scholarly journals Bioinspired Engineering towards Tailoring Advanced Lignin/Rubber Elastomers

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1033 ◽  
Author(s):  
Haixu Wang ◽  
Weifeng Liu ◽  
Jinhao Huang ◽  
Dongjie Yang ◽  
Xueqing Qiu
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Value Added ◽  
High Volume ◽  
Enhancement Effect ◽  
Covalent Bonds ◽  
Dynamic Coordination ◽  
Natural Ligands ◽  
Coordination Bonds

The pursuit of high volume and high value-added applications for lignin has been a long-term challenge. In this work, inspired by the energy sacrificial mechanism from biological materials, we developed high-performance lignin/carbon black (CB)/nitrile rubber (NBR) elastomers by constructing a dual-crosslinking network consisting of sulfur covalent bonds and dynamic coordination sacrificial bonds. Lignin was not only used for the substitution of half mass of CB in the NBR elastomer but also served as natural ligands for the Zn-based coordination bonds, providing a significant synergistic coordination enhancement effect. The mechanical performance of the elastomers can be easily manipulated by adjusting the proportion of non-permanent coordination bonds and permanent covalent bonds. Lignin/CB/NBR elastomers with a higher strength and modulus than CB-filled elastomers were obtained while maintaining excellent elasticity. The thermal stability and the high-temperature oil resistance of NBR elastomers were also improved by incorporation of lignin and metal coordination bonds. Overall, this work inspires a new solution for the design of high-performance lignin/rubber elastomers with a high lignin loading content.

Long term mechanical performance of nano-engineered high volume fly ash concrete

2021 ◽  
pp. 103168
Author(s):  
Charith Herath ◽  
Chamila Gunasekara ◽  
David W. Law ◽  
Sujeeva Setunge
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
High Volume ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash

scholarly journals Effects of Sulfate and Sulfuric Acid on Efficiency of Geopolymers as Concrete Repair Materials

Gels ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 53
Author(s):  
Rayed Alyousef ◽  
Ahmed Abdel Khalek Ebid ◽  
Ghasan Fahim Huseien ◽  
Hossein Mohammadhosseini ◽  
Hisham Alabduljabbar ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Bond Strength ◽  
High Performance ◽  
Mechanical Performance ◽  
High Volume ◽  
Industrial Wastes ◽  
Ternary Blend ◽  
Ceramic Tiles ◽  
Strength Performance ◽  
Durability Performance

Various geopolymer mortars (GPMs) as concrete repairing materials have become effective owing to their eco-friendly properties. Geopolymer binders designed from agricultural and industrial wastes display interesting and useful mechanical performance. Based on this fact, this research (experimental) focuses on the feasibility of achieving a new GPM with improved mechanical properties and enhanced durability performance against the aggressive sulfuric acid and sulfate attacks. This new ternary blend of GPMs can be achieved by combining waste ceramic tiles (WCT), fly ash (FA) and ground blast furnace slag (GBFS) with appropriate proportions. These GPMs were designed from a high volume of WCT, FA, and GBFS to repair the damaged concretes existing in the construction sectors. Flexural strength, slant shear bond strength, and compatibility of the obtained GPMs were compared with the base or normal concrete (NC) before and after exposure to the aggressive environments. Tests including flexural four-point loading and thermal expansion coefficient were performed. These GPMs were prepared using a low concentration of alkaline activator solution with increasing levels of GBFS and FA replaced by WCT. The results showed that substitution of GBFS and FA by WCT in the GPMs could enhance their bond strength, mechanical characteristics, and durability performance when exposed to aggressive environments. In addition, with the increase in WCT contents from 50 to 70%, the bond strength performance of the GPMs was considerably enhanced under sulfuric acid and sulfate attack. The achieved GPMs were shown to be highly compatible with the concrete substrate and excellent binders for various civil engineering construction applications. It is affirmed that the proposed GPMs can efficiently be used as high-performance materials to repair damaged concrete surfaces.

Early Age and Long-term Mechanical Performance of Mortars Incorporating High-volume GGBS

2021 ◽  
pp. 267-274
Author(s):  
A. A. Shubbar ◽  
M. S. Nasr ◽  
G. M. Sadiqul Islam ◽  
Z. S. Al-Khafaji ◽  
M. Sadique ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
High Volume ◽  
Early Age

scholarly journals Recycling of Waste Tyre into Silica-Rubber Compounds for Green Tyre Application

2021 ◽  
Author(s):  
Joyeeta Ghosh ◽  
Sakrit Hait ◽  
Soumyajit Ghorai ◽  
Dipankar Mondal ◽  
Gert Heinrich ◽  
...  
Keyword(s):  
High Performance ◽  
Large Scale ◽  
Mechanical Performance ◽  
Value Added ◽  
Styrene Butadiene Rubber ◽  
Scale Production ◽  
Butadiene Rubber ◽  
Rubber Compounds ◽  
Styrene Butadiene ◽  
Devulcanized Rubber

Abstract The prevention of detrimental effects to environment, owing to generation of a huge amount of rubber wastes, is a big challenge across the globe that warrants a thorough investigation of recycling and reuses waste of rubber products. In this spirit a sustainable development of a devulcanization process along with the production of value added devulcanized rubber is a task of hours. The present work describes a simultaneous devulcanization and chemical functionalisation process of waste solution styrene butadiene rubber (S-SBR). This kind of rubber is generally used as the main polymer component in silica filled tread rubber compounds for high-performance passenger car tyres. As-grown ethoxy groups on the functionalized devulcanized styrene butadiene rubber (D-SBR) are exploited for the coupling between silica and the devulcanized rubber chains. We compare the mechanical and dynamic mechanical performance of D-SBR with that of virgin SBR control composites. Covalently bonding interfaces developed from the pendent ethoxy groups of D-SBR and silanol groups on the silica surface offer a competitive and promising performance of the D-SBR based composites. We conclude that the present approach can be further utilized for the large-scale production of different rubber products with satisfied elastomeric performance.

HRM and Contemporary Manufacturing

2009 ◽  
Author(s):  
Rick Delbridge
Keyword(s):  
Lean Manufacturing ◽  
High Performance ◽  
Management Practices ◽  
Value Added ◽  
High Volume ◽  
Manufacturing Sectors ◽  
High Volume Production ◽  
Volume Production ◽  
Incremental Improvement ◽  
High Performance Work System

This article outlines the key elements of organization and HRM associated with contemporary high-volume production, in particular the key arguments and characteristics of lean manufacturing. Lean manufacturing and the associated high-performance work system model has been influential in the development of management practices throughout manufacturing sectors and beyond. However, they are primarily premised on labor efficiencies and incremental improvement. The article reviews the evidence on the implementation and outcomes of lean adoption. The second main section reviews alternatives to ‘lean’. The requirement for innovation and higher value added noted above has meant that a greater emphasis on creating and managing knowledge than that associated with lean manufacturing has become central. One insightful, and increasingly influential, way of conceiving of this challenge has been developed from the concept of ‘communities of practice’, i.e. groups of largely autonomous and self-organizing experts.

1002: Long Term Outcomes for Patients with High Volume Retroperitoneal Teratoma Undergoing Post Chemotherapy Surgery

2007 ◽  
Vol 177 (4S) ◽  
pp. 331-331 ◽  
Author(s):  
Stephen D.W. Beck ◽  
Richard S. Foster ◽  
Richard Bihrle ◽  
John P. Donohue
Keyword(s):  
High Volume ◽  
Long Term Outcomes ◽  
Retroperitoneal Teratoma

23: High Volume Hospitals do not have Better Long Term Outcomes Following Cystectomy for Bladder Cancer

2006 ◽  
Vol 175 (4S) ◽  
pp. 8-9 ◽  
Author(s):  
Brent K. Hollenbeck ◽  
Yongliang Wei ◽  
John D. Birkmeyer
Keyword(s):  
Bladder Cancer ◽  
High Volume ◽  
Long Term Outcomes

Efficient Co-Harvesting of Solar Energy and Low-Grade Heat by Molecular Photoswitches for High Energy Density, Long-Term Stable Solar Thermal Battery

2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI
Keyword(s):  
Energy Density ◽  
Solar Energy ◽  
High Performance ◽  
High Energy ◽  
Solar Thermal ◽  
High Energy Density ◽  
Low Grade ◽  
Thermal Battery ◽  
Low Grade Heat

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.

Efficient Co-Harvesting of Solar Energy and Low-Grade Heat by Molecular Photoswitches for High Energy Density, Long-Term Stable Solar Thermal Battery

2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI
Keyword(s):  
Energy Density ◽  
Solar Energy ◽  
High Performance ◽  
High Energy ◽  
Solar Thermal ◽  
High Energy Density ◽  
Low Grade ◽  
Thermal Battery ◽  
Low Grade Heat

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.

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