Influence of Melt-Mixing Process Conditions on Mechanical Performance of Organoclay/Fluoroelastomer Nanocomposites

2016 ◽  
Vol 31 (1) ◽  
pp. 2-10 ◽  
Author(s):  
M. Khajehpour ◽  
U. Sundararaj
Keyword(s):  
Mechanical Performance ◽  
Process Conditions ◽  
Mixing Process ◽  
Melt Mixing

Revaluation of Australian palm residues in polypropylene composites: Statistical influence of fiber treatment

2020 ◽  
pp. 002199832096053 ◽  
Author(s):  
Noelle C Zanini ◽  
Rennan FS Barbosa ◽  
Alana G de Souza ◽  
Derval S Rosa ◽  
Daniella R Mulinari
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Mechanical Performance ◽  
Alkali Treatment ◽  
Mechanical Analysis ◽  
Melt Mixing ◽  
Polypropylene Composites ◽  
Matrix Interactions ◽  
Fiber Treatment ◽  
Fiber Matrix

Australian palm residues are generated by palm heart industry in large quantities and are considered an underused material with a composition rich in lignocellulosic structures. This residue is generally utilized as briquettes for energy or sheep feed; however, few works investigate this residue as composite fillers. This work aimed to revalue Australian palm residues (PR) by preparing polypropylene composites through melt mixing, using different fiber contents (0, 5, 10, 20, and 30 wt%), and evaluate the statistical influence of fibers (residues) alkali treatment (MPR) in composites mechanical properties. PR and MPR were evaluated by FTIR, XRD, SEM, TGA, and composites were assessed using thermal and mechanical analysis, in which ANOVA statistical analysis was applied. The residues addition increased the mechanical properties and their treatment enhanced the stiffness of the composites compared to pristine PP. However, ANOVA demonstrated that at low residues contents, surface treatment does not increase fiber-matrix interactions effectively, then tensile properties were statistically similar to PP. Considering tensile properties, 20% MPR showed statistically distinct properties, with significative enhancements; no filler contents dependence was verified. Flexural properties were more sensitive to residue loading, and composites with 30% PR and MPR presented superior mechanical performance. This difference is associated with a higher sensitivity of tensile stress towards fiber-matrix interactions, which was improved with fiber treatment. Also, the residues content and treatment influenced the composites' thermal stability, with better results for PP-MPR. Results indicate that palm residue is an excellent filler for improving composites' thermal and mechanical properties, with a greener character.

Mechanism of Exchange in PBT/PC and PET/PC Blends. Composition of the Copolymer Formed in the Melt Mixing Process

1998 ◽  
Vol 31 (3) ◽  
pp. 650-661 ◽  
Author(s):  
Giorgio Montaudo ◽  
Concetto Puglisi ◽  
Filippo Samperi
Keyword(s):  
Mixing Process ◽  
Melt Mixing

scholarly journals Influence of the addition sequence of PVA-fibers and water on mixing and rheological behavior of mortars

2016 ◽  
Vol 9 (2) ◽  
pp. 226-243 ◽  
Author(s):  
M. S. de França ◽  
F. A. Cardoso ◽  
R. G. Pileggi
Keyword(s):  
Rheological Behavior ◽  
Mechanical Performance ◽  
Mixing Time ◽  
Mix Design ◽  
Mixing Process ◽  
Water Addition ◽  
Test Parameters ◽  
The Matrix ◽  
Mixing Sequences ◽  
The Moment

ABSTRACT The mixing process of fiber-containing cementitious suspensions is a crucial factor to obtaining a good dispersion of fibers and guarantee adequate mechanical performance of the hardened products. The addition of fibers into the suspension causes reduction of the fluidity of the system due to factors inherent to the fibers, the matrix and their interaction. During mixing, these interactions make dispersion and homogenization processes more difficult due to the formation of fibers - particles agglomerates. Conventional techniques to assess workability of mortars are inadequate to evaluate the rheological behavior of fiber-reinforced systems, in which parameters like viscosity and yield stress are not completely taken into account. Therefore, this work employs rotational rheometry to evaluate the influence of fiber and water addition sequences on mixing and rheological behavior of mortars containing Polyvinyl Alcohol (PVA) fibers. Constant test parameters were: mixing time of 317s; impeller velocity 126.5 rpm; water flow 128g/s. A constant mix design was used with a water content of 16%wt, and a 0.2%vol of fibers were added to the reference composition. Four mixing sequences were studied: S1 and S2 are based on the addition of fibers at different stages of the mixing process; while in S3 and S4 not only the fibers are added at different stages, but also the water addition is performed in two steps (25% first and 75% latter).Results showed that it is possible to optimize the mixing step of fiber-containing systems by changing the moment of fiber addition into the mixture. The introduction of fibers after mixing the dry mortar with water, when it already had achieved its fluidity point, demanded a lower mixing effort and produced a more flowable material.

Investigation of Mixing Processes of Polymer Composites

2012 ◽  
Vol 729 ◽  
pp. 332-337
Author(s):  
G. Dogossy ◽  
E. Sági ◽  
Ferenc Ronkay
Keyword(s):  
Charpy Impact ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Homogeneous Distribution ◽  
Mixing Process ◽  
Wear Properties ◽  
Melt Mixing ◽  
Adhesion Promoter ◽  
Multiwalled Carbon ◽  
Mixing Processes ◽  
Ultrahigh Molecular Weight

Three ultrahigh molecular weight polyethylene (UHMWPE) composites of differing composition, reinforced with multiwalled carbon nanotubes (MWCNT) were prepared. The homogeneous distribution of MWCNT has been attempted by two dry blending methods and one melt-mixing process. The efficiency of the various methods was characterized by their effects on the quasi-static and dynamic physical properties of the composites. In the case of composites manufactured by ball milling the effects of various adhesion promoter additives (compatibilizers) has also been studied by analyzing the tensile, flexural, Charpy impact and wear properties of the composites.

Mechanical Properties of VGCF/MAPP and Atmospheric Plasma-Treated VGCF/PP by Melt-Mixing Process

2010 ◽  
Vol 19 (4) ◽  
pp. 381-392 ◽  
Author(s):  
Nguyen Quang Khuyen ◽  
Byung Sun Kim ◽  
Joon Hyung Byun ◽  
Soo Lee
Keyword(s):  
Mechanical Properties ◽  
Atmospheric Plasma ◽  
Mixing Process ◽  
Melt Mixing

scholarly journals Mechanical performance of roselle/sugar palm fiber hybrid reinforced polyurethane composites

BioResources ◽  
2018 ◽  
Vol 13 (3) ◽  
pp. 6238-6249
Author(s):  
A. M. Radzi ◽  
S. M. Sapuan ◽  
M. Jawaid ◽  
M. R. Mansor
Keyword(s):  
Impact Strength ◽  
Mechanical Performance ◽  
Hybrid Composites ◽  
Testing Machine ◽  
Morphological Properties ◽  
Scanning Electron Micrographs ◽  
Melt Mixing ◽  
Palm Fiber ◽  
Sugar Palm Fiber ◽  
Scanning Electron

The effect of sugar palm fiber (SPF) loading was studied relative to the mechanical properties of roselle (RF)/SPF/thermoplastic polyurethane (TPU) hybrid composites. RF/SPF/TPU hybrid composites were fabricated at different weight ratios (100:0, 75:25, 50:50, 25:75, and 0:100) by melt mixing and hot compression. The mechanical (tensile, flexural, and impact test) and morphological properties of tensile fractured samples were examined using a universal testing machine, impact machine, and scanning electron microscope. It was found that the hybridization of RF/SPF increased its impact strength corresponding to the increases in the SPF content of the composites. The tensile and flexural properties of the hybrid composites decreased due to poor interfacial bonding between the fiber and matrix. Scanning electron micrographs of the tensile fractured surface of the RF/SPF hybrid composites revealed fiber pullouts and poor adhesion bonding. In conclusion, the hybridization of SPF with RF/TPU composites enhanced its impact strength while decreasing the tensile and flexural strength.

scholarly journals Low Density Wood Particleboards Bonded with Starch Foam—Study of Production Process Conditions

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1975 ◽  
Author(s):  
Sandra Monteiro ◽  
Jorge Martins ◽  
Fernão D. Magalhães ◽  
Luísa Carvalho
Keyword(s):  
Mechanical Performance ◽  
Hold Time ◽  
Operating Conditions ◽  
Process Conditions ◽  
Low Density ◽  
Thickness Swelling ◽  
Hot Plate ◽  
Pressing Time ◽  
Two Stages ◽  
Platen Temperature

It has been shown that wood particleboards bonded with sour cassava starch can display low density combined with good physico-mechanical performance, thanks to starch being able to produce a strong foam that fills the interparticular space. Here we optimize the pressing conditions for the production of these panels. The procedure involved hot-plate pressing in two stages: (1) lowering the top platen to a specified thickness for a duration designated as pressing time, followed by (2) raising the top platen to allow panel expansion for a duration designated as hold time. The parameters studied were the pressing time (10 to 150 s), the hold time (290 to 890 s), and the top platen temperature (80 to 190 °C). The hold time and pressing time showed to be crucial parameters. The best operating conditions corresponded to 600 s of press cycle time, comprising 60 s of pressing time and 540 s of hold time. The top platen temperature used was 190 °C. The particleboards produced had a density of 405 kg·m−3, an internal bond strength of 0.44 N·mm−2, and a thickness swelling of 13.2%. This can be considered as very good performance, taking into account the panels’ low density.

Effect of Coupling Agent on the Mechanical Properties of Flame Retardant PP/ATH Nanocomposites

2013 ◽  
Vol 812 ◽  
pp. 241-245 ◽  
Author(s):  
Fatimah A’thiyah Sabaruddin ◽  
Noorasikin Samat
Keyword(s):  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Flame Retardant ◽  
Polymer Nanocomposites ◽  
Coupling Agent ◽  
Mixing Process ◽  
Melt Mixing ◽  
Impact Tests ◽  
Moulding Machine ◽  
Mechanical Performances

Polymer nanocomposites containing polypropylene (PP) as the polymer matrix and nanofiller aluminium hydroxide (ATH) as the flame retardant filler were compounded with various loading of maleic anhydride grafted polypropylene, MAPP (0, 1, 2, 3, 5 wt %). All materials were mixed using melt mixing process and were further prepared using an injection moulding machine. The mechanical performances of the samples were characterized using tensile and impact tests. Improvements were observed for the tensile and impact properties of the PP/ATH samples after being loaded with MAPP. MAPP loading of 1 wt % was determined to be the optimum content of coupling agent addition as this loading enabled the best performance of the nanocomposite in tensile and impact tests. Different morphologies of the fracture surfaces for all samples were characterized using FESEM analysis.

DYNAMIC MECHANICAL PROPERTIES OF NANOCOMPOSITES WITH POLY (VINYL BUTYRAL) MATRIX

2010 ◽  
Vol 24 (06n07) ◽  
pp. 805-812 ◽  
Author(s):  
A. M. TORKI ◽  
I. ŽIVKOVIĆ ◽  
V. R. RADMILOVIĆ ◽  
D. B. STOJANOVIĆ ◽  
V. J. RADOJEVIĆ ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Dynamic Mechanical Properties ◽  
Titania Nanoparticles ◽  
Mixing Process ◽  
Melt Mixing ◽  
Dynamic Mechanical ◽  
The Matrix ◽  
Silica And Titania ◽  
Vinyl Butyral

This work reports the preparation of SiO 2 and TiO 2/poly (vinyl butyral) nanocomposites with enhanced dynamic mechanical properties. Silica and titania nanoparticles were introduced in the matrix as the neat powder and as colloidal sol using the melt mixing process. Composites reinforced with colloidal sol silica and titania showed higher mechanical properties than the ones reinforced with as-received particles. When sol TiO 2 particles are used, the highest increase of storage modulus of about 54% is obtained for 5 wt% loading, while for sol SiO 2, the storage modulus increases with the addition of nanosilica with the largest increase of about 99% for 7 wt% loading. In addition, nanocomposites were introduced within Kevlar/PVB composites. The addition of 5 wt% silica and titania colloidal sol lead to the remarkable increase of the storage modulus for about 98 and 65%, respectively. Largest contribution of nanoreinforcements in lowering the glass transition temperature is observed for 7 wt% loading of TiO 2 and SiO 2 colloidal sol.

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