Electrodes with polymer network films formed by .gamma.-irradiation cross-linking

1987 ◽  
Vol 59 (1) ◽  
pp. 134-139 ◽  
Author(s):  
Emory S. De Castro ◽  
Edward W. Huber ◽  
Denis. Villarroel ◽  
Christos. Galiatsatos ◽  
James E. Mark ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Polymer Network ◽  
Cross Linking

scholarly journals Computational Method for Simulating Thermoset Polymer Curing and Prediction of Thermophysical Properties

2020 ◽  
Author(s):  
Jeffrey Sanders ◽  
Carla E. Estridge ◽  
Matthew B Jackson ◽  
Thomas JL Mustard ◽  
Samuel J. Tucker ◽  
...  
Keyword(s):  
High Throughput ◽  
Thermophysical Properties ◽  
High Throughput Screening ◽  
Simulation Analysis ◽  
Low Cost ◽  
Polymer Network ◽  
Thermomechanical Properties ◽  
Computational Method ◽  
Cross Linking ◽  
Automated Simulation

Thermoset polymers are an area of intense research due to their low cost, ease of processing, environmental resistance, and unique physical properties. The favorable properties of this class of polymers have many applications in aerospace, automotive, marine, and sports equipment industries. Molecular simulations of thermosets are frequently used to model formation of the polymer network, and to predict the thermomechanical properties. These simulations usually require custom algorithms that are not easily accessible to non-experts and not suited for high throughput screening. To address these issues, we have developed a robust cross-linking algorithm that can incorporate different types of chemistries and leverage GPU-enabled molecular dynamics simulations. Automated simulation analysis tools for cross-linking simulations are also presented. Using four well known epoxy/amine formulations as a foundational case study and benzoxazine as an example of how additional chemistries can be modeled, we demonstrate the power of the algorithm to accurately predict curing and thermophysical properties. These tools are able to streamline the thermoset simulation process, opening up avenues to in-silico high throughput screening for advanced material development.

scholarly journals Hydrogel-Silver Nanoparticle Composites for Biomedical Applications

2020 ◽  
Vol 65 (5) ◽  
pp. 446
Author(s):  
O. Nadtoka ◽  
N. Kutsevol ◽  
T. Bezugla ◽  
P. Virych ◽  
A. Naumenko
Keyword(s):  
Silver Nanoparticle ◽  
Biomedical Applications ◽  
Polymer Network ◽  
Cross Linking ◽  
Polyacrylamide Hydrogels ◽  
Photochemical Generation ◽  
Vis Spectroscopy ◽  
Swelling Capacity ◽  
Swelling Studies ◽  
Nanoparticle Composites

Polyacrylamide and dextran-graft-polyacrylamide hydrogels are prepared and used as nanoreactors and networks for the synthesis of silver nanoparticles (AgNPs). Photochemical generation of AgNPs is carried out under UV-irradiation of Ag+ ions in swollen hydrogels of different cross-linking densities. The obtained hydrogels and hydrogel/AgNPs composites are characterized by TEM, FTIR, and UV–Vis spectroscopy. Swelling studies have shown a relationship between the structure of the hydrogels and their ability to swell. It is shown that the presence of AgNPs in the polymer network leads to a decrease of the swelling capacity. An increase in the cross-linking density leads to an expansion of the AgNPs size distribution for both types of hydrogels. All synthesized hydrogel-silver nanoparticle composites have shown a high activity in the growth retardation of Staphylococcus aureus microorganisms.

Synthesis and characterization of a novel wound dressing by PVP/ PAANa/chitosan with semi-interpenetrating polymer network structure

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Ying Wu ◽  
Qing Yang ◽  
Yali Gi ◽  
Yueting Zhang
Keyword(s):  
Network Structure ◽  
Wound Dressing ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Wound Dressings ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Mass Ratio ◽  
Scanning Electron

AbstractA novel hydrogel wound dressing with semi-interpenetrating polymer network structure (semi-IPN) was prepared by radical polymerization of acrylic acid with potassium persulfate (K2S2O8) as initiator and N, N'-methylenebisacrylamide (MBA) as cross-linking agent in the presence of chitosan (CTS) and polyvinyl pyrrolidone (PVP). Hydrogels were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). SEM displayed semi- IPN hydrogels' creased surface with some scale-like wrinkles, thus improving the absorptive capability which has been considered as a most important characteristic of wound dressings. It was found that the content of cross-linking agent and the mass ratio of PVP and CTS had much influence on the mechanical properties of the hydrogel, varying from brittle plastics to elastomer due to the different degrees of cross linking. Since tensile strength is partly in inverse ratio to the hydrogel absorbent capability, the article offers an analysis of varying material proportion in order to obtain an optimum properties of the hydrogel wound dressing .

Post-gamma irradiation cross-linking of polyethylene tape by acetylene treatment

1994 ◽  
Vol 29 (1) ◽  
pp. 227-231 ◽  
Author(s):  
R. W. Appleby ◽  
W. K. Busfield
Keyword(s):  
Gamma Irradiation ◽  
Cross Linking

Observation of Glass Transition Temperatures in Polymeric Thin Films by Wafer Curvature Measurements

1991 ◽  
Vol 239 ◽  
Author(s):  
P. H. Townsend ◽  
B. S. Huber ◽  
D. S. Wang
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Polymer Network ◽  
Cross Linking ◽  
Positional Isomers ◽  
Glass Transition Temperatures ◽  
Thin Coatings ◽  
Polymeric Thin Films ◽  
Curvature Measurements

ABSTRACTWafer bending measurements have been used to study the glass transition temperature, Tg, of thin coatings of polystyrene and polycarbonate on Si wafers. The observed values of Tg agree with DSC and TMA measurements on bulk samples. The evolution of the substrate curvature has been used to examine the behavior of Tg in thin epoxy films and coatings derived from divinylsiloxane bisbenzocyclobutene, mixed stereo and positional isomers of 1, 3-bis(2-bicyclo[4.2.0]octa-1, 3, 5-trien-3-ylethenyl)-1, 1, 3, 3-tetramethyl disitoxane (CAS 117732–87–3). The dependence of the Tg of the epoxide coatings is studied as a function of the cross-linking. The evolution of the Tg in the benzocyclobutene coating is found to be a monotonie function of the level of conversion of the polymer network.

scholarly journals Interpenetrating Polymer Network Hydrogels Based on Gelatin and PVA by Biocompatible Approaches: Synthesis and Characterization

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Eltjani-Eltahir Hago ◽  
Xinsong Li
Keyword(s):  
Mechanical Properties ◽  
Mtt Assay ◽  
Biomedical Applications ◽  
Polymer Network ◽  
Physical And Mechanical Properties ◽  
Morphological Characterization ◽  
Interpenetrating Polymer Network ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
New Approach

In this work, a new approach was introduced to prepare interpenetrating polymer network PVA/GE hydrogels by cross-linking of various concentration gelatin in the presence of transglutaminase enzyme by using the freezing-thawing cycles technique. The effects of freezing-thawing cycles on the properties of morphological characterization, gel fraction, swelling, mechanical, and MTT assay were investigated. The IPN PVA/GE hydrogels showed excellent physical and mechanical Properties. MTT assay data and the fibroblasts culture also showed excellent biocompatibility and good proliferation. This indicates that the IPN hydrogels are stable enough for various biomedical applications.

Novel way to control PDMS cross-linking by gamma-irradiation

2008 ◽  
Vol 266 (7) ◽  
pp. 1105-1108 ◽  
Author(s):  
S.R. Gomes ◽  
F.M.A. Margaça ◽  
D. Faria Silva ◽  
L.M. Ferreira ◽  
I.M. Miranda Salvado ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Cross Linking

New Low Toxic Water-Soluble Monomers for Gelcasting of Ceramic Powders

2010 ◽  
Vol 62 ◽  
pp. 163-168 ◽  
Author(s):  
Mikolaj Szafran ◽  
Agnieszka Szudarska ◽  
Paulina Bednarek
Keyword(s):  
In Situ Polymerization ◽  
Polymer Network ◽  
Water Soluble ◽  
Cross Linking ◽  
Alumina Powder ◽  
Hydroxyl Groups ◽  
Ceramic Powders ◽  
Ceramic Slurry ◽  
Low Toxic

In this paper the two new low toxic water-soluble monomers: glycerol monoacrylate and 3-O-acrylic-D-glucose are introduced and their application in gelcasting of alumina powder is reported, in comparison with 2-hydroxyethyl acrylate, the commercial monomer. Both synthesized substances do not need an addition of cross-linking agent to the ceramic slurry, because hydrogen bonds can be formed in the polymer network, owing to the presence of two or more hydroxyl groups in their molecules, unlike in the case of 2-hydroxyethyl acrylate. Rheological behavior of alumina gelcasting suspensions containing these monomers has been studied, as well as the characteristics of raw and sintered elements formed from these slurries by initializing an in situ polymerization.

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