Solutions of Long Chain Compounds

Huggins, Maurice L.

doi:10.1063/1.1750930

Cited by 1,729 publications

(903 citation statements)

References 4 publications

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“…Equation (11) corresponds to the entropy of mixing in the Flory-Huggins model [13,14]; here we have neglected the change in the entropy due to the elasticity of the network. For a gel in which the volume of solvent is comparable to that of the networked polymer, the term in the parenthesis in (11) is of order unity, so that the osmotic pressure is on the order of Π ~ kT/Ω.…”

Section: Osmocapillary Lengthmentioning

confidence: 99%

Osmocapillary phase separation

Liu

Suo

2016

Extreme Mechanics Letters

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Abstract:A covalent network of polymer can imbibe a solvent to form a gel. In a cavity on the surface of the gel, capillary force may suck the solvent out of the gel to form a pure liquid phase. We show that such osmocapillary phase separation occurs when capillarity balances osmosis, and when the diffusion of solvent in the gel prevails over the condensation of solvent from the vapor.Osmocapillary phase separation can occur even when the gel is isolated from the vapor, or when the solvent is nonvolatile. We relate osmocapillary phase separation to phenomena of practical significance, including the wettability of gels, the transparency of gels, the liquid bridge at the tip of an atomic force microscope, the adhesion between a gel and another substance, the surface morphology of gels, and the production of tight oil.

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Section: Osmocapillary Lengthmentioning

confidence: 99%

Osmocapillary phase separation

Liu

Suo

2016

Extreme Mechanics Letters

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“…The other two principal stretches in the current state relative to a dry polymer in layer b are given by The Helmholtz free energy density of a temperature-responsive hydrogel is given by [33,34] where λ c0 1 , λ c0 2 and λ c0 3 are the three principal stretches at the current state relative to a dry polymer, N is the nominal density of the polymer chain, k is the Boltzmann constant, T is the absolute temperature, Ω is the volume per water molecule, and χ is a dimensionless measure of the strength of pair-wise interactions between species, given by [35] …”

Section: Theorymentioning

confidence: 99%

Quantifying the bending of bilayer temperature-sensitive hydrogels

Dong

Chen

2017

Proc. R. Soc. A.

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Stimuli-responsive hydrogels can serve as manipulators, including grippers, sensors, etc., where structures can undergo significant bending. Here, a finite-deformation theory is developed to quantify the evolution of the curvature of bilayer temperature-sensitive hydrogels when subjected to a temperature change. Analysis of the theory indicates that there is an optimal thickness ratio to acquire the largest curvature in the bilayer and also suggests that the sign or the magnitude of the curvature can be significantly affected by pre-stretches or small pores in the bilayer. This study may provide important guidelines in fabricating temperature-responsive bilayers with desirable mechanical performance.

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“…The Flory-Huggins theory [9,10] is one of the simplest theory describing the thermodynamics of polymer solutions. It is a lattice model in which it is assumed that each solvent molecule and polymer segment occupies exactly one lattice site.…”

Section: Phase Diagrammentioning

confidence: 99%

Trapping citronellal in a microporous polyethylene matrix

Akhtar

Focke

2015

Thermochimica Acta

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The Flory-Huggins theory was used to model the phase behaviour of linear low density polyethylene-citronellal binary mixtures. The model parameters were obtained from fitting the bimodal phase envelope using data points from cloud point determinations. This allowed the prediction of the melting point depression curve as well as the location of the spinodal region. A microporous polyethylene matrix was obtained by quenching homogeneous liquid mixtures at temperatures well below the spinodal phase boundary. This strategy makes it possible to trap, and effectively solidify, large amounts of citronellal in a polyethylene (LLDPE) matrix. This has potential implications for the development of long-lasting insect repellent bracelets and anklets.

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Solutions of Long Chain Compounds

Cited by 1,729 publications

References 4 publications

Osmocapillary phase separation

Osmocapillary phase separation

Quantifying the bending of bilayer temperature-sensitive hydrogels

Trapping citronellal in a microporous polyethylene matrix

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