scholarly journals A method to extract the monomer friction coefficient from the linear viscoelastic behavior of linear, entangled polymer melts

2004 ◽  
Vol 43 (6) ◽  
pp. 615-623 ◽  
Author(s):  
Jan van Meerveld
Keyword(s):  
Friction Coefficient ◽  
Polymer Melts ◽  
Viscoelastic Behavior ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Entangled Polymer ◽  
Entangled Polymer Melts

A Comparison of Tube Model Predictions of the Linear Viscoelastic Behavior of Symmetric Star Polymer Melts

2014 ◽  
Vol 47 (10) ◽  
pp. 3350-3361 ◽  
Author(s):  
Volha Shchetnikava ◽  
Johan J. M. Slot ◽  
Evelyne van Ruymbeke
Keyword(s):  
Polymer Melts ◽  
Viscoelastic Behavior ◽  
Star Polymer ◽  
Tube Model ◽  
Model Predictions ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Symmetric Star

Non-linear viscoelastic behavior of polymer melts interpreted by fractional viscoelastic model

Meccanica ◽  
2016 ◽  
Vol 52 (8) ◽  
pp. 1843-1850 ◽  
Author(s):  
Salvatore Di Lorenzo ◽  
Mario Di Paola ◽  
Francesco Paolo La Mantia ◽  
Antonina Pirrotta
Keyword(s):  
Polymer Melts ◽  
Viscoelastic Model ◽  
Viscoelastic Behavior ◽  
Non Linear ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic

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.

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