Phase Transitions in Swollen Networks. 3. Swelling Behavior of Radiation Cross-Linked Poly(vinyl methyl ether) in Water

Moerkerke, R.; Meeussen, Frank; Koningsveld, R.; Berghmans, Hugo; Mondelaers, W.; Schacht, Etienne; Dušek, Karel; Šolc, Karel

doi:10.1021/ma971512+

Cited by 115 publications

(114 citation statements)

References 31 publications

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“…Type III polymers [e.g. poly(methylvinylether), PMVEth] exhibit a bimodal phase diagram, presenting two critical points for low and high polymer concentrations corresponding to the Type I and Type II behaviours, respectively [116][117][118][119].…”

Section: Phenomenological Classificationmentioning

confidence: 99%

Non-ionic Thermoresponsive Polymers in Water

Aseyev

Tenhu

Winnik

2010

Advances in Polymer Science

456

511

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Numerous non-ionic thermally responsive homopolymers phase separate from their aqueous solutions upon heating. Far fewer neutral homopolymers are known to phase separate upon cooling. A systematic compilation of the polymers reported to exhibit thermoresponsive behaviour is presented in this review, including N-substituted poly[(meth)acrylamide]s, poly(N-vinylamide)s, poly(oxazoline)s, protein-related polymers, poly(ether)s, polymers based on amphiphilic balance, and elastin-like synthetic polymers. Basic properties of aqueous solutions of these polymers are briefly described.

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Section: Phenomenological Classificationmentioning

confidence: 99%

Non-ionic Thermoresponsive Polymers in Water

Aseyev

Tenhu

Winnik

2010

Advances in Polymer Science

456

511

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“…[108,109] Under mild conditions of pH and temperature, hydrogel can be synthesized by high energy radiations mediated crosslinking keeping in mind the avoidance of usage of toxic crosslinking agents.…”

Section: Chemical Crosslinking Via High Energy Irradiationmentioning

confidence: 99%

Insight into hydrogels

Khan

Ullah

et al. 2016

Designed Monomers and Polymers

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The development and introduction of injectable biomaterials and the identification of methods through which materials may form in situ are currently the topics of interest in materials science, specifically in the field of biomaterials. Over the last few decades, hydrogels which refers to the swellable polymeric matrices have gained wide attention due to their excellent characteristics such as swelling in different media, pH and temperature sensitivity, and sensitivity to other stimuli. Nowadays, injectable hydrogels have widely been studied due to their excellent insitu gelation at body temperature. These injectable insitu gels serve as depot system which ensures the local and systemic drug and gene delivery. These insitu gels also protect the proteins and peptide drugs invivo from environmental effect. The current review is made to report latest extensive literature regarding hydrogels, their classification, synthesis methods, structure of hydrogel network, methods of crosslinking, environment-sensitive hydrogel system, drug loading, and release, hydrogels as biosensors and applications of hydrogels.

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“…Heskins and Guillet 14 explained the phase separation behavior of water-soluble polymer by Flory-Huggins lattice theory in terms of thermodynamics. To describe the different types of phase separation which have been experimentally discovered, Berghmans [15][16][17][18] introduced extensive concentration dependence as a cubic polynomial function to get a better fit of the experiment data. In this respect, three types have been defined, among these, PVME belongs to type III 17 which is characterized by a bimodal demixing curve.…”

Section: Introductionmentioning

confidence: 99%

“…To describe the different types of phase separation which have been experimentally discovered, Berghmans [15][16][17][18] introduced extensive concentration dependence as a cubic polynomial function to get a better fit of the experiment data. In this respect, three types have been defined, among these, PVME belongs to type III 17 which is characterized by a bimodal demixing curve. In this case, two critical points exist in the phase transition: one is equal to zero at θ temperature, the other is almost independent of the molecular mass.…”

Section: Introductionmentioning

confidence: 99%

FT-IR and 2D-IR Spectroscopic Studies on the Effect of Ions on the Phase Separation Behavior of PVME Aqueous Solution

2007

ANAL. SCI.

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Aqueous solutions of some water-soluble polymers have drawn considerable interest as they exhibit phase separation above the critical temperature (LCST). [1][2][3][4] In such processes the polymer experiences great and reversible changes in its conformation and volume. Some typical examples of such polymers are poly(N-substituted acrylamide)s and poly(vinyl ether)s, which have amide or ether oxygen groups as hydrophilic moieties. In contrast to poly(ethylene oxide) (PEO) 5 and poly(propylene oxide) (PPO), 6 which usually have LCST values higher than 100˚C, poly(vinyl methyl ether) (PVME) has a lower critical separation temperature at a moderate temperature range around 35˚C which makes it suitable for industrial and medical applications such as actuators, 7 artificial muscles, 8 drug delivery systems, 9,10 and thermoresponsive surfaces. 11,12 The phase behavior of water-soluble polymer in aqueous solution reflects the interactions between polymer segments and water molecule. 13 PVME has a hydrophilic ether group, which can stabilize the aqueous solution by forming hydrogen bonds, and a hydrophobic part, which can destabilize the solution by altering bulk water. The hydrophobic interaction increases monotonously during heating, which finally breaks the balance between the hydrogen bonding and hydrophobic interaction and induces the phase separation. Heskins and Guillet 14 explained the phase separation behavior of water-soluble polymer by Flory-Huggins lattice theory in terms of thermodynamics. To describe the different types of phase separation which have been experimentally discovered, Berghmans 15-18 introduced extensive concentration dependence as a cubic polynomial function to get a better fit of the experiment data. In this respect, three types have been defined, among these, PVME belongs to type III 17 which is characterized by a bimodal demixing curve. In this case, two critical points exist in the phase transition: one is equal to zero at θ temperature, the other is almost independent of the molecular mass. This result has been confirmed by other scientists. [19][20][21][22] Maeda et al. 20 found that the phase separation of PVME proceeds in two successive steps by DSC, while Durme et al. 19 revealed that the initial stage of phase separation, above LCST, is followed by large compositional changes upon passing the temperature for the three-phase equilibrium.In order to control the phase separation temperature of PVME aqueous solution, many studies have been carried out on the systems of PVME aqueous solutions with different kinds of additives. Spevacek et al. investigated PVME/D2O system by NMR methods. [22][23][24] Schild et al. 13 have revealed that the LCST of PVME gradually increased with the increase of the concentration of methanol, while Horne et al. 25 have investigated the effects of electrolytes, urea and alcohols on the phase separation of PVME. Maeda et al. have examined the effects of inorganic 20 ions and tetraalkylammonium 26 ions on the LCST of PVME by IR and Raman spectroscopy. Durm...

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Phase Transitions in Swollen Networks. 3. Swelling Behavior of Radiation Cross-Linked Poly(vinyl methyl ether) in Water

Cited by 115 publications

References 31 publications

Non-ionic Thermoresponsive Polymers in Water

Non-ionic Thermoresponsive Polymers in Water

Insight into hydrogels

FT-IR and 2D-IR Spectroscopic Studies on the Effect of Ions on the Phase Separation Behavior of PVME Aqueous Solution

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