Understanding the roles of nanoparticle dispersion and polymer crystallinity in controlling the mechanical properties of HA/PHBV nanocomposites

Flexible organic elastomeric nanoparticles (ENP) and two kinds of rigid inorganic silica nanoparticles were dispersed respectively into a bisphenol-A epoxy resin in order to tailor and compare the performance of mechanical properties. It was found that the well-dispersed flexible ENP greatly enhanced the toughness of the epoxy with the cost of modulus and strength. Comparatively, the rigid silica nanoparticles improved Young's modulus, tensile strength and fracture toughness simultaneously. Both fumed and sol-gel-formed nanosilica particles conducted similar results in reinforcing the epoxy resin, although the latter exhibited almost perfect nanoparticle dispersion in matrix. The toughening mechanisms of nanocomposites were further discussed based on fractographic analysis.

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Fabrication and mechanical properties of WC nanoparticle dispersion-strengthened copper

Materials Science and Engineering A ◽

10.1016/j.msea.2021.141274 ◽

2021 ◽

pp. 141274

Author(s):

Lu Han ◽

Jing Wang ◽

Yuanyuan Chen ◽

Yuan Huang ◽

Yongchang Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Nanoparticle Dispersion

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Sustainable Additive Manufacturing: Mechanical Response of Polypropylene over Multiple Recycling Processes

Sustainability ◽

10.3390/su13010159 ◽

2020 ◽

Vol 13 (1) ◽

pp. 159

Author(s):

Nectarios Vidakis ◽

Markos Petousis ◽

Lazaros Tzounis ◽

Athena Maniadi ◽

Emmanouil Velidakis ◽

...

Keyword(s):

Mechanical Properties ◽

Mechanical Response ◽

Polymeric Materials ◽

Fused Filament Fabrication ◽

Scanning Calorimetry ◽

3D Printed ◽

Thermomechanical Processes ◽

Multiple Recycling ◽

Plastic Parts ◽

Polymer Crystallinity

The recycling of polymeric materials has received a steadily growing scientific and industrial interest due to the increase in demand and production of durable and lightweight plastic parts. Recycling of such materials is mostly based on thermomechanical processes that significantly affect the mechanical, as well as the overall physicochemical properties of polymers. The study at hand focuses on the recyclability of Fused Filament Fabrication (FFF) 3D printed Polypropylene (PP) for a certain number of recycling courses (six in total), and its effect on the mechanical properties of 3D printed parts. Namely, 3D printed specimens were fabricated from non-recycled and recycled PP material, and further experimentally tested regarding their mechanical properties in tension, flexion, impact, and microhardness. Comprehensive dynamic scanning calorimetry (DSC), thermogravimetric analysis (TGA), Raman spectroscopy, and morphological investigations by scanning electron microscopy (SEM) were performed for the different 3D printed PP samples. The overall results showed that there is an overall slight increase in the material’s mechanical properties, both in tension and in flexion mode, while the DSC characterization indicates an increase in the polymer crystallinity over the recycling course.

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Effect of SiC Nanoparticles Dispersion on the Microstructure and Mechanical Properties of Electroplated Sn-Bi Solder Alloy

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.11.113 ◽

2010 ◽

Vol 11 ◽

pp. 113-118 ◽

Cited By ~ 3

Author(s):

Chang Woo Lee ◽

Y.S. Shin ◽

S.H. Yoo

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Solder Alloy ◽

High Reliability ◽

Nanoparticle Dispersion ◽

Sic Nanoparticles ◽

Microstructure And Mechanical Properties ◽

Nanoparticles Dispersion ◽

Average Grain Size ◽

Joining Strength

The effect of SiC nanoparticle dispersion was investigated for microstructure change and mechanical properties of Sn-Bi electroplated alloys. The diameters of SiC nanoparticle in this study were 45-55 nm. The SiC nanoparticles were mixed with Sn-Bi electroplating and then the nanoparticles were dispersed with ultrasonic vibrator. After the dispersion, the SiC dispersed Sn-Bi alloys were electroplated on Cu deposited Si wafer. The microstructure and mechanical properties of the sample were evaluated by FE-TEM, FE-SEM, EDS, and shear tester. For TEM observation, the specimens were prepared by ultramicrotome and FIB. The SiC nanoparticles were well-dispersed in Sn-Bi alloy. SiC particles were located near grain boundaries or grain inside. The average grain size of the solder alloy was decrease about 30% compared with the grain size of Sn-Bi alloy prepared in the same condition. Due to the grain refinement and dispersion hardening by SiC nanoparticles, the SiC dispersed Sn-Bi alloy is expected to obtain high reliability and joining strength when it applied to interconnection materials.

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Influence of Silica Nanoparticles on Mechanical Properties of HPC

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.825.81 ◽

2016 ◽

Vol 825 ◽

pp. 81-84

Author(s):

Lenka Laiblová ◽

Tomáš Vlach ◽

Anuj Kumar ◽

Alexandru Chira

Keyword(s):

Mechanical Properties ◽

High Performance ◽

High Performance Concrete ◽

Silica Nanoparticle ◽

Sem Analysis ◽

Cement Matrix ◽

Nanoparticle Dispersion ◽

Ultra High Performance Concrete ◽

Weight Content ◽

Nanoparticles Dispersion

Nanotechnology proved to be a useful tool that can significantly improve the mechanical properties of ultra-high performance concrete. This paper presents the results of a long-term research which is focused on the influence of SiO2 nanoparticles on the mechanical properties of high performance concrete. Three types of HPC specimens with a weight content of 0%, 1% and respectively 3% silica nanoparticle were prepared for flexural and compressive tests. SEM analysis was done in order to understand the effect of silica nanoparticle dispersion inside the cement matrix. The aim of this paper was to investigate the nanoparticles dispersion and how it affects concrete’s mechanical properties.

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Correlating Nanoparticle Dispersion to Surface Mechanical Properties of TiO2/Polymer Composites

MRS Proceedings ◽

10.1557/proc-1224-ff10-16 ◽

2009 ◽

Vol 1224 ◽

Cited By ~ 2

Author(s):

Yongyan Pang ◽

Stephanie S. Watson ◽

Aaron M. Forster ◽

Lipiin Sung

Keyword(s):

Mechanical Properties ◽

Laser Scanning ◽

Laser Scanning Confocal Microscopy ◽

Nanoparticle Dispersion ◽

Depth Sensing ◽

Near Surface ◽

Scanning Confocal Microscopy ◽

Latex Coatings ◽

Nanoparticle Clusters ◽

Better Than

AbstractThe objective of this study is to characterize the nanoparticle dispersion and to investigate its effect on the surface mechanical properties of nanoparticle-polymer systems. Two types of TiO2 nanoparticles were chosen to mix in two polymeric matrices: solvent-borne acrylic urethane (AU) and water-borne butyl-acrylic styrene latex (latex) coatings. Nanoparticle dispersion was characterized using laser scanning confocal microscopy. Overall, Particle A (PA, without surface treatment) dispersed better than Particle B (PB, organic treatment) in both systems. The AU-PA system exhibited the best dispersion of the four systems, however PB forms big clusters in both of the matrices. Surface mechanical properties, such as surface modulus at micron and sub-micron length scales were determined from depth sensing indentation equipped with a pyramidal tip or a conical tip. The surface mechanical properties were strongly affected by the dispersion of nanoparticle clusters, and a good correlation was found between dispersion of nanoparticle clusters near surface and the modulus-depth mapping using a pyramid tip.

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Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052584 ◽

1974 ◽

Vol 32 ◽

pp. 514-515

Author(s):

S. Fujishiro

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Transmission Electron Microscopy ◽

Tensile Strength ◽

Mechanical Processing ◽

Ray Method ◽

X Ray ◽

Transmission Electron ◽

Water Quench ◽

Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

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