Modeling of the linear viscoelastic behavior of low-density polyethylene

2005 ◽  
Vol 43 (15) ◽  
pp. 1973-1985 ◽  
Author(s):  
P. Stanescu ◽  
J. C. Majesté ◽  
C. Carrot
Keyword(s):  
Viscoelastic Behavior ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic

Measurement of the loss tangent of low-density polyethylene with a nanoindentation technique

2000 ◽  
Vol 15 (5) ◽  
pp. 1195-1198 ◽  
Author(s):  
J. L. Loubet ◽  
W. C. Oliver ◽  
B. N. Lucas
Keyword(s):  
Loss Tangent ◽  
Arrhenius Equation ◽  
Viscoelastic Behavior ◽  
Low Density ◽  
Diamond Indenter ◽  
Different Temperatures ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Two Temperatures ◽  
Good Agreement

This paper describes experimental measurements of the linear viscoelastic behavior of the surface of low-density (LD) polyethylene in contact with a pyramidal Berkovich diamond indenter. The experiments were carried out at two different temperatures, 15.9 and 27.2 °C, between frequencies of 0.1 and 800 Hz. Using the shift of the loss tangent between the two temperatures at frequencies lower than 20 Hz and an Arrhenius equation, an activation energy of 105 ± 2 kJ/mol was obtained. This value is in good agreement with the bulk value of the a relaxation of LD polyethylene reported in the literature.

Bionanocomposites with enhanced antimicrobial activity and photodegradability based on low density polyethylene and nano TiO2/organoclay

e-Polymers ◽  
2014 ◽  
Vol 14 (1) ◽  
pp. 43-55 ◽  
Author(s):  
Pouya Katbab ◽  
Maryam Alizadeh ◽  
Babak Kaffashi ◽  
Ali Asghar Katbab
Keyword(s):  
Electron Microscopy ◽  
Uv Light ◽  
Viscoelastic Behavior ◽  
Barrier Properties ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Mechanical Spectroscopy ◽  
Melt Compounding ◽  
Linear Viscoelastic Behavior ◽  
Nano Titanium Dioxide

AbstractBionanocomposite materials with enhanced photodegradability and bactericidal activity, as well as improved gas barrier properties, were manufactured by incorporating silicate nanolayers into the structure of low density polyethylene (LDPE) filled with nano titanium dioxide (TiO2) via melt compounding. Effects of interfacial compatibilization upon developed microstructure were studied by incorporating maleated LDPE into the nanocomposites formulation. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and rheo-mechanical spectroscopy (RMS) techniques were conducted to characterize the microstructure of the nanocomposites. Interfacially compatibilized TiO2/organoclay (OC) based nanocomposites exhibited shorter induction time for the onset of photodegradation, and an acceptable inactivation of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) microbe cells upon UV light irradiation, indicating enhanced photoactivity of the hybridized TiO2/OC nanosystem. TiO2/OC-based nanocomposites exhibited increased melt viscosity and pseudo solid like characteristics in melt linear viscoelastic behavior. Moreover, TiO2/OC-based nanocomposites presented improved barrier properties, which make such materials applicable for packaging applications.

Combined Statistical-Mechanical Characterization of a Next Generation Textured PTFE for Extreme Environments

2018 ◽  
Author(s):  
Sannmit Shinde ◽  
Ali P. Gordon ◽  
Zachary Poust ◽  
Steve Pitolaj ◽  
Jim Drago ◽  
...  
Keyword(s):  
Extreme Environments ◽  
Viscoelastic Behavior ◽  
Ceramic Particle ◽  
Operating Conditions ◽  
Operating Environments ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Statistical Mechanical ◽  
Relaxation Responses

Pressurized vessels that transfer media from one location to another often contain a bolted connection. Gaskets are essential for these systems since they confer high levels of leak mitigation across of range of operating environments (i.e., internal pressure and temperature). The balance of both sealability and compressibility must be displayed in candidate gasket materials to be subjected to aggressive operating conditions. Historically, thin gauge gasket (i.e., 1/16” thick) confer high sealability while thick gaskets offer superior compressibility (i.e., 1/8”). Fabricated with skive cut, ceramic particle-reinforced PTFE, these materials display linear viscoelastic behavior that allow consolidation to occur. For example, GYLON® 3504 is filled with Aluminosilicate Microspheres, GYLON®3510 is filled with barium sulfate, respectively, to efficiently fill crevices along the surfaces of the flange. Novel textured PTFE gasket (3504 EPX and 3510 EPX) have been developed to simultaneously confer sealability and compressibility compared to flat products. A design of experiments (DoE) approach is applied to characterize the factors that influence load relaxation responses of the both candidate textured PTFE (dual-face honeycomb) and existing (flat) gasket styles. Using an instrumented test platform analyzed. A new parameter is presented to quantify gasket efficiency. The collection of efficiency measurement methods and approach to re-torque optimization convey a novel framework that designers can invoke to facilitate improved flange performance.

Linear Viscoelastic Behavior of Symmetric and Asymmetric Star Polymer Solutions

2006 ◽  
Vol 39 (19) ◽  
pp. 6677-6685 ◽  
Author(s):  
Jung Hun Lee ◽  
Justin M. Goldberg ◽  
Lewis J. Fetters ◽  
Lynden A. Archer
Keyword(s):  
Polymer Solutions ◽  
Viscoelastic Behavior ◽  
Star Polymer ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic

Effect of the chemical structure on the linear viscoelastic behavior of acrylic and styrenic polymer blends

2018 ◽  
Vol 67 ◽  
pp. 257-265 ◽  
Author(s):  
Juciklécia S. Reinaldo ◽  
Laurenice Martins Pereira ◽  
Erik dos Santos Silva ◽  
Marcelo M. Ueki ◽  
Edson N. Ito
Keyword(s):  
Polymer Blends ◽  
Chemical Structure ◽  
Viscoelastic Behavior ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Styrenic Polymer
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