scholarly journals Copper-Polyurethane Composite Materials: Particle Size Effect on the Physical-Chemical and Antibacterial Properties

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1934
Author(s):  
Cristian Miranda ◽  
Johanna Castaño ◽  
Emky Valdebenito-Rolack ◽  
Felipe Sanhueza ◽  
Rody Toro ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Composite Materials ◽  
Thermoplastic Polyurethane ◽  
Antibacterial Properties ◽  
Copper Particle ◽  
Copper Particles ◽  
Polyurethane Composite ◽  
Natural Concentration ◽  
Blending Method

In this work, thermoplastic polyurethane (TPU) composites incorporated with 1.0 wt% Cu particles were synthesized by the melt blending method. The effect of the incorporated copper particle size on the antibacterial, thermal, rheological, and mechanical properties of TPU was investigated. The obtained results showed that (i) the addition of copper particles increased the thermal and mechanical properties because they acted as co-stabilizers of polyurethane (PU) (ii) copper nanoparticles decreased the viscosity of composite melts, and (iii) microparticles > 0.5 µm had a tendency to easily increase the maximum torque and formation of agglomerates. SEM micrographics showed that a good mixture between TPU and copper particles was obtained by the extrusion process. Additionally, copper-TPU composite materials effectively inhibited the growth of the Gram-negative Escherichia coli and the Gram-positive Staphylococcus aureus. Considering that the natural concentration of copper in the blood is in the range of 0.7–0.12 mg/L and that the total migration value of copper particles from TPU was 1000 times lower, the results suggested that TPU nanocomposites could be adequately employed for biomedical applications without a risk of contamination.

scholarly journals Ultrafine portland cement performance

2018 ◽  
Vol 68 (330) ◽  
pp. 157 ◽  
Author(s):  
C. Argiz ◽  
E. Reyes ◽  
A. Moragues
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Portland Cement ◽  
Silica Fume ◽  
Structure Refinement ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Blending Method ◽  
Cement Based Materials ◽  
Ultrafine Cement

By mixing several binder materials and additions with different degrees of fineness, the packing density of the final product may be improved. In this work, ultrafine cement and silica fume mixes were studied to optimize the properties of cement-based materials. This research was performed in mortars made of two types of cement (ultrafine Portland cement and common Portland cement) and two types of silica fume with different particle-size distributions. Two Portland cement replacement ratios of 4% and 10% of silica fume were selected and added by means of a mechanical blending method. The results revealed that the effect of the finer silica fume mixed with the coarse cement enhances the mechanical properties and pore structure refinement at a later age. This improvement is somewhat lower in the case of ultrafine cement with silica fume.

scholarly journals Influence of Characteristics of Thermoplastic Polyurethane on Graphene-Thermoplastic Polyurethane Composite Film

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 129
Author(s):  
Zhi-Min Zhou ◽  
Ke Wang ◽  
Kai-wen Lin ◽  
Yue-Hui Wang ◽  
Jing-Ze Li
Keyword(s):  
Electrical Conductivity ◽  
Composite Film ◽  
Thermoplastic Polyurethane ◽  
Tape Casting ◽  
Composite Films ◽  
Casting Process ◽  
Melting Points ◽  
Polyurethane Composite ◽  
Blending Method ◽  
Functional Fillers

Graphene-thermoplastic polyurethane (G-TPU) composite films were fabricated by traditional blending method and tape casting process with commercial graphene sheets as functional fillers and TPU masterbatches of four different melting points as matrix, respectively. The effects of matrix on the distribution of graphene, the electrical conductivity, and infrared (IR) light thermal properties of the G-TPU composite films were investigated. The experimental results reveal that the characteristics of TPU has little influence on the electrical conductivity of the G-TPU composite films, although the four TPU solutions have different viscosities. However, under the same graphene mass content, the thermal conductivity of four G-TPU composite films with different melting points is significantly different. The four kinds of G-TPU composite films have obvious infrared (IR) thermal effect. There is little difference in the temperatures between the composite films prepared by TPU with melting a point of 100 °C, 120 °C, and 140 °C, respectively; however, when the content of graphene is less than 5 wt%, the temperature of the composite film prepared by TPU with a melting point of 163 °C is obviously lower than that of the other three composite films. The possible reason for this phenomenon is related to the structure of TPU.

Preparation and Characterization of GNP/TPU Composites

2014 ◽  
Vol 644-650 ◽  
pp. 4760-4762 ◽  
Author(s):  
Bao Feng Xu ◽  
Sheng Lai ◽  
Zhi Dan Lin ◽  
Jiang Ming Chen ◽  
Jun Lin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermoplastic Polyurethane ◽  
Graphene Nanoplatelets ◽  
Melt Blending ◽  
Frictional Properties ◽  
Blending Method ◽  
Properties Of Composites

Graphene nanoplatelets (GNP) and thermoplastic polyurethane (TPU) have been often used as filler and matrix, respectively, to produce composites. In this work, TPU/GNP composites were prepared via a melt blending method. The mechanical properties and frictional properties of TPU/GNP composites were investigated. Because the GNP is very expensive, we investigated to use graphite as the filler, to use PP-g-MAH as the compatibilizer and examined the characteristics of the prepared composites. Frictional properties and mechanical properties of GNP/TPU composites remarkably improve when adding PP-g-MAH as the compatibilizer. Tensile strength of composite containing 10wt % of GNP and 10wt% PP-g-MAH was measured as 25.5MPa. When the graphite was used to replace for GNP, the frictional properties of composites decreased, but the mechanical properties improved.

scholarly journals Comparison of Mechanical and Antibacterial Properties of TiO2/Ag Ceramics and Ti6Al4V-TiO2/Ag Composite Materials Using Combined SLM-SPS Techniques

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 874 ◽  
Author(s):  
Ramin Rahmani ◽  
Merilin Rosenberg ◽  
Angela Ivask ◽  
Lauri Kollo
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Structural Integrity ◽  
Antibacterial Effect ◽  
Antibacterial Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Titanium Alloy Ti6al4v ◽  
Increased Strength ◽  
Doped Titania

In present work, the combination of spark plasma sintering (SPS) and selective laser melting (SLM) techniques was introduced to produce composite materials where silver-doped titania (TiO2) ceramics were reinforced with ordered lattice structures of titanium alloy Ti6Al4V. The objective was to create bulk materials with an ordered hierarchical design that were expected to exhibit improved mechanical properties along with an antibacterial effect. The prepared composite materials were evaluated for structural integrity and mechanical properties as well as for antibacterial activity towards Escherichia coli. The developed titanium–silver/titania hybrids showed increased damage tolerance and ultimate strength when compared to ceramics without metal reinforcement. However, compared with titania/silver ceramics alone that exhibited significant antibacterial effect, titanium-reinforced ceramics showed significantly reduced antibacterial effect. Thus, to obtain antibacterial materials with increased strength, the composition of metal should either be modified, or covered with antibacterial ceramics. Our results indicated that the used method is a feasible route for adding ceramic reinforcement to 3D printed metal alloys.

scholarly journals Improvement of the electromechanical properties of thermoplastic polyurethane composite by ionic liquid modified multiwall carbon nanotubes

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 166-178
Author(s):  
Qianwei Xu ◽  
Weijia Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Constant ◽  
Ionic Liquid ◽  
Elastic Modulus ◽  
Thermoplastic Polyurethane ◽  
Multiwall Carbon Nanotubes ◽  
Electromechanical Properties ◽  
Polyurethane Composite ◽  
Blending Method ◽  
Multiwall Carbon

Abstract Carbon nanotubes (CNTs) were non-covalently modified by two categories of ionic liquids (ILs), including 1-vinyl-3-ethylimidazole bromide (VEIMBr) and 1-vinyl-3-hexylimidazole bromide (VHIMBr) in the ratio of 1:1 and 1:4, respectively. The surface interaction between CNTs and ILs was well-characterized by FTIR, Raman spectra, XPS, etc. Thermoplastic polyurethane (TPU) containing different amounts of CNTs/ILs was fabricated by melting blending method. TPU-CNTs/ILs composites exhibited simultaneously enhanced electromechanical properties with improved dielectric constant and lowered elastic modulus. The electromechanical sensitivity of sample TPU-3CNT/12VHIMBr increased by approximately 45 times in comparison with that of pure TPU at 200 Hz. Besides, improved dispersion of CNTs/ILs in the TPU matrix was also exhibited.

scholarly journals Optimizing Processing Parameters and Fiber Size for Kenaf Fiber Reinforced Thermoplastic Polyurethane Composite

2011 ◽  
Vol 471-472 ◽  
pp. 297-302 ◽  
Author(s):  
Y.A. El-Shekeil ◽  
S.M. Sapuan ◽  
E.S. Zainudin ◽  
Abdan Khalina
Keyword(s):  
Impact Strength ◽  
Thermoplastic Polyurethane ◽  
Processing Parameters ◽  
Short Fiber ◽  
Mean Value ◽  
Hibiscus Cannabinus ◽  
Polyurethane Composite ◽  
Blending Method ◽  
Fiber Size ◽  
Internal Mixer

In this study, composite of Themoplastic polyurethane (TPU) reinforced with short fiber (Hibiscus Cannabinus) kenaf (KF) were prepared via melt blending method using Haake Polydrive R600 internal mixer. Effect of various processing temperatures, times and speeds on tensile strength was studied, together with effect of various fiber sizes on tensile, flexural properties and impact strength. Optimum blending parameters were 190°C, 11 min, and 40 rpm for temperature, time and speed, respectively. Using the optimum processing parameters TPU-KF composites with different fiber sizes were prepared. Composite sheets were prepared by hot press machine at 190 °C for 10 min. Five samples were cut from the composite sheet. Mean value was taken for each composite according to ASTM standards. Tensile and flexural strength were best for fibers between 125-300 micron. Impact strength showed an increasing trend with increasing fiber size.

Enhanced mechanical properties of silica nanoparticle-covered cross-linking graphene oxide filled thermoplastic polyurethane composite

2018 ◽  
Vol 42 (4) ◽  
pp. 3069-3077 ◽  
Author(s):  
Hui Ren ◽  
Yuming Zhou ◽  
Man He ◽  
Ran Xu ◽  
Binbin Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Thermoplastic Polyurethane ◽  
Silica Nanoparticle ◽  
Cross Linking ◽  
Simultaneous Reduction ◽  
Polyurethane Composite

In this work, stacking graphene oxide (GOE) and silica nanoparticle-covered cross-linking graphene oxide (GOES) were successfully synthesized by using EDA simultaneous reduction and functionalization GO.

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