scholarly journals Nanoparticle Interactions and Molecular Relaxation in PLA/PBAT/Nanoclay Blends

2020 ◽  
Vol 1 ◽  
Author(s):  
M. Nofar ◽  
M.-C. Heuzey ◽  
P.J. Carreau ◽  
M.R. Kamal
Keyword(s):  
Small Amplitude ◽  
Relaxation Behavior ◽  
Molecular Relaxation ◽  
Stress Growth ◽  
Small Amplitude Oscillatory Shear ◽  
Clay Nanoparticles ◽  
Modified Clay ◽  
Nanoparticle Interactions ◽  
Before And After ◽  
Spectra Properties

AbstractOrgano-modified clay nanoparticles were mixed at 1 and 5 wt% concentrations with a molten blend of 75 wt% of polylactide (PLA) and 25 wt% poly[(butylene adipate)-co-terephthalate] (PBAT). Three mixing strategies were used to control the localization of nanoclay. Small amplitude oscillatory shear (SAOS) and stress growth tests were conducted to clarify the nanoclay interactions with the blend components and its effect on the molecular relaxation behavior. SAOS and weighted relaxation spectra properties were determined before and after pre-shearing at a rate of 0.01 s−1. Molecular relaxation and its characteristics were influenced by PLA degradation, PBAT droplet coalescence, and nanoclay localization.

Preparing and characterization of Poly(glycerol-sebacic acid-urethane) (PGSU) nanocomposites: clearing role of unmodified and modified clay nanoparticles

2021 ◽  
Vol 29 (1) ◽  
Author(s):  
Mohammad Monem ◽  
Zahed Ahmadi ◽  
Vafa Fakhri ◽  
Vahabodin Goodarzi
Keyword(s):  
Sebacic Acid ◽  
Clay Nanoparticles ◽  
Modified Clay

Numerical simulations of small amplitude oscillatory shear flow of suspensions of rigid particles in non-Newtonian liquids at finite inertia

2021 ◽  
Vol 65 (5) ◽  
pp. 821-835
Author(s):  
Massimiliano M. Villone ◽  
Marco E. Rosti ◽  
Outi Tammisola ◽  
Luca Brandt
Keyword(s):  
Shear Flow ◽  
Numerical Simulations ◽  
Small Amplitude ◽  
Oscillatory Shear ◽  
Small Amplitude Oscillatory Shear ◽  
Rigid Particles ◽  
Oscillatory Shear Flow ◽  
Newtonian Liquids

Effects of Flow Properties of Lithium Soap Greases on Bearing Torque

2019 ◽  
Vol 823 ◽  
pp. 123-127
Author(s):  
Norifumi Miyanaga ◽  
Mitsumi Nihei ◽  
Jun Tomioka
Keyword(s):  
Apparent Viscosity ◽  
Small Amplitude ◽  
Shear Stresses ◽  
Flow Properties ◽  
Small Amplitude Oscillatory Shear ◽  
Small Ball ◽  
Shear Rates ◽  
Lithium Soap ◽  
Viscoelastic Behaviors ◽  
Plate Type

This study describes the influence of flow properties of lithium soap greases on torque of small ball bearings. Three types of greases with different worked penetration were tested in this study. Their rheological properties are revealed by a cone plate type rheometer. Shear stresses under various shear rates are fitted with the Herschel-Bulkley equation. In addition, viscoelastic behaviors of the greases are measured by small amplitude oscillatory shear. The crossover stress that means the shear stress at G’=G” is obtained for the greases. Then, the bearing torque when three types of greases are used as a lubricant is measured. As the results, the grease with higher crossover stress shows the lower bearing torque regardless of that it has larger apparent viscosity. On the other hand, the grease with lower crossover stress shows the higher bearing torque regardless of that it has lower apparent viscosity. These results imply that the channeling state appears in the grease with higher crossover stress while the churning state appears in the grease with lower crossover stress.

Effects of molecular relaxation behavior on sized carbon fiber–vinyl ester matrix composite properties

Polymer ◽  
2001 ◽  
Vol 42 (4) ◽  
pp. 1633-1645 ◽  
Author(s):  
K.N E Verghese ◽  
R.E Jensen ◽  
J.J Lesko ◽  
T.C Ward
Keyword(s):  
Carbon Fiber ◽  
Matrix Composite ◽  
Vinyl Ester ◽  
Relaxation Behavior ◽  
Molecular Relaxation ◽  
Composite Properties

Small amplitude oscillatory shear technique to evaluate structural build-up of cement paste

2016 ◽  
Vol 50 (2) ◽  
Author(s):  
Qiang Yuan ◽  
Xin Lu ◽  
Kamal H. Khayat ◽  
Dimitri Feys ◽  
Caijun Shi
Keyword(s):  
Cement Paste ◽  
Small Amplitude ◽  
Oscillatory Shear ◽  
Small Amplitude Oscillatory Shear

scholarly journals Phase behavior actuating morphology and rheological response of polybutadiene/polyisoprene blends under small amplitude oscillatory shear

2014 ◽  
Vol 32 (6) ◽  
pp. 718-730 ◽  
Author(s):  
Fa-sheng Zou ◽  
Xia Dong ◽  
Wei Liu ◽  
Du-jin Wang ◽  
Charles C. Han
Keyword(s):  
Phase Behavior ◽  
Small Amplitude ◽  
Oscillatory Shear ◽  
Small Amplitude Oscillatory Shear ◽  
Rheological Response

scholarly journals Effect of Shear Flow on Crystallization of Sydiotactic Polypropylene/Clay Composites

2018 ◽  
Vol 8 (4) ◽  
pp. 3108-3112
Author(s):  
N. Ahmad ◽  
E. Fouad ◽  
F. Ahmad
Keyword(s):  
Shear Flow ◽  
Small Amplitude ◽  
Crystallization Rate ◽  
High Sensitivity ◽  
Syndiotactic Polypropylene ◽  
Small Amplitude Oscillatory Shear ◽  
Expansion System ◽  
Induced Crystallization ◽  
Composite Samples ◽  
Flow Induced Crystallization

The high sensitivity of crystallization to shear flow is a subject of great research interest the last several years. A set of syndiotactic polypropylene/clay composite samples were used to examine the effect of shear flow on crystallization kinetics. This phenomenon alters both processing and material final properties. In the present work, the effects of clay contents and shear flow on the rate of flow induced crystallization were investigated using rheological technique. Small amplitude oscillatory shear experiments were performed using advanced rheometric expansion system (ARES). The crystallization rate is found to alter by both shear and clay contents in the polymer composites.

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