 13:52
Version 1 2016-10-21, 17:58
Posted on 2016-10-21 - 00:00
Rheology studies were performed on
tough PVP-in situ-PAAm hydrogels physically cross-linked
by cooperative hydrogen bonding
to understand their viscoelastic response and, hence, the interactions
and microstructure. The viscoelasticity of the PVP-in situ-PAAm hydrogels was strongly affected by the monomer ratio (CAAm/CVP). Hydrogels
prepared with a high monomer ratio exhibited weak time, temperature
and frequency dependence of the viscoelastic properties, similar to
those of chemically cross-linked hydrogels. The storage modulus (G′) of the gels was much greater than the loss moduli
(G″) and low loss factor (tan δ <
∼ 0.1), which indicated that they were solid-like, and mostly
elastic. These supramolecular gels exhibited a strain- and CAAm/CVP-dependent
reversible gel (solid) to viscoelastic liquid transition due to the
dynamic nature of the cooperative hydrogen bonds. That transition
also coincided with the onset of nonlinear viscoelastic behavior.
The addition of a low molecular weight compound, urea, that competes
for hydrogen bonding sites weakens the gel by decreasing the effective
cross-link density or weakening the intermolecular hydrogen bonding.
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Song, Guoshan; Zhao, Zhiyang; Peng, Xin; He, Changcheng; Weiss, R. A.; Wang, Huiliang (2016). Rheological Behavior of Tough PVP-in Situ-PAAm Hydrogels Physically Cross-Linked by Cooperative Hydrogen Bonding. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.6b01448
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AUTHORS (6)
GS
Guoshan Song
ZZ
Zhiyang Zhao
XP
Xin Peng
CH
Changcheng He
RW
R. A. Weiss
HW
Huiliang Wang