Mechanical Properties of Rubber Scrap – Polyolefine Compositions

2002 ◽  
Vol 18 (3) ◽  
pp. 173-193
Author(s):  
Ewa Kowalska
Keyword(s):  
Mechanical Properties ◽  
Maximum Amount ◽  
Twin Screw Extruder ◽  
Mechanism Of Formation ◽  
Screw Extruder ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Twin Screw

The mechanical properties and the structure of sections of specimens prepared from rubber scrap – polyolefin compositions were investigated. The comminuted vulcanised rubber scrap rubber scrap was used in an amount of 5 – 75 wt%. The mode of incorporation and the method of preparation of the composition in a single-screw or a twin screw extruder, was examined. The maximum amount of the rubber scrap that can be added to compositions prepared by single screw extruder and a twin screw extruder was found to be up to 75 wt% and up to 30 wt% and for both polyolefins, respectively. Silanes were studied as additives intended to compatibilize thermoplastics and rubber scrap. The mode of incorporation of silanes and the method of preparation of the composition were examined. The mechanism of formation of rubber scrap – polyolefin compositions was defined.

Mechanical and Interfacial Properties of Hydrolyzed Kevlar Fiber Reinforced Wood Flour/HDPE Composites

2011 ◽  
Vol 221 ◽  
pp. 27-31 ◽  
Author(s):  
Rong Xian Ou ◽  
Qing Wen Wang ◽  
Fei Pin Yuan ◽  
Bao Yu Liu ◽  
Wei Jun Yang
Keyword(s):  
Mechanical Properties ◽  
Wood Flour ◽  
Flexural Modulus ◽  
Tensile Modulus ◽  
Screw Extruder ◽  
Kevlar Fiber ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Twin Screw ◽  
Matrix Morphology

Hydrolyzed Kevlar fibers (KFs) were compouded into high-density polyethylene (HDPE) with wood flour (WF) by twin-screw/single-screw extruder to investigate the reinforcement effects of KFs on the mechanical properties of conventional WF/HDPE composites. Maleated HDPE (MAPE) was used as a compatibilizer. The mechanical properties significantly improved as the KFs loading increases in the presence of 4% MAPE, such as tensile strength 14.7%, tensile modulus 12.4%, flexural strength 22.2%, flexural modulus 22.4%, and impact strength 41.7% with 2 wt.% KFs compared to WF/HDPE composite with MAPE. The fiber matrix morphology of the interface region in the composites was examined using scanning electron microscopy (SEM).

scholarly journals Comparative study on the properties of PVC/TPU blends prepared by single screw and twin screw extruder

2010 ◽  
Vol 7 (2) ◽  
pp. 457-466 ◽  
Author(s):  
G. M. Shashidhara ◽  
K. G. Pradeepa ◽  
Rupalika Goel ◽  
R. Bharath ◽  
Arun Dhumal Rao ◽  
...  
Keyword(s):  
Weight Ratio ◽  
High Hardness ◽  
Mechanical And Thermal Properties ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Variable Weight ◽  
Twin Screw ◽  
Two Phases

In this work, we have compared the mechanical and thermal properties PVC/TPU blends with variable weight ratio prepared using single screw and twin screw extruder. Two grades of TPUs differing in hardness (Shore A hardness 66 and 85) are used in making the blends. The tensile strength of PVC/TPU-1 and PVC/TPU-2 blends obtained from twin screw extruder is higher by 39% - 98% and 89% - 143% than that obtained from single screw extruder, which indicates intimate mixing of two phases in twin screw extruder. Beyond 30 % of TPU content, the blends of TPU-2 (high hardness grade) exhibit relatively high modulus compared to blends of TPU-1. The blends prepared by twin screw extruder were relatively harder. The rebound resilience of blends prepared by twin screw extruder was found to be always more. The rebound resilience of PVC/TPU-1 blends is relatively more compared to PVC/TPU-2 blends due to more number of soft segments in TPU-1. The blends were also characterized by abrasion resistance, MFI, DSC and TEM.

Effect of Flow Field on Online Shear Viscosity of PP/nano-CaCO3 Composites

2006 ◽  
Author(s):  
Guo Jiang ◽  
Hanxiong Huang
Keyword(s):  
Shear Viscosity ◽  
Chaotic Mixing ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Rheological Analysis ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Mixing Intensity ◽  
Twin Screw ◽  
High Shearing

Polymer nanocomposites have been regarded as a new category of engineering materials and attracted technical and scientific interest. Recently rheological analysis became an effective tool for investigating the microstructures of nanocomposites. However, the online rheological property of nanocomposites during compounding was seldom studied. In this work, two types of screw configurations in twin-screw extruder were selected, one provides high shearing intensity and the other provides high shearing/mixing intensity. In addition, chaotic mixing was induced by installing a single screw extruder with a convective screw at the end of the twin-screw extruder to compound the nanocomposites. The online melt shear viscosity of nanocomposite was measured using Haake ProFlow online rheometer. Effects of high shearing, high shearing/mixing, and chaotic mixing on the online shear viscosity for polypropylene (PP)/nano-calcium carbonate (nano-CaCO3) composites were investigated. The study showed that the chaotic mixing facilitates the processing of the nanocomposite.

scholarly journals Effects of a Twin-Screw Extruder Equipped with a Molten Resin Reservoir on the Mechanical Properties and Microstructure of Recycled Waste Plastic Polyethylene Pellet Moldings

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1058
Author(s):  
Hikaru Okubo ◽  
Haruka Kaneyasu ◽  
Tetsuya Kimura ◽  
Patchiya Phanthong ◽  
Shigeru Yao
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Value Added ◽  
Industrial Applications ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Polymer Properties ◽  
Wide Range ◽  
Twin Screw ◽  
Recycled Plastics

Each year, increasing amounts of plastic waste are generated, causing environmental pollution and resource loss. Recycling is a solution, but recycled plastics often have inferior mechanical properties to virgin plastics. However, studies have shown that holding polymers in the melt state before extrusion can restore the mechanical properties; thus, we propose a twin-screw extruder with a molten resin reservoir (MSR), a cavity between the screw zone and twin-screw extruder discharge, which retains molten polymer after mixing in the twin-screw zone, thus influencing the polymer properties. Re-extruded recycled polyethylene (RPE) pellets were produced, and the tensile properties and microstructure of virgin polyethylene (PE), unextruded RPE, and re-extruded RPE moldings prepared with and without the MSR were evaluated. Crucially, the elongation at break of the MSR-extruded RPE molding was seven times higher than that of the original RPE molding, and the Young’s modulus of the MSR-extruded RPE molding was comparable to that of the virgin PE molding. Both the MSR-extruded RPE and virgin PE moldings contained similar striped lamellae. Thus, MSR re-extrusion improved the mechanical performance of recycled polymers by optimizing the microstructure. The use of MSRs will facilitate the reuse of waste plastics as value-added materials having a wide range of industrial applications.

Effect of a Coupling Agent on Mechanical and Biological Properties of Polyetheretherketone/Hydroxyapatite Bioactive Composite for Prosthetic Medical Device

2011 ◽  
Vol 471-472 ◽  
pp. 898-903 ◽  
Author(s):  
Ahmad Ramli Rashidi ◽  
Uzir Wahit Mat ◽  
R.A. Abdullah
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
Flexural Modulus ◽  
Biological Properties ◽  
Screw Extruder ◽  
Composite Surface ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Sbf Solution ◽  
Ceramic Hydroxyapatite

For many years, research was focused on developing a medical part of human body from polymer as to replace metal. In this study, the aim is to produce a Polyetheretherketone/Hydroxyapatite (PEEK/HA) composite which posses balance mechanical properties and good spreading of bioactive ceramic, hydroxyapatite. The composite consist of 10-30 wt% HA were compounded via nano-single screw extruder and sample for testing were produced by injection molding. Each formulation of HA was treated with (3-Aminopropyl)trimethoxysilanes coupling agent to compare with untreated HA. The result showed that the slight increasing value of Elastic modulus, flexural strength, tensile strength while decreasing flexural modulus for 10 and 20 wt% HA compared to untreated composite. The enhance of bioactivity has been proven with the incorporation of HA into PEEK. SEM-EDX image showed the bulk formation of apatite layers on the composite surface with 30 wt% HA after 3 days immersed in SBF solution. Finally, these composite be capable of being one of the biomedical part seing as the mechanical properties were found to be within the properties of human cortical and cancellous bone.

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