Characterization of network structure by branching theory and correlation with viscoelastic properties

2007 ◽  
pp. 26-34 ◽  
Author(s):  
K. Dušek ◽  
M. Ilavský
Keyword(s):  
Network Structure ◽  
Viscoelastic Properties

Characterization of Ultrafine Glassy Powder for Al-Si-Ca-P-O-F Polynary System by Liquid Precipitation

2010 ◽  
Vol 177 ◽  
pp. 433-436 ◽  
Author(s):  
G.C. Yuan ◽  
Q.G. Wu ◽  
Guo Xun Zeng ◽  
Z.Y. Ling
Keyword(s):  
Heat Treatment ◽  
Network Structure ◽  
Inorganic Compounds ◽  
Amorphous State ◽  
Precipitation Method ◽  
Hollow Particles ◽  
Heat Treated ◽  
Quenched Glass ◽  
Liquid Precipitation

The ultrafine glassy powder of Al-Si-Ca-P-O-F polynary system was prepared by liquid precipitation method with several inorganic compounds as reactants containing the ions such as Al3+, SiO32-, P3O105-, Ca2+, F-, respectively. The powder was heat-treated in the range of temperature from 773 to 1173K and its crystallized processes were ascertained. The morphology, composition, bonding state and structure, crystallized behavior of the glassy powder were characterized by means of TEM, XRD, EDAX, IR, DSC etc methods. The results show that the powder containing Al, Si, Ca, P, O, F elements belongs to typical amorphous state, and the particles appeared hollow and near spherical morphology with the size from 30 to 70nm. The hollow particles collapsed as plate like conglutination state and a series of crystallized phases CaF2, Al2SiO5, Ca2SiO4, and Ca3(PO4)2 were separated sequentially during heat treatment in the range of temperature above. The characteristics of the glassy powder are similar to those of popular melting-quenched glass of the system. The network structure of the glass was mainly formed by the tetrahedrons of [SiO4], [AlO4] and [PO4], which were linked by the oxygen atoms of the angle in the tetrahedrons.

Characterization of networks from photoreactive copolymers: an attempt to correlate chemical composition to network structure

2010 ◽  
Vol 59 (12) ◽  
pp. 1563-1570 ◽  
Author(s):  
Branislav Husár ◽  
Sophie Commereuc ◽  
Štefan Chmela ◽  
Vincent Verney
Keyword(s):  
Chemical Composition ◽  
Network Structure

Characterization of viscoelastic properties of polymeric materials through nanoindentation

2005 ◽  
Vol 45 (2) ◽  
pp. 130-136 ◽  
Author(s):  
G. M. Odegard ◽  
T. S. Gates ◽  
H. M. Herring
Keyword(s):  
Viscoelastic Properties ◽  
Polymeric Materials

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 .

scholarly journals Multiple Activities in Networks

2018 ◽  
Vol 10 (3) ◽  
pp. 34-85 ◽  
Author(s):  
Ying-Ju Chen ◽  
Yves Zenou, ◽  
Junjie Zhou
Keyword(s):  
Nash Equilibrium ◽  
Network Model ◽  
Network Structure ◽  
Comparative Statics ◽  
Network Density ◽  
Full Characterization ◽  
The One

We consider a network model where individuals exert efforts in two types of activities that are interdependent. These activities can be either substitutes or complements. We provide a full characterization of the Nash equilibrium of this game for any network structure. We show, in particular, that quadratic games with linear best-reply functions aggregate nicely to multiple activities because equilibrium efforts obey similar formulas to that of the one-activity case. We then derive some comparative-statics results showing how own productivity affects equilibrium efforts and how network density impacts equilibrium outcomes. (JEL C72, D11, D85, Z13)

Nonlinear viscoelastic characterization of charged cellulose nanocrystal network structure in the presence of salt in aqueous media

Cellulose ◽  
2020 ◽  
Vol 27 (10) ◽  
pp. 5729-5743 ◽  
Author(s):  
Aref Abbasi Moud ◽  
Milad Kamkar ◽  
Amir Sanati-Nezhad ◽  
Seyed Hossein Hejazi ◽  
Uttandaraman Sundararaj
Keyword(s):  
Network Structure ◽  
Aqueous Media ◽  
Cellulose Nanocrystal ◽  
Nonlinear Viscoelastic
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