scholarly journals Preparation and Property of Bio-Polyimide/Halloysite Nanocomposite Based on 2,5-Furandicarboxylic Acid

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4057
Author(s):  
Yingxia Chen ◽  
Shuya Fan ◽  
Xibin Yi ◽  
Bing Li ◽  
Shiwei Chen ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Young’S Modulus ◽  
Water Resistance ◽  
Moisture Absorption ◽  
In Situ Polymerization ◽  
Young's Modulus ◽  
Polyimide Film ◽  
Nanocomposite Films ◽  
Furandicarboxylic Acid

Bio-based polyimide (PI)/halloysite nanotube (HNT) nanocomposites based on 2,5-furandicarboxylic acid were prepared by in situ polymerization. The pristine HNTs were modified by tetraethoxysilane (TEOS) and 4,4′-oxybisbenzenamine (ODA). The bio-based PI/HNT nanocomposite film exhibited lower moisture absorption than pure bio-based polyimide, showing that the water resistance of the bio-based polyimide film was improved. The thermal stability and glass transition temperature (Tg) of PI/HNTs nanocomposites were improved with the addition of modified HNTs. Both the tensile strength and Young’s modulus of bio-based PI/HNTs nanocomposite films were enhanced. A 37.7% increase in tensile strength and a 75.1% increase in Young’s modulus of bio-based PI/HNTs nanocomposite films, with 1 wt% of the modified HNTs, were achieved. The result confirmed that 2,5-furandicarboxylic acid could replace the oil-based material effectively, thus reducing pollution and protecting the environment. Finally, a preparation mechanism to prepare bio-based PI/HNTs nanocomposite is proposed.

Mechanical Properties Of Cu-Based Composites with in Situ Formed Ultrafine Filaments

1981 ◽  
Vol 12 ◽  
Author(s):  
J. Bevk ◽  
W. A. Sunder ◽  
G. Dublon ◽  
David E. Cohen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Young’S Modulus ◽  
Size Dependence ◽  
Young's Modulus ◽  
Plastic Properties ◽  
Young’S Moduli ◽  
Lattice Softening

ABSTRACTElastic and plastic properties of in situ Cu-based composites with Nb, V, and Fe filaments are reviewed. The evidence is presented for a pronounced size dependence of both the ultimate tensile strength and the Young's moduli. In composites with the smallest filaments (d∼50–200Å) and filament densities as high as 1010/cm2 dislocation density reaches values of 1013 cm/cm3. The yield stress of these samples increases dramatically over the predictions based on the “rule of mixtures” and their ultimate tensile strength approaches the estimated theoretical strength of the material (∼2.7GPa). The observed decrease of Young's modulus as a function of inverse wire diameter in the as-drawn composites is attributed to lattice softening due to high density of extended lattice defects. Upon annealing, Young's modulus increases by as much as 100% and exceeds the maximum values calculated from bulk elastic constants. Possible mechanisms leading to modulus enhancement and to related changes in magnetic and superconducting behavior of in situ composites are discussed.

scholarly journals Study the effect of CaCO3 nanoparticles on physical properties of biopolymer blend

2019 ◽  
Vol 16 (39) ◽  
pp. 11-22
Author(s):  
K. J. Mohammed
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Polymer Blend ◽  
Young's Modulus ◽  
Antibacterial Properties ◽  
Young Modulus ◽  
Nanocomposite Films ◽  
Caco3 Nanoparticles ◽  
Mechanical Durability

Chitosan (CH) / Poly (1-vinylpyrrolidone-co-vinyl acetate) (PVP-co-VAc) blend (1:1) and nanocomposites reinforced with CaCO3 nanoparticles were prepared by solution casting method. FTIR analysis, tensile strength, Elongation, Young modulus, Thermal conductivity, water absorption and Antibacterial properties were studied for blend and nanocomposites. The tensile results show that the tensile strength and Young’s modulus of the nanocomposites were enhanced compared with polymer blend [CH/(PVP-co-VAc)] film. The mechanical properties of the polymer blend were improved by the addition of CaCO3 with significant increases in Young’s modulus (from 1787 MPa to ~7238 MPa) and tensile strength (from 47.87 MPa to 79.75 MPa). Strong interfacial bonding between the CaCO3 nanoparticles and the [CH/(PVP-co-VAc)), homogenous distribution of the nanoparticles in the polymer blend, are assistance of noticeably raised mechanical durability. The thermal conductivity of the polymer blend and CaCO3 nanocomposite films show that it decreased in the adding of nanoparticle CaCO3. The solvability measurements display that the nanocomposite has promoted water resistance. The weight gain lowered with the increase of nano CaCO3. Blending chitosan CH with (PVP-co-VAc) enhanced strength and young modules of the nanocomposites and increased the absorption of water because hydrophilic of the blended polymers films. The effect of two types of positive S.aurous and negative E. coli was studied. The results showed that the nanocomposites were effective for both types, where the activity value ranged from (12 ~ 21). The best results were found for S.aurous bacteria.

Enhanced Mechanical-Integrity Characterization of Oilwell Annular Sealants Under In-Situ Downhole Conditions

SPE Journal ◽  
2019 ◽  
Vol 24 (05) ◽  
pp. 2308-2319
Author(s):  
Walmy Cuello Jimenez ◽  
Robert Darbe ◽  
Xueyu Pang
Keyword(s):  
Tensile Strength ◽  
Standardized Testing ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Axial Loading ◽  
Testing Apparatus ◽  
Testing Procedures ◽  
Preliminary Validation ◽  
Three Samples

Summary In this study, we describe an innovative and novel methodology comprising a high–pressure/high–temperature (HP/HT) in–situ–triaxial–testing apparatus for the measurement of sealant mechanical properties (i.e., compressive strength, Young's modulus, and tensile strength) under simulated downhole conditions. The equipment can be used to perform both curing and testing using the same apparatus, thus eliminating depressurization and cooling of test specimens. Additionally, at minimum, three samples can be tested sequentially for statistical analysis and uncertainty mitigation, along with performing real–time monitoring of total HP/HT shrinkage/expansion. The testing apparatus is rated to 30,000 psi for axial loading, 20,000 psi for confining loading, and 400°F. Preliminary validation of Young's modulus was performed with five different plastic samples, yielding error percentages of less than 5% compared to measurements performed using a standardized loading frame. Compressive– and tensile–strength validations were performed using a 16–lbm/gal cement design, and error percentages of less than 2.5 and 7%, respectively, were obtained compared to standardized testing procedures or other studies of the subject. Moreover, a 16–lbm/gal cement system was also used to help assess the functionality of the testing apparatus under simulated wellbore conditions with temperature and pressure ranging from 80 to 350°F and 3,000 to 8,000 psi, respectively.

Young’s Modulus and Tensile Strength of Ti3C2 MXene Nanosheets As Revealed by In Situ TEM Probing, AFM Nanomechanical Mapping, and Theoretical Calculations

Nano Letters ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 5900-5908 ◽  
Author(s):  
Konstantin L. Firestein ◽  
Joel E. von Treifeldt ◽  
Dmitry G. Kvashnin ◽  
Joseph F. S. Fernando ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Theoretical Calculations ◽  
In Situ Tem

Synthesis of Biodegradable β-TCP/PLGA Composites Using Microwave Energy

2006 ◽  
Vol 510-511 ◽  
pp. 758-761 ◽  
Author(s):  
Hyeong Ho Jin ◽  
Sang Ho Min ◽  
Kyu Hong Hwang ◽  
Ik Min Park ◽  
Hong Chae Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Young’S Modulus ◽  
Tricalcium Phosphate ◽  
Bending Strength ◽  
In Situ Polymerization ◽  
Young's Modulus ◽  
Microwave Energy ◽  
Microstructure And Mechanical Properties

Biodegradable β-tricalcium phosphate (β-TCP)/poly (lactide-co-glycolide) (PLGA) composites were synthesized by in situ polymerization with microwave energy. The influence of the β-TCP content in β-TCP/PLGA composites on the molecular weight, crystallinity, microstructure, and mechanical properties was investigated. As the molecular weight of composites decreased, the β-TCP content increased up to 10 wt%, while further raising of the β-TCP content above 10%, the molecular weight increased with increasing β-TCP content. This behavior may be ascribed to the superheating effect or nonthermal effect induced by microwave energy. It was found that the bending strength and Young’s modulus of the β-TCP/PLGA composites were proportional to the molecular weight of PLGA. The bending strength of the β-TCP/PLGA composites ranged from 18 to 38 MPa, while Young’s modulus was in the range from 2 to 6 GPa.

scholarly journals Drying Effect on Mechanical Properties of Bio-nanocomposite Films Fabricated from Self-assembled Cellulose Nanocrystals into Potato Starch

2020 ◽  
pp. 129-138
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Cellulose Nanocrystals ◽  
Young's Modulus ◽  
Potato Starch ◽  
Aqueous Suspension ◽  
Nanocomposite Films ◽  
Elongation At Break ◽  
Natural Drying

Composites films with higher mechanical properties from naturally occurring degradable materials are of present demand to achieve goals of sustainable development. Interaction within composite constituents during drying controls mechanical properties. Here, bio-nanocomposites films were first prepared from cellulose nanocrystals synthesized from jute fibres and extracted potato starch with the same chemical formulations. The filler, nanocrystals consist of nanorod-like cellulose particles obtained as an aqueous suspension by sulfuric acid (H2SO4) hydrolysis of jute fibres and the matrix was prepared by plasticization of potato starch after disruption of starch granules with water and glycerin. Nanocomposite films were obtained by casting the homogeneous aqueous suspension at 95oC and followed by natural drying (atmospheric drying, 25oC) and oven drying at 40oC. The thickness of the bio-nanocomposites film about 250 μm was controlled by using a 2 mm thick structural glass frame. It is revealed that with increasing the percentage of cellulose nanocrystals in composite films, mechanical properties corresponding to tensile strength and Young’s modulus were increased significantly. The film containing the highest quantity of cellulose nanocrystals (20% w/w of starch) revealed better properties in case of natural drying (tensile strength 84.2 MPa, Young’s modulus 0.563 GPa, elongation at break 27%) than the film properties (tensile strength 35.2 MPa, Young’s modulus 0.423 GPa, elongation at break 20%) of oven drying.

Effect of mixing ratio on mechanical properties of mixture of chitin nanofibers and microfibrillated cellulose reinforced PVA hybrid nanocomposites

2021 ◽  
Vol 11 (9) ◽  
pp. 1523-1533
Author(s):  
Yong-Ping Li ◽  
Hitoshi Takagi ◽  
Antonio N. Nakagaito ◽  
Takumi Watanabe
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Microfibrillated Cellulose ◽  
Hybrid Nanocomposites ◽  
Nanocomposite Films ◽  
Mixing Ratio ◽  
Mixing Ratios ◽  
Chitin Nanofibers

In order to explore the possibility of polyvinyl alcohol (PVA) reinforced by mixture of chitin nanofibers (ChNFs) and microfibrillated cellulose (MFC) instead of a single reinforcing phase, mechanical properties of PVA based hybrid nanocomposites reinforced with combination of ChNFs and MFC in various mixing ratios were investigated. For comparison, two different experiments were conducted to prepare nanocomposite films by casting technical processing, where ratios of ChNFs to MFC were mixed varying from 1:0, 4:1, 3:2, 1:1, 2:3, 1:4, and 0:1 in both projects, while in Project 1 the weights of PVA and ChNFs were always kept constant and the weight of PVA only was kept constant in Project 2. The results were as follows: (1) The hybrid ternary nanocomposites acquired the highest Young’s modulus and tensile strength when ratio of ChNFs to MFC was 1:1, which exhibited higher Young’s modulus and higher tensile strength than PVA/ChNFs composites, but delivered higher Young’s modulus and similar tensile strength comparing to PVA/MFC composites; (2) Aggregations and voids inside nanocomposites were detrimental to mechanical properties of PVA based hybrid nanocomposites. In some industries such as food packing, PVA based hybrid nanocomposites at mixing ratio 1:1 of ChNFs to MFC are applied presumably with ChNFs partly instead of MFC in the future.

scholarly journals Crystallography-Derived Young’s Modulus and Tensile Strength of AlN Nanowires as Revealed by in Situ Transmission Electron Microscopy

Nano Letters ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 2084-2091 ◽  
Author(s):  
Konstantin L. Firestein ◽  
Dmitry G. Kvashnin ◽  
Joseph F.S. Fernando ◽  
Chao Zhang ◽  
Dumindu P. Siriwardena ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Transmission Electron

Preparation and Properties of Nano-Hydroxyapatite Modified Nylon Composites

2009 ◽  
Vol 87-88 ◽  
pp. 228-232
Author(s):  
Li Yun Zheng ◽  
Zhi Min Liu ◽  
Ya Jun Zhao
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Tensile Strength ◽  
Body Fluid ◽  
Moisture Absorption ◽  
In Situ Polymerization ◽  
Average Molecular Weight ◽  
Ultrasonic Dispersion ◽  
Infrared Spectrometer

To enhance the mechanical property and the bioactivity of composites, nano-hydroxyapatite (n-HA) modified monomer casting nylon-6 (n-HA/N) composites were prepared by in situ polymerization. During the synthesis of n-HA/N composite, the n-HA and caprolactam were mixed, melt and placed in the field of ultrasonic radiation. The differences between composite with ultrasonic and without ultrasonic were investigated. The tensile strength and the viscosity average molecular weight of the nylon matrix were measured. The results show that the molecular weight of the nylon matrix decreased firstly and it had the lowest value when the content of nano-hydroxyapatite was 1.6 wt.%. After that the molecular weight increased and then it began to decrease when it reached the highest value. But the tensile strength of the n-HA/N composite were improved. The ultrasonic dispersion made the n-HA more evenly dispersed in the nylon and increased the mechanical properties of the n-HA/N composites significantly. The bioactivity and moisture absorption of n-HA/N composites in simulated body fluid (SBF) were examined and compared to pure nylon. What's more, Fourier transform infrared spectrometer was used to characterize the structure of the materials formed on the surface of the composite. The results showed that moisture absorption of the n-HA/N composites was lower than that of the pure nylon. After composites impregnated 16 days in SBF, a layer of carbon hydroxyapatite (CHA) with weak crystalline was formed on the surface of sample. This phenomenon showed that the n-HA/N composites have good bioactivity.

Effect of Microcrystalline Cellulose from Banana Stem Fiber on Mechanical Properties and Crystallinity of PLA Composite Films

2011 ◽  
Vol 695 ◽  
pp. 170-173 ◽  
Author(s):  
Voravadee Suchaiya ◽  
Duangdao Aht-Ong
Keyword(s):  
Tensile Strength ◽  
Young’S Modulus ◽  
Microcrystalline Cellulose ◽  
Young's Modulus ◽  
Agricultural Waste ◽  
Composite Films ◽  
Sem Image ◽  
Biocomposite Films ◽  
Twin Screw ◽  
Banana Stem

This work focused on the preparation of the biocomposite films of polylactic acid (PLA) reinforced with microcrystalline cellulose (MCC) prepared from agricultural waste, banana stem fiber, and commercial microcrystalline cellulose, Avicel PH 101. Banana stem microcrystalline cellulose (BS MCC) was prepared by three steps, delignification, bleaching, and acid hydrolysis. PLA and two types of MCC were processed using twin screw extruder and fabricated into film by a compression molding. The mechanical and crystalline behaviors of the biocomopsite films were investigated as a function of type and amount of MCC. The tensile strength and Young’s modulus of PLA composites were increased when concentration of MCC increased. Particularly, banana stem (BS MCC) can enhance tensile strength and Young’s modulus of PLA composites than the commercial MCC (Avicel PH 101) because BS MCC had better dispersion in PLA matrix than Avicel PH 101. This result was confirmed by SEM image of fractured surface of PLA composites. In addition, XRD patterns of BS MCC/PLA composites exhibited higher crystalline peak than that of Avicel PH 101/PLA composites

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