Equilibrium swelling behavior and elastic properties of polymer–clay nanocomposite hydrogels

2008 ◽  
Vol 109 (6) ◽  
pp. 3714-3724 ◽  
Author(s):  
Suzan Abdurrahmanoglu ◽  
Volkan Can ◽  
Oguz Okay
Keyword(s):  
Elastic Properties ◽  
Swelling Behavior ◽  
Nanocomposite Hydrogels ◽  
Polymer Clay Nanocomposite ◽  
Equilibrium Swelling

Unusual swelling behavior of polymer–clay nanocomposite hydrogels

Polymer ◽  
2007 ◽  
Vol 48 (17) ◽  
pp. 5016-5023 ◽  
Author(s):  
Volkan Can ◽  
Suzan Abdurrahmanoglu ◽  
Oguz Okay
Keyword(s):  
Swelling Behavior ◽  
Nanocomposite Hydrogels ◽  
Polymer Clay Nanocomposite

Equilibrium swelling behavior of thermally responsive metal affinity hydrogels, Part I: Compositional effects

Polymer ◽  
2008 ◽  
Vol 49 (17) ◽  
pp. 3737-3743 ◽  
Author(s):  
Ganesh Iyer ◽  
L.M. Viranga Tillekeratne ◽  
Maria R. Coleman ◽  
Arunan Nadarajah
Keyword(s):  
Swelling Behavior ◽  
Metal Affinity ◽  
Thermally Responsive ◽  
Equilibrium Swelling ◽  
Compositional Effects

Thermodynamic Properties and Polymer Solvent Interaction Parameters for Silicone Rubber Networks

1968 ◽  
Vol 41 (3) ◽  
pp. 608-620 ◽  
Author(s):  
R. D. Seeley
Keyword(s):  
Thermodynamic Properties ◽  
Network Structure ◽  
Silicone Rubber ◽  
Volume Fraction ◽  
Swelling Behavior ◽  
Effective Number ◽  
Solvent Interaction ◽  
Molecular Weights ◽  
Linear Relationships ◽  
Equilibrium Swelling

Abstract The relationships of the volume fraction of rubber (silica reinforced silicone rubber vulcanizates) at equilibrium swelling to a corresponding solvent-rubber interaction parameter have been found to agree quite well with theory throughout the entire range of volume fractions investigated. Composite sigmoidal curves were constructed from the ϕrs versus μ data for the different vulcanizates. Temperature and solvent effects were found to merely shift the plotting points along the curves for the respective vulcanizates. Contrary to other work linear relationships between ϕrs and μ were found in this investigation only in the range of moderate dilations. Such relationships could lead to serious misinterpretations if the investigations involved ϕrs versus μ data near an inflection point. Thus, the value of μ relative to a corresponding ϕrs not only depend upon solvent (s) and temperature, but also upon the level of vulcanization at moderate to high dilations. The entropy, enthalpy, and free energy changes associated with the configurational changes occurring in the network structure of the rubber were calculated. The thermodynamic properties were found to be consistent and uniform throughout the dilation range. Limiting osmotic pressures were determined to obtain effective number average molecular weights of the crosslinked chains. The molecular weight values were found to average slightly less than three times those obtainable from ve/Vr data. Finally, this investigation has shown that reinforced silicone rubber vulcanizates at equilibrium swelling in a variety of solvents exhibit the swelling behavior predicted by theory. However, swelling behavior at moderate to high swelling was found to be unrelated to the rubber in general, but related more specifically to the network structure of the vulcanizate. At low dilations, the characteristics of the silicone rubber species control the swelling behavior.

Morphologically Well-defined Gold Nanoparticles Embedded in Thermo-Responsive Hydrogel Matrices

2004 ◽  
Vol 820 ◽  
Author(s):  
Chun Wang ◽  
Nolan T. Flynn ◽  
Robert Langer
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Nanocomposite Materials ◽  
Thiol Groups ◽  
Surface Charges ◽  
Bulk Properties ◽  
Nanocomposite Hydrogels ◽  
Long Term Stability ◽  
Equilibrium Swelling

AbstractNanocomposite materials consisting of colloidal gold (Au) nanoparticles embedded in thermo-responsive poly(N-isopropylacrylamide) (PNIPAm) hydrogels are synthesized. Thiol groups that bind to both Au3+ ions and colloidal Au are incorporated into the side-chains of the PNIPAm hydrogels through copolymerization. This report describes formation of morphologically well-defined Au nanoparticles with varying long-term stability inside the hydrogel matrices containing adjustable concentrations of thiols. Compared with the non-Au containing PNIPAm hydrogels, the Au-PNIPAm nanocomposite hydrogels have shown higher degrees of equilibrium swelling and different temperature-triggered phase transitions. It is hypothesized that these remarkable changes in hydrogel bulk properties are related to the different morphologies and sizes, and possibly the amount of surface charges, of the Au nanoparticles.

Swelling behavior of poly(acrylamide)/clay nanocomposite hydrogels in acrylamide aqueous solution

2009 ◽  
Vol 112 (1) ◽  
pp. 353-358 ◽  
Author(s):  
Yongmei Jiang ◽  
Meifang Zhu ◽  
Biao Li ◽  
Yang Liu ◽  
Zongyi Qin ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Swelling Behavior ◽  
Nanocomposite Hydrogels ◽  
Poly Acrylamide

Effects of NR and Liquid NR Loading on Swelling Behaviour of TPU/NR Blends

2013 ◽  
Vol 795 ◽  
pp. 133-136
Author(s):  
Nor Azwin Ahad ◽  
Sahrim Haji Ahmad ◽  
Norazwani Muhammad Zain
Keyword(s):  
Natural Rubber ◽  
Thermoplastic Polyurethane ◽  
Swelling Behavior ◽  
Melt Blending ◽  
Swelling Behaviour ◽  
Blend Ratio ◽  
Equilibrium Swelling ◽  
Liquid Natural Rubber ◽  
Higher Temperature ◽  
Blend Ratios

The blends of thermoplastic polyurethane (TPU) with natural rubber (NR) at four different blend ratios were prepared via melt blending at 180°C and 190°C, with addition of liquid natural rubber (LNR) as compatibilizer. The effect of blend ratio and temperature swelling index was studied. The equilibrium swelling index of TPU and its blend increase with increasing of NR, because of the easiness for solvent to diffuse into the gap between rubber molecules. The temperatures of blending also give effect to swelling behavior. Swelling index of all samples was higher when mixed the blends at higher temperature.

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