Hybrid nanocomposite hydrogels with high strength and excellent self-recovery performance

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 59131-59140 ◽  
Author(s):  
Jia Yang ◽  
Lin Zhu ◽  
Xiaoqiang Yan ◽  
Dandan Wei ◽  
Gang Qin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Hybrid Nanocomposite ◽  
Nanocomposite Hydrogels ◽  
Large Hysteresis ◽  
Recovery Performance ◽  
Physical And Chemical

Hybrid nanocomposite hydrogels (NC gels) with physical and chemical crosslinkings exhibit improved mechanical properties and large hysteresis. Moreover, hybrid NC gels also demonstrate excellent self-recovery properties.

Study of Whiskers to be Used in Composite Materials

2021 ◽  
Vol 316 ◽  
pp. 51-55
Author(s):  
Tamara I. Shishelova ◽  
Vadim V. Fedchishin ◽  
Mikhail A. Khramovskih
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Chemical Properties ◽  
High Strength ◽  
Rapid Expansion ◽  
Physical And Chemical Properties ◽  
Reinforcement Fiber ◽  
Object Of Study ◽  
Physical And Chemical ◽  
And Chemical Properties

Rapid expansion of technologies poses higher requirements to structural materials and items made of them. Conventional materials are being replaced by composite materials (composites). Different additives enhancing the properties of initial materials are used as reinforcement fibers of composites. Utilization of micro-and nanosize particles for production of present-day materials is paid much attention to. Whiskers are among such materials. These crystals have high strength, high chemical and temperature resistance. But for rational utilization of whickers of different chemical composition in composite materials one should know their physical and chemical properties. Objectives of the paper: to study physical and chemical properties of whiskers in different compounds, their composition and structure; to prove experimentally the feasibility of utilizing whiskers as a reinforcement fiber of composite materials. Object of study: specimens of whiskers of silicon nitride (Si3N4), aluminum oxide (Al2O3), aluminum nitride (AlN), and mullite (Al6Si2O13). Methods of investigation: thermal study of specimens, study of mechanical properties and chemical strength, and IR-spectroscopy. Results of study: specimens of whiskers have been studied and their mechanical properties have been tabulated for comparison. Extensive thermal investigation was followed by deduction of regularities and identification of chemical properties of whiskers. IR-spectra of whiskers have been studied and conclusions on molecular composition and on presence of impurities in some whiskers have been made.

The Study on Mechanical Properties of POSS Hybrid PVA Hydrogels

2014 ◽  
Vol 1022 ◽  
pp. 30-33
Author(s):  
Yi Chen ◽  
Jun Hong Yang ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compression Strength ◽  
Water Soluble ◽  
Polymer Chains ◽  
Hybrid Nanocomposite ◽  
Nanocomposite Hydrogels

A novel POSS hybrid nanocomposite hydrogels were synthesized by introducing water-soluble Oa-POSS into the PVA hydrogels. The mechanical properties are obviously dependent on the composition of gels. With the increase of Oa-POSS, the tensile strength and modulus increases significantly while the elongation break decreases. The gels exhibit higher compression strength than pure PVA hydrogels. This phenomenon is attributed to the effective entanglement of polymer chains around nanoparticles and enhanced interaction between PVA chains.

Effects on Concrete Bonding of Green Universiti Sains Malaysia Reinforced Concrete (GUSMRC) at Elevated Temperatures

2015 ◽  
Vol 802 ◽  
pp. 166-171
Author(s):  
Nur Liyana Zainal ◽  
Norazura Muhamad Bunnori
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Bonding Strength ◽  
Elevated Temperatures ◽  
High Strength ◽  
Palm Oil Fuel Ash ◽  
New Class ◽  
Sustainable Environment ◽  
Oil Fuel ◽  
Physical And Chemical

The design of the concrete mixtures of Ultra High Performances Fibre Reinforced Concrete (UHPFRC) is related to a densely compacted cementitious matrix and has outstanding material characteristics involving workability and high mechanical properties. Generally it is a combination between high strength concrete and fibres. UHPFRC offers high compressive strength which is higher than a normal concrete. The application of POFA as a cement replacement enhances the transport properties of concrete and contributes to a sustainable environment. The utilization of 50% UPOFA in mix design leads to develop a new class of concrete designated as GUSMRC. GUSMRC mixtures enhance the mechanical behaviour of concrete. GUSMRC with 50% replacement of the total binder content by ultrafine palm oil fuel ash (UPOFA) could contribute sustainability of environmental. The development of UHPFRC and its application in the field may contribute a good bonding strength at interface as a repair material between a new and old material. However, complex properties of materials can change dramatically when exposed to the elevated temperatures and adversely affected. The physical and chemical will change when occurred to heat. This paper investigates the change in mechanical properties of UHPFRC at elevated temperature and to determine the bonding strength between two layers which is overlay and concrete substrate

Multi-responsive nanocomposite hydrogels with high strength and toughness

2016 ◽  
Vol 4 (9) ◽  
pp. 1733-1739 ◽  
Author(s):  
Jingli Yang ◽  
Shuang Liu ◽  
Ying Xiao ◽  
Guorong Gao ◽  
Yuanna Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Nanocomposite Hydrogels ◽  
Strength And Toughness

Poly(NIPAM-co-DAC) hydrogels containing thermoresponsive units and positive charges show high mechanical properties and responsiveness to temperature, pH, and ion strength.

TECHNOLOGICAL AND OPERATIONAL CHARACTERISTICS OF THE VSE-62 LOW-VISCOSITY EPOXY RESIN WITH INCREASED POT LIFE AND ITS APPLICATION

2021 ◽  
pp. 43-50
Author(s):  
I.V. Terekhov ◽  
◽  
A.I. Tkachuk ◽  
K.I. Donetsky ◽  
R.Yu. Karavaev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
High Strength ◽  
Mechanical Tests ◽  
Curing Process ◽  
Thermomechanical Characteristics ◽  
Low Viscosity ◽  
Operational Characteristics ◽  
Pot Life ◽  
Physical And Chemical

The paper considers the main physical and chemical and thermomechanical characteristics of the VSE-62 epoxy resin. The results of rheological tests of the developed resin in dynamic and isothermal modes, as well as the kinetic parameters of the curing process are presented. They help to determine the technological conditions for obtaining defect-free cured samples. The results of mechanical tests show that this resin’s system is characterized by high values of the glass transition temperature and good mechanical properties at test temperature of 120 °C. The absence of solvents in the composition of the VSE-62 epoxy resin and its low viscosity makes it possible to obtain high-strength materials with reduced porosity.

scholarly journals High-Strength Nanocomposite Hydrogels with Swelling-Resistant and Anti-Dehydration Properties

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1025 ◽  
Author(s):  
Bo Xu ◽  
Yuwei Liu ◽  
Lanlan Wang ◽  
Xiaodong Ge ◽  
Min Fu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
High Strength ◽  
Alumina Nanoparticles ◽  
Cross Linking ◽  
Free Radical Copolymerization ◽  
Application Range ◽  
Practical Applications ◽  
Nanocomposite Hydrogels ◽  
Al2o3 Nps

Hydrogels with excellent mechanical properties have potential for use in various fields. However, the swelling of hydrogels under water and the dehydration of hydrogels in air severely limits the practical applications of high-strength hydrogels due to the influence of air and water on the mechanical performance of hydrogels. In this study, we report on a kind of tough and strong nanocomposite hydrogels (NC-G gels) with both swelling-resistant and anti-dehydration properties via in situ free radical copolymerization of acrylic acid (AA) and N-vinyl-2-pyrrolidone (VP) in the water-glycerol bi-solvent solutions containing small amounts of alumina nanoparticles (Al2O3 NPs) as the inorganic cross-linking agents. The topotactic chelation reactions between Al2O3 NPs and polymer matrix are thought to contribute to the cross-linking structure, outstanding mechanical performance, and swelling-resistant property of NC-G gels, whereas the strong hydrogen bonds between water and glycerol endow them with anti-dehydration capacity. As a result, the NC-G gels could maintain mechanical properties comparable to other as-prepared high-strength hydrogels when utilized both under water and in air environments. Thus, this novel type of hydrogel would considerably enlarge the application range of hydrogel materials.

The energy dissipation and Mullins effect of tough polymer/graphene oxide hybrid nanocomposite hydrogels

2017 ◽  
Vol 8 (32) ◽  
pp. 4659-4672 ◽  
Author(s):  
Ziqing Tang ◽  
Feng Chen ◽  
Qiang Chen ◽  
Lin Zhu ◽  
Xiaoqiang Yan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Dissipation ◽  
High Strength ◽  
Mullins Effect ◽  
Hybrid Nanocomposite ◽  
Nanocomposite Hydrogels ◽  
High Toughness

Polyacrylamide/graphene oxide hybrid NC gels exhibited high strength, high toughness and rapid self-recovery properties.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

Sign in / Sign up

Export Citation Format

Share Document