Analogy between Swelling of Gels and Intrinsic Viscosity of Polymer Solutions for Ion-Complexed Poly(vinyl alcohol) in Aqueous Medium

Shibayama, Mitsuhiro; Uesaka, Masao; Inamoto, Satoshi; Mihara, Hideto; Nomura, Shunji

doi:10.1021/ma951194j

Cited by 34 publications

(24 citation statements)

References 27 publications

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“…This shear thinning behavior observed at high frequency is ascribed to the occurrence of a shear‐induced phase separation. The phase separation condition of the polymer solutions were determined by monitoring the sharp drop of measured viscosity during the increase of frequency 11, 14, 20. However, a different behavior was observed for the PVA‐13 solution, which exhibited almost Newtonian character over the frequency range examined.…”

Section: Resultsmentioning

confidence: 99%

“…It is likely that the mechanical properties of PVA solutions are highly dependent on the formation of inter‐ or intra‐molecular hydrogen bonds between OH groups. Moreover, inter‐ or intra‐molecular hydrogen bonding may bring about complicated phenomena such as phase separation and gelation, which means the solution properties exhibit time‐dependence 8–11. However, the relationships between the bonding and these phenomena have not yet been discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

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Characteristic rheological features of high concentration PVA solutions in water with different degrees of polymerization

Gao

Yang

et al. 2010

J of Applied Polymer Sci

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This work aims to study the impact of the degree of polymerization (Pn) on the rheological behavior of PVA solutions (15 wt %) under steady and oscillatory shear conditions. The values of Pn range from 1300 to 2400. The results show that PVA-13 solution exhibits almost Newtonian flow behavior, whereas high Pn PVA solutions exhibit shear thinning behavior, for which the complex viscosity increases with Pn. However, the shear viscosity of PVA-24 is lower than that of PVA-20 at low shear rate (<1 s À1 ). In addition, the storage modulus of PVA solutions increases with increasing degree of polymerization from 1300 to 2000. There is a sharp increase at degrees of polymerization higher than 1300. However, the storage modulus of PVA-24 is lower than that of PVA-17 and PVA-20 at low shear rate (<1 rad/s). The viscoelastic exponent of the PVA solutions shows a minimum value at degree of polymerization 2000. Thixotropy is detected by a hysteresis loop of the flow curves. The creep response of PVA solutions has also been investigated, with PVA-24 showing negligible compliance recovery. These facts indicate that increasing Pn produces a corresponding effect in varying the molecular structure and types of hydrogen bonding, including intra-and inter-chain, and polymer-water hydrogen bonding. Rheological parameters (G 0 , n, tand, J, and so on) can be used to evaluate the change in the molecular structure and type of hydrogen bonding.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristic rheological features of high concentration PVA solutions in water with different degrees of polymerization

Gao

Yang

et al. 2010

J of Applied Polymer Sci

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“…The data obtained from the earlier investigated interpolymer complex of the linear polymers 14,16) showed that the organic solvent dimethyl sulfoxide is responsible for both the destruction of the hydrogen bonds and decreasing hydrophobic interactions. Taking into account an analogy of the one-to-one correspondence in the size of a single polymer chain in solution with that of subchain in a network 18) one can expect the same behaviour of both the K S and the intrinsic viscosity [g] of the corresponding complexes. The dependences of K S of 1a -2 complexes and of [g] of 1 -2 complexes on water/dimethyl sulfoxide compositions are presented in Fig.…”

Section: Influence Of Water/dimethyl Sulfoxide Compositions On the Bementioning

confidence: 99%

Swelling behaviour of a non-ionic poly(N-vinyl-2-pyrrolidone) gel in a linear poly(acrylic acid) solution

Bekturov¹,

Frolova

Bimendina

1999

Macromol. Chem. Phys.

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SUMMARY:The swelling behaviour of a non-ionic poly(N-vinyl-2-pyrrolidone) hydrogel in a linear poly-(acrylic acid) solution upon the influence of chain length, pH, ionic strength, and water/dimethyl sulfoxide composition was studied. The sharp shrinkage of the gel volume within a narrow range of polyacid concentration takes place as a result of the formation of an intermacromolecular gel-polymer complex on the base of hydrogen bonding. According to X-ray diffraction this complex is amorphous. The formation of the gel-polymer complex is a long term process and the system reaches equilibrium within 48 h. The swelling behaviour strongly depends on the chain length of the polyacid whereas it does not depend on the ionic strength. With increasing pH value and changing water/dimethyl sulfoxide composition the gel reswelling is induced. The complex formation with poly(acrylic acid) occurs in the same way for linear and crosslinked poly(N-vinyl-2-pyrrolidone).

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“…[27][28][29][30] When mechanically constrained, responsive hydrogels exert swelling forces on the constraining structures. A hydrogel's response may be continuous or discrete, depending on the nature of the hydrogel and the applied stimulus.…”

Section: Introductionmentioning

confidence: 99%

Integration of Hydrogels with Hard and Soft Microstructures

Lei¹,

Ziaie²,

Nuxoll³

et al. 2007

j nanosci nanotechnol

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Hydrogels, i.e., water-swollen polymer networks, have been studied and utilized for decades. These materials can either passively support mass transport, or can actively respond in their swelling properties, enabling modulation of mass and fluid transport, and chemomechanical actuation. Response rates increase with decreasing hydrogel dimension. In this paper, we present three examples where incorporation of hydrogels into solid microstructures permits acceleration of their response, and also provides novel functional capabilities. In the first example, a hydrogel is immobilized inside microfabricated pores within a thin silicon membrane. This hydrogel does not have a swelling response under the conditions investigated, but under proper conditions it can be utilized as a part of an electrolytic diode. In the second example, hydrogels are polymerized under microcantilever beams, and their swelling response to pH or glucose concentration causes variable deflection of the beam, observable under a microscope. In the third example, swelling and shrinking of a hydrogel embedded in a microfabricated valve structure leads to chemical gating of fluid motion through that valve. In all cases, the small size of the system enhances its response rate.

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Analogy between Swelling of Gels and Intrinsic Viscosity of Polymer Solutions for Ion-Complexed Poly(vinyl alcohol) in Aqueous Medium

Cited by 34 publications

References 27 publications

Characteristic rheological features of high concentration PVA solutions in water with different degrees of polymerization

Characteristic rheological features of high concentration PVA solutions in water with different degrees of polymerization

Swelling behaviour of a non-ionic poly(N-vinyl-2-pyrrolidone) gel in a linear poly(acrylic acid) solution

Integration of Hydrogels with Hard and Soft Microstructures

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