scholarly journals Model networks of end‐linked polydimethylsiloxane chains. I. Comparisons between experimental and theoretical values of the elastic modulus and the equilibrium degree of swelling

1977 ◽  
Vol 66 (3) ◽  
pp. 1006-1011 ◽  
Author(s):  
J. E. Mark ◽  
J. L. Sullivan
Keyword(s):  
Elastic Modulus ◽  
Equilibrium Degree ◽  
Degree Of Swelling ◽  
Model Networks

Estimation, from Swelling, of the Structural Contribution of Chemical Reactions to the Vulcanization of Natural Rubber. Part II. Estimation of Equilibrium Degree of Swelling

1964 ◽  
Vol 37 (2) ◽  
pp. 571-575 ◽  
Author(s):  
Bryan Ellis ◽  
G. N. Welding
Keyword(s):  
Natural Rubber ◽  
Chemical Reactions ◽  
Volume Fraction ◽  
Equilibrium Degree ◽  
Degree Of Swelling ◽  
Rubber Part ◽  
Structural Contribution

Abstract An investigation has been made of the measurement of degree of swelling of vulcanizates and the estimation of υτ, the volume fraction of polymer in a vulcanizate swollen to equilibrium. Methods have been established for dealing with a volatile swelling liquid, allowing for small percentages of nonpolymer in the vulcanizates, testing for diffusion equilibrium and correcting for swelling increment. The resulting values of υτ are suitable for use as described in the preceding Part I.

scholarly journals An investigation of the effects of a silicalite type zeolite on PDMS-composites

2000 ◽  
Vol 65 (3) ◽  
pp. 173-179
Author(s):  
Borivoj Adnadjevic ◽  
Jelena Jovanovic
Keyword(s):  
Thermal Stability ◽  
Polymer Network ◽  
Equilibrium Degree ◽  
Degree Of Swelling ◽  
Type Zeolite ◽  
Time Required ◽  
Reinforcing Filler

The aim of this paper was to investigate the effect of a silicalite type zeolite on PDMS-zeolite composites. The obtained results show that the introduction of a silicalite type zeolite into polysiloxane matrices results in a change of the equilibrium degree of swelling of the composites in toluene, their hardness and their thermal stability. With increasing amount of zeolite, the time required to achieve the equilibrium degree of swelling (DSe) is reduced, the DSe decreases and the hardness increases. Two ranges of the effect of the zeolite concentration on the composite characteristics were noted. At zeolite concentrations up to about 12% there are significant changes of the DSe and the hardness with zeolite concentration, while these effects are considerably less pronounced at higher concentrations. The results obtained show that the silicalite type zeolite acts as a reinforcing filler. We believe that with increasing zeolite concentration in the composite the total number of established polymer-zeolite interactions increases, as does the spatial irregularity of the polymer network, but that the density of the interactions decreases. This could be the most probably explanation for the changes in the characteristics of the composite with changing zeolite concentration.

Synthesis and Application of Electro-Thermally Sensitive Gels

2008 ◽  
Vol 61 ◽  
pp. 147-156 ◽  
Author(s):  
Karl Friedrich Arndt ◽  
Andreas Richter ◽  
Stephan Klatt ◽  
Georgi Paschew
Keyword(s):  
Phase Transition ◽  
Ph Value ◽  
Sensor Arrays ◽  
Molecular Transport ◽  
Ion Concentration ◽  
Volume Phase Transition ◽  
Equilibrium Degree ◽  
Volume Phase ◽  
Swelling Agent ◽  
Degree Of Swelling

Stimuli-sensitive change their volume (equilibrium degree of swelling), mechanical properties (elasticity, stiffness) and molecular transport properties in response to a small change in the properties of the swelling agent, like temperature, solvent composition, pH value, ion concentration, etc. Widespread used smart gels take advantages of the volume phase transition induced by a change of temperature. The temperature of volume phase transition depends on the interaction between gel and solvent. For a gel with defined chemical structure it can be changed by the composition of the swelling agent, e.g. content of salt or organic components. For application, e.g. in MEMS, an easy and controlled stimulation of volume phase transition is required. The degree of swelling (Q) and therefore the dimension of gel structures are determined by temperature. It is possible to regulate Q to a predetermined value by heating/cooling. Thermal energy inside a gel-based device can be easily generated and regulated by incorporated heating resistors and temperature sensors. Different structures (micro-spheres, pads, patterned layers) of smart hydrogels are applied. The switching between two different states of swelling is induced by changes of temperature or by changing the environment. Using the example of gel-based microvalves, sensors, sensor arrays, pumps, and chemostats (concentration control of chemical substances) the sensor-actuator properties and advantages of this group of polymers are discussed.

The influence of elastic modulus and thickness on the release of the soft-fouling green algaUlva linza(syn.Enteromorpha linza) from poly(dimethylsiloxane) (PDMS) model networks

Biofouling ◽  
2005 ◽  
Vol 21 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Manoj K Chaudhury ◽  
John A Finlay ◽  
Jun Young Chung ◽  
Maureen E Callow ◽  
James A Callow
Keyword(s):  
Elastic Modulus ◽  
Model Networks

scholarly journals Superabsorbent hydrogels made from bio-sourced butyrolactone monomer in aqueous solution

2017 ◽  
Vol 8 (39) ◽  
pp. 6039-6049 ◽  
Author(s):  
Sharmaine B. Luk ◽  
Jozef Kollár ◽  
Anna Chovancová ◽  
Miroslav Mrlík ◽  
Igor Lacík ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Radical Polymerization ◽  
Polymerization Kinetics ◽  
Equilibrium Degree ◽  
Degree Of Swelling ◽  
Kinetics Of ◽  
Superabsorbent Hydrogels

A study of the radical polymerization kinetics of sodium 4-hydroxy-4-methyl-2-methylene butanoate with acrylamide in aqueous solution provides insights to the performance of superabsorbent hydrogels synthesized with equilibrium degree of swelling in the range of 6700–59 000%.

Cationic Amphiphilic Model Networks:  Synthesis by Group Transfer Polymerization and Characterization of the Degree of Swelling

2000 ◽  
Vol 33 (8) ◽  
pp. 3176-3179 ◽  
Author(s):  
Martin R. Simmons ◽  
Edna N. Yamasaki ◽  
Costas S. Patrickios
Keyword(s):  
Group Transfer ◽  
Degree Of Swelling ◽  
Model Networks
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