Development of waste tire‐derived graphene reinforced polypropylene nanocomposites with controlled polymer grade, crystallization and mechanical characteristics via melt‐mixing

2020 ◽  
Vol 69 (9) ◽  
pp. 771-779
Author(s):  
Jamal Seyyed Monfared Zanjani ◽  
Leila Haghighi Poudeh ◽  
Burcu Girginer Ozunlu ◽  
Yavuz Emre Yagci ◽  
Yusuf Menceloglu ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Melt Mixing ◽  
Waste Tire ◽  
Polypropylene Nanocomposites

Dielectric and Thermomechanical Properties of Polypropylene/Multi-Walled Carbon Nanotubes Nanocomposites

2007 ◽  
Vol 1056 ◽  
Author(s):  
A. Kanapitsas ◽  
E. Logakis ◽  
C. Pandis ◽  
I. Zuburtikudis ◽  
P. Pissis ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Percolation Threshold ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Dielectric Relaxation Spectroscopy ◽  
Melt Mixing ◽  
Polypropylene Nanocomposites ◽  
Multi Walled Carbon Nanotubes ◽  
Permittivity Measurements ◽  
Walled Carbon Nanotubes

ABSTRACTThe purpose of this work is to examine the dielectric, electrical and thermo-mechanical properties of multi-walled carbon nanotubes (MWCNT) filled polypropylene nanocomposites formed by melt-mixing. To that aim dielectric relaxation spectroscopy (DRS) and dymamic mechanical analysis (DTMA) were employed. The results are discussed in terms of nucleating action of MWCNT and interfacial polymer-filler interactions. Special attention is paid to percolation aspects by both ac conductivity measurements for the samples which are above the percolation threshold and permittivity measurements for the samples which are below percolation threshold.

Tensile Properties of Clay/Polypropylene Nanocomposites at Cryogenic Temperature

2012 ◽  
Vol 488-489 ◽  
pp. 562-566
Author(s):  
S. Mohammad Reza Khalili ◽  
Neda Soleimani ◽  
Reza Eslami Farsani ◽  
Ziba Hedayatnasab
Keyword(s):  
Tensile Strength ◽  
Maleic Anhydride ◽  
Tensile Properties ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Melt Mixing ◽  
Clay Particles ◽  
Polypropylene Nanocomposites ◽  
Pp Composites ◽  
Compatibilizing Agent

In this paper, the polypropylene (PP)nanocomposites containing 1, 3 and 5 wt % of nanoclay particles are prepared via direct melt mixing in the presence of maleic anhydride grafted PP (PP-g-MA) as compatibilizing agent. PP-g-MA is known to facilitate the dispersion of clay particles in a nonpolar PP matrix and to increase the adhesion between PP and the clay particles.The effect of different nanoclay contents on the PP composites are investigated for tensile characterization at both room temperature(RT) and cryogenic temperature (CT).The results showed that the cryogenic tensile strength, Young’s modulus, percentage of displacement at break and the energy absorptionat cryogenic temperature are all enhanced ascompared to the neat PP by the addition of clay at appropriate contents

Mechanical, thermal, and rheological properties of graphene-based polypropylene nanocomposites prepared by melt mixing

2012 ◽  
Vol 33 (5) ◽  
pp. 733-744 ◽  
Author(s):  
Mounir El Achaby ◽  
Fatima-Ezzahra Arrakhiz ◽  
Sébastien Vaudreuil ◽  
Abou el Kacem Qaiss ◽  
Mostapha Bousmina ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Melt Mixing ◽  
Polypropylene Nanocomposites

Spherulitic Morphology and Thermal Stability of PP/ZnO Nanocomposites

2003 ◽  
Vol 788 ◽  
Author(s):  
Sandeep Razdan ◽  
Prabir Patra ◽  
Yong Kim ◽  
Steve Warner
Keyword(s):  
Thermal Stability ◽  
Zinc Oxide ◽  
Decomposition Temperature ◽  
Mixing Process ◽  
Melt Mixing ◽  
Temperature Decomposition ◽  
Polypropylene Nanocomposites ◽  
Induced Changes ◽  
Thermal Stability Of ◽  
Control Samples

ABSTRACTPolypropylene nanocomposites were prepared using zinc oxide as the filler by melt mixing process. Nanocomposites were also prepared using maleic anhydride grafted polypropylene and methylated-zinc oxide using the same method. The samples were analyzed for observing changes in morphology and thermal stability using various characterizing instruments. The results showed that zinc oxide induced changes in the morphology and thermal stability of polypropylene, though by varying amounts depending on the type of nanocomposite prepared. The nanocomposites prepared from g-PP and methylated zinc oxide showed significant changes in crystallization temperature, decomposition temperature and residue formed upon decomposition, as compared to the rest of the composites or control samples. This was attributed to higher degree of interaction existing at the interphase between the organic and inorganic phases for these nanocomposites.

scholarly journals Experimental and Numerical Investigation of Flow and Alignment Behavior of Waste Tire-Derived Graphene Nanoplatelets in PA66 Matrix during Melt-Mixing and Injection

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 949
Author(s):  
Kuray Dericiler ◽  
Hadi Mohammadjafari Sadeghi ◽  
Yavuz Emre Yagci ◽  
Hatice S. Sas ◽  
Burcu Saner Okan
Keyword(s):  
Mechanical Performance ◽  
Flow Direction ◽  
Graphene Nanoplatelets ◽  
Injection Molding Process ◽  
Molding Process ◽  
Melt Mixing ◽  
Shear Rates ◽  
Waste Tire ◽  
High Shear Rates ◽  
Reinforcing Agent

Homogeneous dispersion of graphene into thermoplastic polymer matrices during melt-mixing is still challenging due to its agglomeration and weak interfacial interactions with the selected polymer matrix. In this study, an ideal dispersion of graphene within the PA66 matrix was achieved under high shear rates by thermokinetic mixing. The flow direction of graphene was monitored by the developed numerical methodology with a combination of its rheological behaviors. Graphene nanoplatelets (GNP) produced from waste-tire by upcycling and recycling techniques having high oxygen surface functional groups were used to increase the compatibility with PA66 chains. This study revealed that GNP addition increased the crystallization temperature of nanocomposites since it acted as both a nucleating and reinforcing agent. Tensile strength and modulus of PA66 nanocomposites were improved at 30% and 42%, respectively, by the addition of 0.3 wt% GNP. Flexural strength and modulus were reached at 20% and 43%, respectively. In addition, the flow model, which simulates the injection molding process of PA66 resin with different GNP loadings considering the rheological behavior and alignment characteristics of GNP, served as a tool to describe the mechanical performance of these developed GNP based nanocomposites.

scholarly journals Melt-Mixed 3D Hierarchical Graphene/Polypropylene Nanocomposites with Low Electrical Percolation Threshold

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1766 ◽  
Author(s):  
Thomas Gkourmpis ◽  
Karolina Gaska ◽  
Davide Tranchida ◽  
Antonis Gitsas ◽  
Christian Müller ◽  
...  
Keyword(s):  
Percolation Threshold ◽  
Mechanical Performance ◽  
Pristine Graphene ◽  
Melt Mixing ◽  
Electrical Percolation ◽  
Β Phase ◽  
Polypropylene Nanocomposites ◽  
Electrical Percolation Threshold ◽  
Filler Dispersion ◽  
Mixed Systems

Graphene-based materials are a family of carbonaceous structures that can be produced using a variety of processes either from graphite or other precursors. These materials are typically a few layered sheets of graphene in the form of platelets and maintain some of the properties of pristine graphene (such as two-dimensional platelet shape, aspect ratio, and graphitic bonding). In this work we present melt mixed graphene-based polypropylene systems with significantly reduced percolation threshold. Traditionally melt-mixed systems suffer from poor dispersion that leads to high electrical percolation values. In contrast in our work, graphene was added into an isotactic polypropylene matrix, achieving an electrical percolation threshold of ~1 wt.%. This indicates that the filler dispersion process has been highly efficient, something that leads to the suppression of the β phase that have a strong influence on the crystallization behavior and subsequent thermal and mechanical performance. The electrical percolation values obtained are comparable with reported solution mixed systems, despite the use of simple melt mixing protocols and the lack of any pre or post-treatment of the final compositions. The latter is of particular importance as the preparation method used in this work is industrially relevant and is readily scalable.

Preparation of polypropylene nanocomposites by melt-mixing: Comparison between three organoclays

2017 ◽  
Vol 134 (28) ◽  
pp. 45053 ◽  
Author(s):  
Guillaume Normand ◽  
Alice Mija ◽  
Sophie Pagnotta ◽  
Edith Peuvrel-Disdier ◽  
Bruno Vergnes
Keyword(s):  
Melt Mixing ◽  
Polypropylene Nanocomposites

Effect of Attapulgite Modification on Properties of Polypropylene Nanocomposites

2013 ◽  
Vol 320 ◽  
pp. 407-412 ◽  
Author(s):  
Qing Guo Tang ◽  
Fei Wang ◽  
Meng Ran Tang ◽  
Fu Qiang Zhang
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Flexural Modulus ◽  
Quadratic Function ◽  
Mechanism Analysis ◽  
Melt Mixing ◽  
Polypropylene Nanocomposites ◽  
Modified Attapulgite ◽  
Function Relationship ◽  
Inorganic Components

Polypropylene nanocomposites were prepared by means of melt mixing using attapulgite as inorganic components. The relation between surface free energy and mechanical properties of polypropylene nanocomposites and elasticized mechanism analysis of modified attapulgite nanofibers were mainly studied. The results showed that the modulus, fracture strength, fracture extensibility, tensile strength, yield strength, bend strength, flexural modulus and dynamic ductility properties of nanocomposites all enhanced obviously after modified attapulgite nanofibers were filled up. Surface free energy of attapulgite nanofibers and impact toughness properties of nanocomposites were in approximate inversely-proportion quadratic function relationship, which could provide a new way of thinking in the field of nanocomposites research.

Mechanical characteristics of the EGJ after fundoplication compared to normal subjects and GERD patients

2001 ◽  
Vol 120 (5) ◽  
pp. A112-A112 ◽  
Author(s):  
J CURRY ◽  
G SHI ◽  
J PANDOLFINO ◽  
R JOEHL ◽  
J BRASSEUR ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Normal Subjects
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