Blends Expoxidized Oil/Acacia Polymeric Films and their Effect of External Stimuli on the Equilibrium Swelling Properties

2004 ◽  
Vol 1 (1) ◽  
pp. 23-34
Author(s):  
Sharif Ahmad ◽  
M. Aslam Khan ◽  
Najim Z. Khan
Keyword(s):  
Polymeric Films ◽  
Swelling Properties ◽  
Equilibrium Swelling ◽  
External Stimuli

scholarly journals RESEARCH OF INFLUENCE OF CROSS-LINKING AGENTS ON CHARACTERISTICS OF SPATIAL GRID AND PROPERTIES OF URETHANE POLYMER

2018 ◽  
Vol 59 (7) ◽  
pp. 86
Author(s):  
Inna Slepchuk ◽  
Olga Ya. Semeshko ◽  
Yuliya G. Saribekova ◽  
Irina N. Kulish ◽  
Igor V. Gorokhov
Keyword(s):  
Mechanical Properties ◽  
Functional Groups ◽  
Organic Solvents ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Polymeric Films ◽  
Cross Linking ◽  
Glycidyl Ethers ◽  
Equilibrium Swelling ◽  
Spatial Grid

Results of study of influence of amount of functional groups of glycidyl ethers on characteristics of the spatial grid of crosslinked polyurethane polymer are presented. Parameters of a three-dimensional spatial grid of investigated samples of polymeric films and their physical and mechanical properties were determined by a method of equilibrium swelling in organic solvents.

Fabrication and Characterization of Nano-Structuring Polymeric Surfaces for MEMS Applications

2008 ◽  
Author(s):  
Yusuke Takahashi ◽  
Kwok Siong Teh ◽  
Yen-Wen Lu
Keyword(s):  
Polymer Network ◽  
Electrical Potential ◽  
Polymeric Films ◽  
Surface Topology ◽  
Control Surface ◽  
Polymeric Surfaces ◽  
Active Method ◽  
Fabrication And Characterization ◽  
External Stimuli

Using external stimuli to control surface properties, such as surface topology or wettability, has been of great interest. This paper presents the fabrication, mechanism, and analysis of an active method that modulates surface nano-topology and wettability of polymeric films. The polymeric film possesses the unique property of electrical potential-induced wettability conversion: when its doping level is electrically altered, the interstitial ions are incorporated or released, causing the polymer network to stretch and thereby changing its surface morphology.

scholarly journals Semi-interpenetrating polymer networks based on polyacrylamide and poly[itaconic acid]

2003 ◽  
Vol 57 (11) ◽  
pp. 543-546 ◽  
Author(s):  
Melina Kalagasidis-Krusic ◽  
Biljana Nikolic ◽  
Jovanka Filipovic
Keyword(s):  
Itaconic Acid ◽  
Polymer Network ◽  
Polymer Networks ◽  
Low Ph ◽  
Interpenetrating Polymer Networks ◽  
Polyacrylamide Gel ◽  
Swelling Properties ◽  
Swelling Degree ◽  
Equilibrium Swelling ◽  
Carboxylic Groups

The effect of pH and temperature on the equilibrium swelling properties of PIA/PAAm semi-IPNs were investigated.Semi-IPNs based on polyacrylamide (PAAm) and poly(itaconic acid) (PIA) were prepared by two different techniques, by polymerizing itaconic acid in the presence of polyacrylamide gel (Semi-IPNs-l) and by making the polyacrylamide gel in the presence of previously synthesized poly(itaconic acid) (Semi-IPNs-ll), with different PIA/PAAm mass ratios. The equilibrium swelling degree of an ionic network depends very much on the concentration of ionisable groups. The addition of a small amount of itaconic acid dramatically changes the swelling behavior of PAAm. Increase of the ionic monomer (IA) produces swelling degrees that increase to a high extent when the pH of the buffer solution is higher than the nominal pKa values of the acid groups. Gels with higher IA content swell less than PAAm gels in low pH buffers. At low pH, when complexation due to hydrogen bonding occurs between the carboxylic groups and amide groups of acrylamide, the polymer network collapses and the swelling ratio is low. The presence of hydrogen bonds in the complexes causes additional constraints in the network, acting as a physical crosslinking and makes the network less hydrophilic, because the carboxylic groups on the PIA are occupied in the complexes. As opposed to this, the equilibrium swelling degrees change very little with pH of the solution in nonionic PAAm gel.Hydrogels exhibit continuous changes in water content as a function of temperature. The swelling degree increases with increasing temperature due to gel expansion upon warming.

scholarly journals Equilibrium swelling properties of polyampholytic hydrogels

1996 ◽  
Vol 104 (21) ◽  
pp. 8713-8720 ◽  
Author(s):  
Anthony E. English ◽  
Salvador Mafé ◽  
José A. Manzanares ◽  
Xiahong Yu ◽  
Alexander Yu. Grosberg ◽  
...  
Keyword(s):  
Swelling Properties ◽  
Equilibrium Swelling

Investigation of NBR-cellulose II nanocomposites by rheometric and equilibrium swelling properties

2007 ◽  
Vol 60 (2-3) ◽  
pp. 281-290 ◽  
Author(s):  
Vera Lúcia da C. Lapa ◽  
Patrícia D. de Oliveira ◽  
Leila Léa Y. Visconte ◽  
Regina Celia R. Nunes
Keyword(s):  
Cellulose Ii ◽  
Swelling Properties ◽  
Equilibrium Swelling
Sign in / Sign up

Export Citation Format

Share Document