MEASUREMENTS OF RHEOLOGYCAL AND MECHANICAL-, THERMO-MECHANICAL PROPERTIES OF PVC/CORN COB FOAM COMPOSITE

In this paper, the modification of PVC/Corn cob blends was investigated. Rheological and diffusion properties of blends are important to learn the behavior of blend’s in molten state, because it will provide information necessary for the processing. Nowadays, the development of biomaterials has become a primary goal for material engineers. Using materials from natural sources gives an option to modify PVC structures and properties. The following mechanical properties of the prepared composite were determined; tensile-, bending strength and hardness. The PVC/Corn cob blends have increased impact strength and the other mechanical properties can be improved as well. The relationship between the morphology and properties of the foam were also investigated. The result of DSC and dynamic mechanical analysis showed that the blends form a partially compatible system. The rheological analysis showed that the PVC composite with corn cob could be processed and recycled using regular thermoplastic processing systems.

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Novolac/Phenol-Containing Phthalonitrile Blends: Curing Characteristics and Composite Mechanical Properties

Polymers ◽

10.3390/polym12010126 ◽

2020 ◽

Vol 12 (1) ◽

pp. 126 ◽

Cited By ~ 1

Author(s):

Hanqi Zhang ◽

Bing Wang ◽

Yanna Wang ◽

Heng Zhou

Keyword(s):

Mechanical Properties ◽

Fracture Strain ◽

Mechanical Test ◽

Gelation Time ◽

Mechanical Analysis ◽

Curing Temperature ◽

Hydroxyl Group ◽

Rheological Analysis ◽

Curing Characteristics ◽

Ft Ir

The phenol-containing phthalonitrile resin is a kind of self-curing phthalonitrile resin with high-temperature resistance and excellent properties. However, the onefold phthalonitrile resin is unattainable to cured completely, and the brittleness of the cured product is non-negligible. This paper focuses on solving the above problems by blending novolac resin into phenol-containing phthalonitrile. Under the action of abundant hydroxyl group, the initial curing temperature and gelation time at 170 °C decrease by 88 °C and 2820 s, respectively, monitored by DSC and rheological analysis. FT-IR spectra of copolymers showed that the addition of novolac increased the conversion rate of nitrile. When the novolac mass fraction is 10%, the peak of nitrile group disappears, which means the complete reaction. The mechanical test of blends composites shows that the maximum fracture strain of 10 wt% novolac addition is 122% higher than those of neat phthalonitrile composites on account of the introduction of flexible novolac chain segments. The mechanical properties are sensitive to elevated post-cured temperature; this is consistent with the result of morphological investigation using SEM. Finally, the dynamic mechanical analysis indicated that the glass transition temperature heightened with the increase of novolac content and post-curing temperature.

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Evaluation of Grinding Performance by Mechanical Properties of Super Abrasive Wheel - Evaluation of Grade by Grinding Force

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.656-657.266 ◽

2015 ◽

Vol 656-657 ◽

pp. 266-270 ◽

Cited By ~ 1

Author(s):

Takekazu Sawa ◽

Naohiro Nishikawa ◽

Yasushi Ikuse

Keyword(s):

Mechanical Properties ◽

Evaluation Method ◽

Bending Strength ◽

Diamond Wheel ◽

Grinding Force ◽

Grinding Wheel ◽

Abrasive Wheel ◽

Grinding Performance ◽

Relationship Of ◽

The Relationship

There is the grade as one of the selection criteria of a grinding wheel like WA whetstone or GC whetstone. The grade of grinding wheel is defined as an index which shows the strength of connection of a grain and a grain, and is usually estimated by bending strength. There are many papers about the relationship between the grade of a grinding wheel and the grinding performance. And, the relationship between the grade of a grinding wheel and the grinding performance is almost clear. Also, the relationship between mechanical properties of a grinding wheel and the grade is also clear. On the other hand, since the grain layer of a super abrasive grinding wheel is thin, it is difficult to apply the conventional evaluation test of the grade. And, the evaluation method of the grade which can be adapted the super abrasive grinding wheel is not established. In addition, since the grade of a super abrasive grinding wheel is a manufacture manufacturer's original standard, there is a minute difference by manufacturer. The super abrasive grinding wheel as well as the grinding wheel is conjectured that the grade influences the grinding performance. Namely, it is important to relate the grade and the mechanical properties of a grain layer. However, researches which relate the grade, the grinding performance and the mechanical properties of a super abrasive grinding wheel are not done so far. Therefore, this study examined the relationship between the mechanical properties of a grain layer of a super abrasive grinding wheel and the grade, the grinding performance. The final objective of this study is to evaluate the grinding performance from mechanical properties of a grain layer of a super abrasive grinding wheel. The purpose of this report is to clarify relationship between the grade and the grinding force in a resinoid bond diamond wheel. The specific experiment procedure is as follows. When carrying out surface grinding of the diamond sticks using a grinding wheel, the relationship of the grade and the grinding force was clarified. And based on the knowledge acquired in this experiment, relationship between the grade of a super abrasive grinding wheel and the grinding force was considered. As the results, it confirmed that the grade of a resinoid bond diamond wheel could be evaluated by the grinding force.

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Mechanical Properties of Nanoparticle Hydroxyapatite/gelatin Constructs

MRS Proceedings ◽

10.1557/proc-1063-oo05-04 ◽

2007 ◽

Vol 1063 ◽

Author(s):

Steven Fox ◽

Inessa Stanishevskaya ◽

Shafiul Chowdhury ◽

Shane Catledge ◽

Andrei Stanishevsky

Keyword(s):

Mechanical Properties ◽

Young’S Modulus ◽

Bending Strength ◽

Young's Modulus ◽

Bone Microarchitecture ◽

Bone Substitutes ◽

Mechanical Analysis ◽

Model Material ◽

Bending Modulus ◽

Nanoparticle Dispersions

ABSTRACTBone consists of up to 70% mostly nanocrystalline hydroxyapatite (HA), and the rest is mostly collagen. One can suggest that synthetic nanoHA/collagen composites could potentially be the closest materials to resemble the bone microarchitecture and prepare resorbable bone substitutes and scaffolds. However, the data on the mechanical properties and property/structure relationships of HA/collagen composites are still scarce. It can be explained, in part, by the high cost of collagen and substantial amounts of materials needed for many tests. However, gelatin is cheap, has many properties similar to collagen, and can be used as a model material for the mechanical testing of HA-based composites. In this study, we report the results of an investigation of some mechanical properties of HA/gelatin composites with 0 to 80% HA nanoparticle (size 15-60 nm) loading by weight. The HA nanoparticle dispersions were mixed with gelatin in trifluoroethanol or in water in different ratios and placed in Teflon molds to produce the sheets with the thickness in the range of 0.4 – 1.0 mm. Nanoindentation technique was used to determine the Young's modulus and hardness. Bending tests were performed using dynamic mechanical analysis with the amplitudes in the 1 – 50 micron range at 1 Hz. The values of Young's modulus (1 – 20 GPa), hardness (70 – 500 MPa) and bending modulus (0.3 – 2.4 GPa) were obtained. The highest values of the Young's modulus and hardness of these composite materials were achieved for 40% – 60% HA content by weight, which was close to the values for similar HA/collagen composites. However, the maximum bending strength was observed for 20 – 35% HA content. We discuss further the observed trends of the mechanical properties and their dependence on other factors such as the test conditions, sample geometry, and HA particle size.

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Fabrication of Ti2AlC/TiAl Composites with the Addition of Niobium by Spark Plasma Sintering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.1004 ◽

2008 ◽

Vol 368-372 ◽

pp. 1004-1006 ◽

Cited By ~ 1

Author(s):

Yun Long Yue ◽

H.T. Wu

Keyword(s):

Mechanical Properties ◽

Spark Plasma Sintering ◽

Bending Strength ◽

Three Point Bending ◽

Plasma Sintering ◽

Titanium Aluminum ◽

Spark Plasma ◽

The Difference ◽

The Relationship

Ti2AlC/TiAl composites with the addition of niobium were prepared by spark plasma sintering using titanium, aluminum, niobium elemental powers and TiC particles as reactants. The experimental and analytical studies on this kind of material concentrated on the relationship between reinforcement phase and mechanical properties. The Ti2AlC/TiAl composites with 5% niobium exhibit high mechanical properties. The three-point bending strength and fracture toughness reaches as high as 915MPa and 23 MPa·m1/2, respectively. It is found that the in-situ reaction occurs at 1100°C with the addition of niobium at the interface between the TiAl matrix and original reinforcement TiC. Further XRD results indicate that the difference in the reinforcement phase from TiC to Ti2AlC is one of the most important origins to the variation in mechanical properties.

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Effect of Holding Time on Microstructure and Properties of VC/Fe Composite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.723.353 ◽

2012 ◽

Vol 723 ◽

pp. 353-357

Author(s):

Guo Jun Zhang ◽

Zhi Ping Sun ◽

Li Yan Zou

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Relative Density ◽

Bending Strength ◽

Holding Time ◽

Microstructure And Properties ◽

Microstructure And Mechanical Properties ◽

Relationship Of ◽

The Relationship ◽

Better Than

The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different holding time were studied. Holding time can influence the mechanical properties, with the holding time rising, when the holding time is 80 min, the hardness is Max, it’s 10.71 GPa, the enhancing range is 37.66%; The relative density changes slower from 60 to 100 min; when the holding time is 60 minutes, fracture toughness and bending strength of material is 16.17 MPa•m 1/2 and 1070 MPa, it’s better than before.

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Obtaining and characterization of a composite with polymer matrix and corn cob waste filler

Research Society and Development ◽

10.33448/rsd-v9i12.10849 ◽

2020 ◽

Vol 9 (12) ◽

pp. e32791210849

Author(s):

Mariana Lima de Oliveira ◽

Luiz Guilherme Meira De Souza ◽

Raimundo Vicente Pereira Neto ◽

Jaciel Cardoso de Lima

Keyword(s):

Mechanical Properties ◽

Bending Strength ◽

Polyester Resin ◽

Low Density ◽

Particle Sizes ◽

Thermal And Mechanical Properties ◽

Corn Cob ◽

Grain Sizes ◽

Powder Formulation

It was studied the feasibility of using corn cob to obtain a polymer composite. It was used of the corn cob in Three-grain sizes, and some formulations of the composite of polyester resin and powders were used, and the most appropriate formulation was chosen. For the characterization of the composite thermal and mechanical properties were determined. The main advantage of the composite was the low density, about 1.06 kg/m³ for the thick powder formulation. The composite presented an inferior mechanical behavior concerning the resin for all the studied particle sizes and formulations. The composite presented better mechanicals results for the bending strength, reaching 25.3 MPa for the thick powder formulation. The composite also proved itself to be viable for thermal applications since it has average thermal conductivity inferior to 0.21 W/m, being classified as thermal insulation and can be used to manufacture structures that do not require significant mechanical strength, such as tables, chairs, benches, panels, works of art, crafts and solar prototypes, such as ovens and stoves.

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Dynamic Mechanical Analysis of Bulk Carbon Nanotube Materials

MRS Proceedings ◽

10.1557/proc-1204-k18-48 ◽

2009 ◽

Vol 1204 ◽

Author(s):

Brian T. Moses ◽

Paul R. Jarosz ◽

Christopher M. Schauerman ◽

Jack Alvarenga ◽

Brian J. Landi ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Composite Material ◽

Carbon Nanotube ◽

Mechanical Strength ◽

Mechanical Analysis ◽

Processing Techniques ◽

Oxidation Parameters ◽

The Relationship ◽

Bulk Carbon

AbstractSeveral purification and processing techniques for laser-produced single wall carbon nanotube (SWCNT) soot were investigated and the resulting changes in the mechanical properties were characterized. SWCNT ribbons had non-nanotube carbonaceous content modified via thermal oxidation and the relationship between oxidation parameters and mechanical strength studied. SWCNT/Polyamide composites were developed and exhibited improved toughness, tensile strength and elongation before break. The composite material is observed to have a greater tensile strength than either the baseline paper or the added nylon.

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Mechanical Properties of Botanical Recycled Concrete under Different Production Conditions

10.20944/preprints202005.0024.v1 ◽

2020 ◽

Author(s):

Li Liang ◽

Yuya Sakai

Keyword(s):

Mechanical Properties ◽

Bending Strength ◽

Production Condition ◽

Wood Flour ◽

Recycled Concrete ◽

Mass Ratio ◽

Production Temperature ◽

New Material ◽

The Relationship ◽

Production Conditions

Botanical recycled concrete, or concrete bonded with wood, is formed by heat pressing the mixture of concrete and wooden waste. Botanical recycled concrete is a relatively new material and the relationship between production condition and its real-world performance is not clear yet. This experimental study investigated the influence of several production condition factors on the density and bending strength of botanical recycled concrete. As a result, temperature and mass ratio of concrete powder to wood flour presented significant effects on the density of this botanical recycled concrete. The increase in production temperature resulted in a remarkable increment in density and bending strength. This is probably due to increased wood flowability and accelerated compaction and bonding formation. The fineness of wood flour had a significant effect on improving bending strength. This is attributed to a larger contact surface between the wood substance and concrete particles.

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A Molecular Modelling Approach for Designing Bioartificial Membranes for Clinical Use With Tailored Transport Properties

ASME 2007 Summer Bioengineering Conference ◽

10.1115/sbc2007-176371 ◽

2007 ◽

Author(s):

Mariana Ionita ◽

Alfonso Gautieri ◽

Emiliano Votta ◽

Alberto Redaelli

Keyword(s):

Mechanical Properties ◽

Acrylic Acid ◽

Small Molecules ◽

Experimental Studies ◽

Computational Method ◽

Poly Vinyl Alcohol ◽

Clinical Use ◽

And Diffusion ◽

Modelling Approach ◽

Diffusion Properties

There has been a demand for hemodialysis membranes with better biocompatibility, the use of which would reduce the incidence of complications in patients who have been under long hemodialysis treatment. Recently, highly biocompatible membranes have been obtained by blending synthetic and polymers [1]. Specifically, poly(vinyl-alcohol) (PVA) and poly(acrylic acid) (PAA) have been combined with chitosan (Chi) and dextran (Dex) to create a biomaterials with excellent biocompatibility and mechanical properties. In this work we present a computational method based on molecular mechanics (MM) and dynamics (MD) techniques have been combined with an experimental studies, with the aim of designing and forecasting the permeability and diffusion properties of these membranes to small molecules, as a function of their composition.

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Effect of Type and Concentration of Nanoclay on the Mechanical and Physicochemical Properties of Bis-GMA/TTEGDMA Dental Resins

Polymers ◽

10.3390/polym12030601 ◽

2020 ◽

Vol 12 (3) ◽

pp. 601 ◽

Cited By ~ 1

Author(s):

J. J. Encalada-Alayola ◽

Y. Veranes-Pantoja ◽

J. A. Uribe-Calderón ◽

J. V. Cauich-Rodríguez ◽

J. M. Cervantes-Uc

Keyword(s):

Mechanical Properties ◽

Bending Strength ◽

Mechanical Analysis ◽

Resin Composites ◽

Dental Resin ◽

Mineral Concentration ◽

Dental Resins ◽

Organically Modified ◽

Minimum Depth ◽

Dental Restorative

Bis-GMA/TTEGDMA-based resin composites were prepared with two different types of nanoclays: an organically modified laminar clay (Cloisite® 30B, montmorillonite, MMT) and a microfibrous clay (palygorskite, PLG). Their physicochemical and mechanical properties were then determined. Both MMT and PLG nanoclays were added into monomer mixture (1:1 ratio) at different loading levels (0, 2, 4, 6, 8 and 10 wt.%), and the resulting composites were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and mechanical testing (bending and compressive properties). Thermal properties, depth of cure and water absorption were not greatly affected by the type of nanoclay, while the mechanical properties of dental resin composites depended on both the variety and concentration of nanoclay. In this regard, composites containing MMT displayed higher mechanical strength (both flexural and compression) than those resins prepared with PLG due to a poor nanoclay dispersion as revealed by SEM. Solubility of the composites was dependent not only on nanoclay-type but also the mineral concentration. Dental composites fulfilled the minimum depth cure and solubility criteria set by the ISO 4049 standard. In contrast, the minimum bending strength (50 MPa) established by the international standard was only satisfied by the dental resins containing MMT. Based on these results, composites containing either MMT or PLG (at low filler contents) are potentially suitable for use in dental restorative resins, although those prepared with MMT displayed better results.

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