Influence of Carbon Nanotube Aspect Ratio on Normal Stress Differences in Isotactic Polypropylene Nanocomposite Melts

2008 ◽  
Vol 41 (3) ◽  
pp. 815-825 ◽  
Author(s):  
Dong-Hua Xu ◽  
Zhi-Gang Wang ◽  
Jack F. Douglas
Keyword(s):  
Carbon Nanotube ◽  
Aspect Ratio ◽  
Normal Stress ◽  
Isotactic Polypropylene ◽  
Normal Stress Differences

Flow-induced structure and rheological properties of multiwall carbon nanotube/polydimethylsiloxane composites

RSC Advances ◽  
2014 ◽  
Vol 4 (107) ◽  
pp. 62759-62768 ◽  
Author(s):  
Ran Niu ◽  
Jiang Gong ◽  
Donghua Xu ◽  
Tao Tang ◽  
Zhao-Yan Sun
Keyword(s):  
Molecular Weight ◽  
Carbon Nanotube ◽  
Rheological Properties ◽  
Normal Stress ◽  
Polymer Composites ◽  
Polymer Matrix ◽  
Multiwall Carbon Nanotube ◽  
Normal Stress Differences ◽  
Induced Structure ◽  
Multiwall Carbon

The structure and normal stress differences of MWNT/polymer composites are influenced by the molecular weight of the polymer matrix and the confinement effect.

Investigation of stresses and normal stress differences behavior on symmetric and asymmetric polymeric fluid flow through planar gradual expansions

Meccanica ◽  
2016 ◽  
Vol 52 (8) ◽  
pp. 1889-1909 ◽  
Author(s):  
M. Norouzi ◽  
A. Shahbani Zahiri ◽  
M. M. Shahmardan ◽  
H. Hassanzadeh ◽  
M. Davoodi
Keyword(s):  
Fluid Flow ◽  
Normal Stress ◽  
Polymeric Fluid ◽  
Flow Through ◽  
Normal Stress Differences

Method of normal stress differences in photoelasticity

1982 ◽  
Vol 18 (8) ◽  
pp. 763-766
Author(s):  
Yu. I. Vologzhaninov ◽  
S. G. Demidenko ◽  
A. V. Churpita
Keyword(s):  
Normal Stress ◽  
Normal Stress Differences

Influence of Carbon Nanotube Aspect Ratio on Glass Transition Temperature of Polymers: A Molecular Dynamics Simulation Study

2015 ◽  
Vol 817 ◽  
pp. 797-802 ◽  
Author(s):  
Cai Jiang ◽  
Jian Wei Zhang ◽  
Shao Feng Lin ◽  
Su Ju ◽  
Da Zhi Jiang
Keyword(s):  
Molecular Dynamics ◽  
Glass Transition ◽  
Carbon Nanotube ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Aspect Ratio ◽  
Epoxy Resin ◽  
Md Simulations ◽  
Diglycidyl Ether ◽  
Dynamics Simulation

Molecular dynamics (MD) simulations on three single walled carbon nanotube (SWCNT) reinforced epoxy resin composites were conducted to study the influence of SWCNT type on the glass transition temperature (Tg) of the composites. The composite matrix is cross-linked epoxy resin based on the epoxy monomers bisphenol A diglycidyl ether (DGEBA) cured by diaminodiphenylmethane (DDM). MD simulations of NPT (constant number of particles, constant pressure and constant temperature) dynamics were carried out to obtain density as a function of temperature for each composite system. The Tg was determined as the temperature corresponding to the discontinuity of plot slopes of the densityvsthe temperature. In order to understand the motion of polymer chain segments above and below the Tg, various energy components and the MSD at various temperatures of the composites were investigated and their roles played in the glass transition process were analyzed. The results show that the Tg of the composites increases with increasing aspect ratio of the embedded SWCNT

Measuring and assessing first and second normal stress differences of polymeric fluids with a modular cone-partitioned plate geometry

2018 ◽  
Vol 57 (5) ◽  
pp. 363-376 ◽  
Author(s):  
Salvatore Costanzo ◽  
Giovanni Ianniruberto ◽  
Giuseppe Marrucci ◽  
Dimitris Vlassopoulos
Keyword(s):  
Normal Stress ◽  
Polymeric Fluids ◽  
Normal Stress Differences ◽  
Plate Geometry

Viscoelastic Effects in Multilayer Polymer Extrusion

2006 ◽  
Vol 16 (4) ◽  
pp. 198-205 ◽  
Author(s):  
Patrick D. Anderson ◽  
Joseph Dooley ◽  
Han E.H. Meijer
Keyword(s):  
Design Optimization ◽  
Normal Stress ◽  
Mapping Method ◽  
Computational Method ◽  
Die Design ◽  
Polymer Extrusion ◽  
Viscoelastic Effects ◽  
Normal Stress Differences

Abstract The effect of viscoelasticity on multilayer polymer extrusion is discussed. In these coextrusion processes predetermined patterns are created with a remarkable breadth of complexity even in geometrically simple dies via elastic rearrangements caused by the second-normal stress differences. A computational method is offered, based on the mapping method, which quantitatively describes the flow-induced patterns. Besides that the results are esthetically beautiful, they are also relevant for practice, since process and die design optimization is now possible. Not only to minimize interface distortion, but potentially also to deliberately create new processes and products based on this flow-induced patterning of polymers.

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