Swelling behavior of radiation-polymerized polyampholytic two-component gels: Dynamic and equilibrium swelling kinetics

2003 ◽  
Vol 88 (3) ◽  
pp. 730-742 ◽  
Author(s):  
Y. K. Bhardwaj ◽  
Virendra Kumar ◽  
S. Sabharwal
Keyword(s):  
Swelling Behavior ◽  
Swelling Kinetics ◽  
Two Component ◽  
Equilibrium Swelling

Effect of Salinity and Temperature on Swelling Behavior of Nano/Micro Polymer Particle

2013 ◽  
Vol 448-453 ◽  
pp. 3993-3997
Author(s):  
Yu Lou ◽  
Wei Yao Zhu ◽  
Xue Ling Zhang ◽  
Yun Qian Long
Keyword(s):  
Oil Recovery ◽  
Polymer Particle ◽  
Swelling Behavior ◽  
Swelling Kinetics ◽  
Swelling Ratio ◽  
Polymer Particles ◽  
Equilibrium Swelling ◽  
Swelling Characteristics ◽  
Equilibrium Swelling Ratio ◽  
Kinetics Of

Nano/micro polymer particles of acrylamide (AM), acrylic acid (AA), methyl methacrylate (MMA) are used to enhance oil recovery. Swelling kinetics of nano/micro polymer particles were investigated through experimental analysis and statistical analysis. The effect of salinity and temperature on swelling behavior over time is studied experimentally. The swelling kinetics of nano/micro polymer particle was described by second order kinetics. Equilibrium swelling ratio and swelling rate were obtained through nonlinear regression. The quantitative relationships between equilibrium swelling ratio and salinity, temperature were presented. Results show that the swelling ratio increases with increasing temperature or decreasing salt concentration. The study provides a direct perspective of swelling characteristics of nano/micro polymer particles for oil recovery enhancement.

scholarly journals Synthesis of Novel Tamarind Gum-co-Poly(Acrylamidoglycolic Acid) based pH Responsive semi-IPN Hydrogels and their Ag Nanocomposites for Controlled Release of Chemotherapeutics and Inactivation of Multi Drug Resistance Bacteria

2021 ◽  
Author(s):  
Kasula Nagaraja ◽  
Kummari S.V. Krishna Rao ◽  
Sunmi Zo ◽  
Sung Soo Han ◽  
Madhusudana Rao Kummara
Keyword(s):  
Drug Delivery ◽  
Pathogenic Bacteria ◽  
Hct116 Cell ◽  
Swelling Behavior ◽  
Cancer Drug ◽  
Multi Drug Resistance ◽  
Swelling Kinetics ◽  
Klebsiella Pneumonia ◽  
Ph Responsive ◽  
Equilibrium Swelling

Novel pH responsive semi-interpenetrating polymer hydrogels based on tamarind gum-co-poly(acrylamidoglycolic acid) (TMGA) polymers have been synthesized using simple free radical polymerization in the presence of bis[2-(methacryloyloxy)ethyl] phosphate as a crosslinker and potassium persulfate as a initiator. In addition, these hydrogels have been used as templates for green synthesis of silver nanoparticles (13.4±3.6 nm in diameter, TMGA-Ag) by using leaf extract of Teminalia bellirica as reducing agent. Swelling kinetics and equilibrium swelling behavior of the TMGA hydrogels have been investigated in various pH environment the maxium % equilibrium swelling behavior observed i.e., 2882±1.2. The synthesized hydrogels and silver nanocomposites have been characterized by the UV, FTIR, XRD, SEM and TEM. TMGA and TMGA-Ag hydrogels have been investigated to study the characteristics of drug delivery and antimicrobial study. Doxorubicin hydrochloride, a chemotherapeutic agent successfully encapsulated with maximum encapulstaion efficiency i.e., 69.20±1.2 and performed in vitro release studies in pH physiological and gastric environment at 37 ℃. The drug release behavior is examined with kinetic models such as zero order, first order, Higuchi, Hixson Crowell, Korsmeyer-Peppas. These release data was the best fitted with the Korsemeyer-Peppas transport mechanism with n=0.91. Treatment effect on HCT116 Cell, human colon cancer cells were assessed with cell viability and cell cycle analysis. Antimicrobial activity of TMGA-Ag hydrogels is studied against to Staphylococcus aureus and Klebsiella pneumonia. Finally, the results demonstrate that TMGA and TMGA-Ag are promising candidates for anti-cancer drug delivery and inactivation of pathogenic bacteria, respectively.

scholarly journals Synthesis of Novel Tamarind Gum-co-poly(acrylamidoglycolic acid)-Based pH Responsive Semi-IPN Hydrogels and Their Ag Nanocomposites for Controlled Release of Chemotherapeutics and Inactivation of Multi-Drug-Resistant Bacteria

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 237
Author(s):  
Kasula Nagaraja ◽  
Kummari S. V. Krishna Rao ◽  
Sunmi Zo ◽  
Sung Soo Han ◽  
Kummara Madhususdana Rao
Keyword(s):  
Drug Delivery ◽  
Pathogenic Bacteria ◽  
In Vitro Release ◽  
Swelling Behavior ◽  
Cancer Drug ◽  
Resistant Bacteria ◽  
Swelling Kinetics ◽  
Klebsiella Pneumonia ◽  
Ph Responsive ◽  
Equilibrium Swelling

In this paper, novel pH-responsive, semi-interpenetrating polymer hydrogels based on tamarind gum-co-poly(acrylamidoglycolic acid) (TMGA) polymers were synthesized using simple free radical polymerization in the presence of bis[2-(methacryloyloxy)ethyl] phosphate as a crosslinker and potassium persulfate as a initiator. In addition, these hydrogels were used as templates for the green synthesis of silver nanoparticles (13.4 ± 3.6 nm in diameter, TMGA-Ag) by using leaf extract of Teminalia bellirica as a reducing agent. Swelling kinetics and the equilibrium swelling behavior of the TMGA hydrogels were investigated in various pH environments, and the maximum % of equilibrium swelling behavior observed was 2882 ± 1.2. The synthesized hydrogels and silver nanocomposites were characterized via UV, FTIR, XRD, SEM and TEM. TMGA and TMGA-Ag hydrogels were investigated to study the characteristics of drug delivery and antimicrobial study. Doxorubicin hydrochloride, a chemotherapeutic agent successfully encapsulated with maximum encapsulation efficiency, i.e., 69.20 ± 1.2, was used in in vitro release studies in pH physiological and gastric environments at 37 °C. The drug release behavior was examined with kinetic models such as zero-order, first-order, Higuchi, Hixson Crowell and Korsmeyer–Peppas. These release data were best fitted with the Korsemeyer–Peppas transport mechanism, with n = 0.91. The effects of treatment on HCT116 human colon cancer cells were assessed via cell viability and cell cycle analysis. The antimicrobial activity of TMGA-Ag hydrogels was studied against Staphylococcus aureus and Klebsiella pneumonia. Finally, the results demonstrate that TMGA and TMGA-Ag are promising candidates for anti-cancer drug delivery and the inactivation of pathogenic bacteria, respectively.

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.

scholarly journals Swelling Studies of Porous and Nonporous Semi-IPN Hydrogels for Sensor and Actuator Applications

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 425
Author(s):  
Daniela Franke ◽  
Gerald Gerlach
Keyword(s):  
Abrupt Change ◽  
Swelling Behavior ◽  
Template Method ◽  
Swelling Kinetics ◽  
Interpenetrating Network ◽  
Salt Solutions ◽  
Theoretical Assumptions ◽  
Different Temperatures ◽  
Swelling Studies ◽  
Kinetics Of

In this article, we present a semi-interpenetrating network (IPN) hydrogel of reasonable size with improved swelling behavior. The semi-IPN is composed of N-isopropylacrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid. Porosity was generated chemically by a surfactant-based template method. The swelling behavior was measured after an abrupt change of the temperature to 25 °C or 40 °C or after an abrupt change of the salt concentration of the aqueous medium surrounding the hydrogel samples. A set of static swelling degrees was determined from swelling measurements in salt solutions of varying concentrations and at different temperatures. Introducing porosity to the semi-IPN decreases the swelling times for most measurements while the sensor and actuator characteristics of the hydrogel found in previous studies are preserved. Additionally, we propose theoretical assumptions and explanations regarding the differences in the swelling kinetics of the porous and the nonporous semi-IPN and deduce implications for sensor and actuator applications.

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.

Equilibrium swelling behavior of thermally responsive metal affinity hydrogels, Part II: Solution effects

Polymer ◽  
2008 ◽  
Vol 49 (17) ◽  
pp. 3744-3750 ◽  
Author(s):  
Ganesh Iyer ◽  
L.M. Viranga Tillekeratne ◽  
Maria R. Coleman ◽  
Arunan Nadarajah
Keyword(s):  
Swelling Behavior ◽  
Metal Affinity ◽  
Thermally Responsive ◽  
Equilibrium Swelling

Equilibrium Swelling Behavior of Solid Supported Poly(ethylene glycol) Lipid Monolayers. Effects of Short Chain Lengths

Langmuir ◽  
2000 ◽  
Vol 16 (8) ◽  
pp. 3835-3845 ◽  
Author(s):  
Gerald Mathe ◽  
Christian Gege ◽  
Klaus R. Neumaier ◽  
Richard R. Schmidt ◽  
Erich Sackmann
Keyword(s):  
Ethylene Glycol ◽  
Swelling Behavior ◽  
Short Chain ◽  
Lipid Monolayers ◽  
Poly Ethylene Glycol ◽  
Equilibrium Swelling ◽  
Poly Ethylene ◽  
Chain Lengths
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