Reentrant swelling behavior of thermosensitive N-isopropylacrylamide nano-sized gel particles

Jung, Sang Chul; Oh, Suk Yung; Bae, Young Chan

doi:10.1016/j.polymer.2009.05.011

Cited by 38 publications

(17 citation statements)

References 34 publications

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“…Freitas and co‐workers suggested an extended version of a quasi‐chemical thermodynamic model taking into account the competition between hydrogen bonding and dispersion forces. In recent studies of PNIPA gels, the swelling behaviors of the gels in ternary systems have been investigated due to intriguing phenomenon by adding various solvents in aqueous PNIPA solutions . Lian et al developed a lattice molecular thermodynamic model for describing the swelling behaviors of thermally sensitive core–shell hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Swelling Behaviors of Poly(N‐isopropylacrylamide) Nanosized Hydrogel Particles/Poly(vinyl alcohol)/Water Systems: Effect of the Degree of Hydrolysis of PVA

Kim

Choi

Bae

2013

Macro Chemistry & Physics

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Using poly(vinyl alcohol) as a drug model, the swelling behaviors of thermosensitive poly(N‐isopropylacrylamide) gel with various concentrations of PVA are investigated. The swelling ratio in PVA9000 is larger than that of PVA89000 at the same composition because the fully hydrolyzed PVA acts as a steric hindrance. A lattice‐based molecular thermodynamic model is used to obtain interaction parameters and then directly applied to describe the swelling behaviors of the gel. Using only one adjustable parameter, the PVA selectivity can be theoretically predicted and the ternary phase diagrams of PNIPA/water/PVA system can be generated. Lastly, the calculated results are compared with the swelling data for PNIPA/PVA copolymer gel, and are found to be in good agreement with the proposed model.

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Section: Introductionmentioning

confidence: 99%

Swelling Behaviors of Poly(N‐isopropylacrylamide) Nanosized Hydrogel Particles/Poly(vinyl alcohol)/Water Systems: Effect of the Degree of Hydrolysis of PVA

Kim

Choi

Bae

2013

Macro Chemistry & Physics

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“…Influence of solvent composition and temperature on the swelling of a poly(N-isopropylacrylamide) (PNIPA) gel PNIPA and PNIPA gels are known to exhibit concave solubility or degree of swelling curves in a mixture of an organic solvent and water [27][28][29][30] . Depending on the composition of the mixed solvent, even when the monomer is dissolved in the solvent system, the resultant polymer may not stay dissolved.…”

Section: Synthesis Of a Four-branched Star Polymer By The Multifunctimentioning

confidence: 99%

Spontaneous synthesis of a homogeneous thermoresponsive polymer network composed of polymers with a narrow molecular weight distribution

et al. 2018

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We have developed a method to obtain a polymer gel consisting of a relatively homogeneous network structure composed of polymers with a narrow molecular weight simply by mixing the necessary compounds. In this method, a radical chain polymerization reaction with a fast reaction rate is combined with a radical addition cross-linking reaction that has a sufficiently slow reaction rate compared with the polymerization reaction. For the polymerization reaction, a multifunctional initiator with a strictly controlled number of polymerization initiation sites was used to prepare a star polymer with a chain number and length determined by living radical polymerization. In the cross-linking reaction, a multifunctional terminating agent was used to prepare a star polymer from a polymer with a narrow molecular weight via living radical polymerization followed by coupling with multiple polymer chains using a termination reaction. As a result, two kinds of reactions with greatly different kinetics occurred sequentially only when all of the compounds were mixed and allowed to stand at a constant temperature, and a relatively homogeneous network structure comprising cross-linked polymers with a low molecular weight distribution was inherently constructed.

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“…Currently, DLS is used on a routine basis for the analysis of particle sizes in the sub micrometer range; it provides an estimation of the average size and its distribution within a measuring time of a few minutes. However, improvements in the ability to model dynamic behavior and relate it to scattering data has continued to make it a useful tool to study slow effects such as swelling mechanisms and phase transitions [117][118][119][120][121][122][123][124][125][126][127]. Still, XPCS is considered superior to DLS in certain situations because 1) it enables high-q dynamics and 2) it can probe samples that are opaque or subject to multiple light scattering phenomena under DLS conditions.…”

Section: Time-resolved Dynamics With Photon Correlation Spectroscopymentioning

confidence: 99%

Combining theory and experiment for X-ray absorption spectroscopy and resonant X-ray scattering characterization of polymers

Cordova

Brady

2016

Polymer

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An improved understanding of fundamental chemistry, electronic structure, morphology, and dynamics in polymers and soft materials requires advanced characterization techniques that are amenable to in situ and in operando studies. Soft X-ray methods are especially useful in their ability to non-destructively provide material or chemical moiety specific information. Analysis of these experiments, which can be very dependent on X-ray energy and polarization, can quickly become complex. Complementary modeling and predictive capabilities are required to properly probe these critical features. Here, we present relevant background on this emerging suite of techniques. We focus on how the combination of theory and experiment has been applied and can be further developed to drive our understanding of how these methods probe relevant chemistry, structure, and dynamics in soft materials.

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Reentrant swelling behavior of thermosensitive N-isopropylacrylamide nano-sized gel particles

Cited by 38 publications

References 34 publications

Swelling Behaviors of Poly(N‐isopropylacrylamide) Nanosized Hydrogel Particles/Poly(vinyl alcohol)/Water Systems: Effect of the Degree of Hydrolysis of PVA

Swelling Behaviors of Poly(N‐isopropylacrylamide) Nanosized Hydrogel Particles/Poly(vinyl alcohol)/Water Systems: Effect of the Degree of Hydrolysis of PVA

Spontaneous synthesis of a homogeneous thermoresponsive polymer network composed of polymers with a narrow molecular weight distribution

Combining theory and experiment for X-ray absorption spectroscopy and resonant X-ray scattering characterization of polymers

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