Influence of Twin-Screw Extrusion on The Dispersion of Nanoclay in Vinylester Composites

2021 ◽  
Vol 5 (2) ◽  
pp. 260-267
Author(s):  
Bommanna K ◽  
Radha H R ◽  
Yuvaraja Naik ◽  
Mahendra K V ◽  
A Hareesh
Keyword(s):  
Mechanical Properties ◽  
Interlaminar Shear Strength ◽  
Scanning Electron Micrographs ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Interlaminar Shear ◽  
Scanning Electron

This paper reports the dispersion of nanoclay in vinylester using co-rotating twin screw extrusion and ultrasonication for preparing nanoclay/vinylester gel coat. Two sets MMT/vinylester specimens, namely Type 1 and Type 2 were prepared for comparative studies. While Type 1 specimens were prepared using ultrasonication only, Type 2 specimens were prepared using both ultrasonication and twin-screw extrusion. Type 2 specimens showed lower levels of nanoclay intercalation and higher levels of exfoliation.  By using the MMT/vinylester gel coat so prepared by the two different routes, MMT/vinylester/glass specimens were fabricated and tested for mechanical properties. Type 2 based nanocomposite specimens showed greater values of ultimate tensile strength, flexural strength, interlaminar shear strength and impact strength. Scanning Electron Micrographs (SEM) of tensile fractured Type 2 based specimens showed less agglomeration of nanoclay than that of Type 1 based specimens.

scholarly journals Behavior of triplex steel containing different aluminum content

2017 ◽  
Vol 17 (1) ◽  
pp. 34-43 ◽  
Author(s):  
M. I. Masoud ◽  
M. Tashkandi ◽  
J. Al-Jarrah ◽  
A. I. Z. Farahat
Keyword(s):  
Mechanical Properties ◽  
Aluminum Content ◽  
Hot Forging ◽  
Air Cooling ◽  
Scanning Electron Micrographs ◽  
Maximum Hardness ◽  
Steel Type ◽  
Scanning Electron

Abstract Medium-carbon alloy steels containing different aluminum contents were hot forged by 95% reduction at 1200°C followed by air cooling. Optical and scanning electron microscopes were used to investigate the morphologies of the different phases present. An austentizing process followed by water quenching (after hot forging) was carried out to obtain different hardness values. The intensity of the different planes was investigated using X-ray diffraction. The mechanical properties were characterized using tensile and hardness tests. Optical and scanning electron micrographs revealed a great effect of aluminum content on the steel properties. A matrix of bainite and pearlite and traces of ferrite was revealed for hot forged steel type 1 containing 1% Al. Steel type 2 containing 2% Al showed a matrix of pearlite and ferrite with the absence of bainite. The hardness increased with increasing the temperature to a maximum value then decreased for steel containing 1 and 2% aluminum. After austentizing at 925°C, the maximum hardness of 649Hv was recorded for hot forged steel type 2 of 2% aluminum, while steel type 1 of 1% aluminum showed a maximum hardness of 531Hv after austentizing at 1000°C. Thus, the maximum hardness of hot forged steels decreased with increasing aluminum content. In addition, the maximum tensile and yield strength were decreased by increasing the aluminum content in the steel. The changes in microstructure and mechanical properties of these steels could be explained by the effect of aluminum as a ferrite forming element.

Effect of Compatibilizers on Composite Materials of Bio-Ethanol Byproduct-Poly(lacticacid)

2012 ◽  
Vol 204-208 ◽  
pp. 4088-4092
Author(s):  
Ming Ming Zhang ◽  
Xiao Huan Liu ◽  
Chun Peng Wang ◽  
Li Wei Jin
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Composite Materials ◽  
Extrusion Process ◽  
Poly Lactic Acid ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Process Effects ◽  
Properties Of Composites

The blend composite materials of bio-ethanol byproduct-Poly(lactic acid) (PLA) were produced by a twin-screw extrusion process. Effects of bio-ethanol byproduct (BEB) contents and different compatibilizers on properties of composite materials were investigated. The research showed that with the increase of contents of bio-ethanol byproduct, the mechanical properties decreased. The mechanical properties of composites were improved by adding the compatibilizers, especially the polypropylene grafted maleic anhydride (PP-MAH). When the PP-MAH content was 2.5%, the mechanical properties of the composite materials were superior to others.

Cellulolytic Enzyme Lignin Efficiently Blended with Polycaprolactone: Thermal, Mechanical Properties and Morphological Evaluation

2014 ◽  
Vol 1070-1072 ◽  
pp. 100-106
Author(s):  
Wen Zhu Ouyang ◽  
Yong Huang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Test ◽  
Cellulolytic Enzyme ◽  
Twin Screw Extrusion ◽  
Morphological Evaluation ◽  
Screw Extrusion ◽  
Thermal Mechanical Properties ◽  
Twin Screw ◽  
The Cost ◽  
The Impact

In this study, cellulolytic enzyme lignin (CEL) was blended with polycaprolactone (PCL) by twin-screw extrusion and injection molding. The thermal, mechanical properties and the morphology of the PCL/CEL blends were investigated as a function of CEL content. The results showed that the CEL in the blends acting as nucleus accelerated the crystallization of PCL when CEL was not more than 10 wt%, but retarded PCL to crystallize with more CEL addition. Thermogravimetry analysis (TGA) revealed that the thermal stability of the PCL/CEL blends was almost unaffected by increasing CEL content. Mechanical test showed that, although the elongation at break and the impact strength were decreased, the strength and the modulus of the PCL/CEL blends were significantly higher than those of the neat PCL. Scanning electron microscopy (SEM) observations indicated that the CEL and the PCL were in good miscibility and there was a good adhesion at the interface of the CEL filler and the PCL matrix, suggesting that CEL could be potential filler used in PCL-based materials to reduce the cost of the friendly material, whereas increased its strength and modulus.

Mechanical Properties of Poly(ether ether ketone) Composites Reinforced by Carbon Nano-Platelet Chains and Nanoalumina

2011 ◽  
Vol 24 (6) ◽  
pp. 755-766 ◽  
Author(s):  
S. Joseph ◽  
V.A. Bambole ◽  
P.A. Mahanwar
Keyword(s):  
Mechanical Properties ◽  
Filler Content ◽  
Dielectric Strength ◽  
Filler Loading ◽  
Twin Screw Extrusion ◽  
Ether Ether Ketone ◽  
Screw Extrusion ◽  
Poly Ether Ether Ketone ◽  
Twin Screw ◽  
Thermal Stability Of

Carbon nanoplatelet and nanoalumina reinforced PEEK nanocomposites were fabricated by twin-screw extrusion followed by injection molding. The effect of the filler loading on mechanical properties, morphology, dielectric strength, and thermal stability of the composites has been analyzed. The mechanical properties were found to increase with nanoplatelet content up to 1% loading (optimum filler content) and after that, due to agglomeration of filler, slight decrease in properties were observed. For alumina-filled systems mechanical properties increased with increasing filler content due to the well-dispersed fillers in the composites. The modulus and toughness of alumina-filled composites were higher than platelet-filled composites.

scholarly journals Multi-Micro/Nanolayer Films Based on Polyolefins: New Approaches from Eco-Design to Recycling

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 413
Author(s):  
Geraldine Cabrera ◽  
Ibtissam Touil ◽  
Emna Masghouni ◽  
Abderrahim Maazouz ◽  
Khalid Lamnawar
Keyword(s):  
Mechanical Properties ◽  
Multilayer Films ◽  
Twin Screw Extrusion ◽  
Mechanical Recycling ◽  
Structure And Property ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Promising Solution ◽  
Recycling Systems ◽  
Property Control

This paper describes a future-oriented approach for the valorization of polyethylene-based multilayer films. The method involves going from eco-design to mechanical recycling of multilayer films via forced assembly coextrusion. The originality of this study consists in limiting the number of constituents, reducing/controlling the thickness of the layers and avoiding the use of tie layers. The ultimate goal is to improve the manufacturing of new products from recycled multilayer materials by simplifying their recyclability. Within this framework, new structures were developed with two polymer systems: polyethylene/polypropylene and polyethylene/polystyrene, with nominal micro- and nanometric thicknesses. Hitherto, the effect of the multi-micro/nanolayer architecture as well as initial morphological and mechanical properties was evaluated. Several recycling processes were investigated, including steps such as: (i) grinding; (ii) monolayer cast film extrusion; or (iii) injection molding with or without an intermediate blending step by twin-screw extrusion. Subsequently, the induced morphological and mechanical properties were investigated depending on the recycling systems and the relationships between the chosen recycling processes or strategies, and structure and property control of the recycled systems was established accordingly. Based on the results obtained, a proof of concept was demonstrated with the eco-design of multi-micro/nanolayer films as a very promising solution for the industrial issues that arise with the valorization of recycled materials.

Research on Processing Technology Product Design and the Application of Nano-Wood-Plastic Composite Materials

2020 ◽  
Vol 20 (12) ◽  
pp. 7787-7792
Author(s):  
Xin Fang ◽  
Jinjin Rong ◽  
Yilin Deng ◽  
Moon-Hwan Jee
Keyword(s):  
Mechanical Properties ◽  
Wood Plastic Composite ◽  
Twin Screw Extrusion ◽  
Cross Sectional ◽  
Plastic Composite ◽  
Screw Extrusion ◽  
Different Types ◽  
The Matrix ◽  
Twin Screw ◽  
Treatment Agent

This study focused on the design of wood-plastic composite (WPC) products. In this study, recycled high-density polyethylene plastic was used as the matrix, wood powder was used as the filler, different types of nanofillers and self-synthesized nanofiller treatment agents were added, and the twin-screw extrusion granulation method was used to prepare nano-WPC materials. The effects of different types of nanofillers on the mechanical properties of nano-WPC materials were investigated, and the cross-sectional structures of the materials were analyzed by scanning electron microscopy. The results showed that nanofiller treatment agents improved the interface compatibility of the materials. When the treatment agent content reached 2.5% and the nano-montmorillonite content reached 10%, the mechanical properties of the material reach their maximum values.

Electrical and mechanical properties of partially bio‐based PP/PBS blends nanocomposites elaborated by twin‐screw extrusion

2021 ◽  
pp. 51401
Author(s):  
Mouhja Bencharki ◽  
Sébastien Rondot ◽  
Ahmed Tara ◽  
Omar Jbara ◽  
Françoise Berzin
Keyword(s):  
Mechanical Properties ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw

scholarly journals Well-Dispersed Cellulose Nanofiber in Low Density Polyethylene Nanocomposite by Liquid-Assisted Extrusion

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 927 ◽  
Author(s):  
Tengku Arisyah Tengku Yasim-Anuar ◽  
Hidayah Ariffin ◽  
Mohd Nor Faiz Norrrahim ◽  
Mohd Ali Hassan ◽  
Yoshito Andou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Morphological Analysis ◽  
Cellulose Nanofiber ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Melt Blending ◽  
Twin Screw Extrusion ◽  
Liquid Feeding ◽  
Screw Extrusion ◽  
Twin Screw

Two different liquid assisted processing methods: internal melt-blending (IMB) and twin-screw extrusion (TWS) were performed to fabricate polyethylene (PE)/cellulose nanofiber (CNF) nanocomposites. The nanocomposites consisted maleic anhydride-grafted PE (PEgMA) as a compatibilizer, with PE/PEgMA/CNF ratio of 97/3/0.5–5 (wt./wt./wt.), respectively. Morphological analysis exhibited that CNF was well-dispersed in nanocomposites prepared by liquid-assisted TWS. Meanwhile, a randomly oriented and agglomerated CNF was observed in the nanocomposites prepared by liquid-assisted IMB. The nanocomposites obtained from liquid-assisted TWS exhibited the best mechanical properties at 3 wt.% CNF addition with an increment in flexural strength by almost 139%, higher than that of liquid-assisted IMB. Results from this study indicated that liquid feeding of CNF assisted the homogenous dispersion of CNF in PE matrix, and the mechanical properties of the nanocomposites were affected by compounding method due to the CNF dispersion and alignment.

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