Deformational, swelling, and potentiometric behavior of ionized poly(methacrylic acid) gels. I. Theory

Hasa, J.; Ilavský, M.; Dušek, Karel

doi:10.1002/pol.1975.180130203

Cited by 136 publications

(105 citation statements)

References 12 publications

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“…The results presented on the swelling behaviour of kraft lignin networks are in qualitative agreement with the expected behaviour of polyelectrolytic networks as regards the effects of pH, ionic strength and degree of cross-linking (21)(22)(23)(24). The lack of specificity to monovalent metal ions in promoting swelling further encourages this view.…”

Section: Discussionsupporting

confidence: 85%

The colloidal behaviour of kraft lignin III. Swelling behaviour and mechanical properties of kraft lignin gels

Lindström

Westman

1980

Colloid Polymer Sci

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Section: Discussionsupporting

confidence: 85%

The colloidal behaviour of kraft lignin III. Swelling behaviour and mechanical properties of kraft lignin gels

Lindström

Westman

1980

Colloid Polymer Sci

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“…1 to ca. 100 mM [3][4][5][6][7][8][9][10][11][12][13][14] . At sufficiently large ionic strength, swelling is no longer sensitive to the polymer's degree of ionization or to ionic strength.…”

Section: Introductionmentioning

confidence: 99%

Molecular thermodynamics for swelling of a mesoscopic ionomer gel in 1 : 1 salt solutions

Victorov

Radke

Prausnitz

2006

Phys. Chem. Chem. Phys.

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For a microphase-separated diblock copolymer ionic gel swollen in salt solution, a molecular-thermodynamic model is based on the self-consistent field theory in the limit of strongly segregated copolymer subchains. The geometry of microdomains is described using the Milner generic wedge construction neglecting the packing frustration. Thermodynamic functions are expressed analytically for gels of lamellar, bicontinuous, cylindrical and spherical morphologies. Molecules are characterized by chain composition, length, rigidity, degree of ionization, and by effective polymer-polymer and polymer-solvent interaction parameters.The model predicts equilibrium solvent uptakes and the equilibrium microdomain spacing for gels swollen in salt solutions. Results are given for details of the gel structure: distribution of mobile ions and polymer segments, and the electric potential across microdomains. Apart from effects obtained by coupling classical Flory-Rehner theory with Donnan equilibria, viz., increased swelling with polyelectrolyte charge and shrinking of gel upon addition of salt, the model predicts the effects of microphase morphology on swelling.

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“…Electrostatic forces can also contribute to the swelling of polyelectrolyte gels, though it is generally less significant than the ionic contributions. 39,40 As shown in Figure 1 for MCS-PEGDA copolymers, the swelling ratio decreased with increasing the PEGDA content of the gels, with pure PEGDA as the least swollen gel in each group. Increasing the nonionic PEGDA content in constant polymer fraction would lead to a reduction of the total concentration of ionized MCS groups in the gel, thus reducing the swelling osmotic pressure of the copolymer gel.…”

Section: Swellingmentioning

confidence: 88%

“…This interpretation is also consistent with the idea of changes in the number of statistical chain segments with salt. 39 While a lower number of statistical segments would result in stiff polymer chains with non-Gaussian statistics, increased number of statistical segments with salt would result in a higher number of conformations for the chain, lower moduli, and eventually higher fracture strains. Additional crosslinking simply shortens the distance between the crosslinks without substantially perturbing the chain conformation in relatively lightly crosslinked polyelectrolyte gels.…”

Section: Fracture Strainmentioning

confidence: 99%

“…41,[50][51][52] For such stiff polymers, deviations of shear modulus from Gaussian distribution occur at much lower chain extensions (small strains) than for flexible coil polymers like poly(acrylic acid). 39,48,[56][57][58] For polyelectrolytes, the persistence length of the polymer chain can be modeled as having two independent components: the inherent and the electrostatic. 50,51,55,59 Increasing salt concentration reduces the electrostatic component while having little effect on the inherent persistence length.…”

Section: Presence Of Salt Swelling and Modulimentioning

confidence: 99%

See 1 more Smart Citation

Structurally diverse and readily tunable photocrosslinked chondroitin sulfate based copolymers

Khanlari

Suekama

Detamore

et al. 2015

J Polym Sci B Polym Phys

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Our group has previously reported on successful biofunctionalization of poly(ethylene glycol diacrylate) (PEGDA) gels using chondroitin sulfate (CS) and improving moduli of methacrylated-CS (MCS) gels using short PEGDA comonomers. Here, we focused on understanding the composition-property relationship of MCS-PEGDA copolymers. By changing concentration, composition, and medium's ionic strength the gels were modified to show a diverse range of properties. Photopolymerized copolymers with >4:1 ratio of one component had compressive moduli of up to 24 times higher and up to 17 times lower swelling degree (q) than those of MCS alone. The increased moduli and lowered q were consistent with the hypothesis that PEGDA improves kinetic chain growth by overcoming the steric hindrances of the macromer. The swelling and moduli of the gels were tuned by changing the ratio of the comonomers. The swelling and moduli of the gels were lowered with presence of salt in solution while the fracture strain increased. These changes were hypothesized to be the result of transition of CS chain conformation from highly extended and non-Gaussian to less extended and Gaussian distribution. The complete understanding of MCS-PEGDA compositionproperty relationship provides a general strategy to tune the moduli or q of polysaccharide-based hydrogels while avoiding undesirable phase separation. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 1070-1079 KEYWORDS: biomaterials; copolymers; hydrogels; mechanical properties; photopolymerization INTRODUCTION The mammalian extracellular matrix (ECM) is a multicomponent, hierarchically ordered structure. Chondroitin sulfate (CS) and hyaluronic acid (HA) are two of the main glycosaminoglycans (GAGs) present in the mammalian ECM. Collagen type II, keratan sulfate, and proteins are other major ECM components. Regeneration of the damaged ECM has been the focus of multiple tissue engineering studies. A common strategy is to replace the damaged matrix with naturally available biomimetic materials. An optimal scaffold to mimic the ECM would be made of multiple components to provide the appropriate balance of mechanical properties, water content, solute permeability, and cell interactions.

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Deformational, swelling, and potentiometric behavior of ionized poly(methacrylic acid) gels. I. Theory

Cited by 136 publications

References 12 publications

The colloidal behaviour of kraft lignin III. Swelling behaviour and mechanical properties of kraft lignin gels

The colloidal behaviour of kraft lignin III. Swelling behaviour and mechanical properties of kraft lignin gels

Molecular thermodynamics for swelling of a mesoscopic ionomer gel in 1 : 1 salt solutions

Structurally diverse and readily tunable photocrosslinked chondroitin sulfate based copolymers

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