scholarly journals Understanding the Coupling Effect between Lignin and Polybutadiene Elastomer

2021 ◽  
Vol 5 (6) ◽  
pp. 154
Author(s):  
Sakrit Hait ◽  
Debapriya De ◽  
Prasenjit Ghosh ◽  
Jagannath Chanda ◽  
Rabindra Mukhopadhyay ◽  
...  
Keyword(s):  
Coupling Agent ◽  
High Performance ◽  
Mechanical Performance ◽  
Coupling Effect ◽  
Cost Effective ◽  
Rubber Matrix ◽  
Rubber Composites ◽  
Renewable Biomass ◽  
Novel Approach ◽  
Polybutadiene Rubber

From an environmental and economic viewpoint, it is a win–win strategy to use materials obtained from renewable resources for the production of high-performance elastomer composites. Lignin, being a renewable biomass, was employed as a functional filler material to obtain an elastomer composite with a higher degree of mechanical performance. In the presence of a suitable coupling agent, an elevated temperature was preferred for the reactive mixing of lignin with polybutadiene rubber (BR). It is quite fascinating that the mechanical performance of this composite was comparable with carbon black-filled composites. The extraordinary reinforcing behavior of lignin in the BR matrix was understood by an available model of rubber reinforcement. In rubber composite preparation, the interfacial interaction between polybutadiene rubber and lignin in the presence of a coupling agent enabled the efficient dispersion of lignin into the rubber matrix, which is responsible for the excellent mechanical properties of the rubber composites. The rubber composites thus obtained may lead to the development of a sustainable and cost-effective end product with reliable performance. This novel approach could be implemented in other type of elastomeric materials, enabling a genuine pathway toward a sustainable globe.

scholarly journals Preparation and Performance ofcis-Polybutadiene Rubber Composite Materials Reinforced by Organic Modified Palygorskite Nanomaterials

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Fei Wang ◽  
Lei Feng ◽  
Qingguo Tang ◽  
Haifeng Liu ◽  
Huimin Liu
Keyword(s):  
Composite Materials ◽  
Coupling Agent ◽  
Mechanical Performance ◽  
Rubber Matrix ◽  
Optimal Dosage ◽  
Polybutadiene Rubber ◽  
Rubber Composite ◽  
Hydrophilic Character ◽  
And Performance ◽  
Modified Palygorskite

The hydrophilic character of palygorskite has been modified by grafting organic group and controlling surface energy for improving compatibility of palygorskite in rubber matrix using palygorskite ascis-polybutadiene rubber fillers. The effects of coupling modification on the performance ofcis-polybutadiene rubber materials filled with palygorskite were investigated, and the influence of coupling agent dosage on their mechanical properties was also studied. The results indicated that the mechanical performance ofcis-polybutadiene rubber materials reinforced by modified palygorskite could be improved significantly, and the tensile strength and tearing strength increased by 122.5% and 107.6% at the optimal dosage (15%) of coupling agent 3-mercaptopropyl trimethoxysilane. Moreover, the reinforcement mechanism of rubber composite materials as prepared was also analyzed.

scholarly journals Functionalized Nanosilica for Vulcanization Efficiency and Mechanical Properties of Natural Rubber Composites

2021 ◽  
Author(s):  
Dileep Padmanabhan ◽  
Sinto Jacob ◽  
C.S. Julie Chandra ◽  
Midhun Dominic C.D ◽  
Poornima M P ◽  
...  
Keyword(s):  
Natural Rubber ◽  
High Performance ◽  
Morphological Analysis ◽  
Mechanical Performance ◽  
Cost Effective ◽  
Rubber Composites ◽  
Profound Influence ◽  
High Performance Polymer ◽  
Natural Rubber Composites ◽  
Cure Time

Abstract Accelerator functional character was introduced on nanosilica by the chemical reaction of sodium isopropyl xanthate (SIPX) with nanosilica (NS). Functional characteristics of nanosilica were confirmed by the Elemental analysis, thermogravimetric analysis, and infrared spectroscopy. This SIPX functionalized nanosilica (SIPX-NS) incorporated natural rubber (NR) compounds were used to evaluate the dispersion of silica in rubber and also the interaction between rubber and filler. The finely dispersed SIPX-NS particles in the NR matrix are revealed from the morphological analysis. Subtle changes in surface chemistry of silica had a profound influence on the dispersibility in NR matrix. NR 4SIPX-NS composite exhibited improved cure time, tensile strength, flex crack resistance and aging resistance relative to those of NR NS composite. This simple, efficient and cost-effective surface modification of silica improved the vulcanization efficiency and mechanical performance of NR composites and has great potential in the fabrication of high-performance polymer composites.

scholarly journals Rivet-Inspired Modification of Aramid Fiber by Decorating with Silica Particles to Enhance the Interfacial Interaction and Mechanical Properties of Rubber Composites

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2665
Author(s):  
Yihang Li ◽  
Yuzhu Xiong ◽  
Qingpo Zhang
Keyword(s):  
Hybrid Materials ◽  
High Performance ◽  
High Surface ◽  
Silica Particles ◽  
Interfacial Interaction ◽  
Aramid Fiber ◽  
Rubber Matrix ◽  
Rubber Composites ◽  
Large Numbers ◽  
Surface Modified

A rivet–inspired method of decorating aramid fiber (AF) with silica particles (SiO2) is proposed to produce SiO2@AF hybrid materials that have largely enhanced interfacial interaction with the rubber matrix. AF was firstly surface-modified with polyacrylic acid (PAA) to obtain PAA–AF, and SiO2 was silanized with 3-aminopropyltriethoxysilane to obtain APES–SiO2. Then, SiO2@AF was prepared by chemically bonding APES–SiO2 onto the surface of PAA–AF in the presence of dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP). With the incorporation of SiO2@AF into the rubber matrix, SiO2@AF hybrid materials with high surface roughness can play a role as ‘rivets’ to immobilize large numbers of rubber chains on the surface. The tear strength and tensile strength of rubber composite that filling 4 phr SiO2@AF are dramatically increased by 97.8% and 89.3% compared to pure rubber, respectively. Furthermore, SiO2@AF has superiority in enhancing the cutting resistance of rubber composites, in contrast with unmodified AF and SiO2. SiO2@AF is suitable to be applied as a novel reinforcing filler in rubber composites for high performance.

scholarly journals Thermal and Reliability Characterization of an Epoxy Resin-Based Double-Side Cooled Power Module

2021 ◽  
Vol 18 (3) ◽  
pp. 123-136
Author(s):  
Tzu-Hsuan Cheng ◽  
Kenji Nishiguchi ◽  
Yoshi Fukawa ◽  
B. Jayant Baliga ◽  
Subhashish Bhattacharya ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
High Power ◽  
High Performance ◽  
Mechanical Performance ◽  
Resin Composite ◽  
Wide Band ◽  
Cost Effective ◽  
Power Module ◽  
Wide Band Gap ◽  
Epoxy Resin Composite

Abstract Wide-Band Gap (WBG) power devices have become a promising option for high-power applications due to the superior material properties over traditional Silicon. To not limit WBG devices’ mother nature, a rugged and high-performance power device packaging solution is necessary. This study proposes a Double-Side Cooled (DSC) 1.2 kV half-bridge power module having dual epoxy resin insulated metal substrate (eIMS) for solving convectional power module challenges and providing a cost-effective solution. The thermal performance outperforms traditional Alumina (Al2O3) Direct Bonded Copper (DBC) DSC power module due to moderate thermal conductivity (10 W/mK) and thin (120 mm) epoxy resin composite dielectric working as the IMS insulation layer. This novel organic dielectric can withstand high voltage (5 kVAC @ 120 μm) and has a Glass Transition Temperature (Tg) of 300°C, which is suitable for high-power applications. In the thermal-mechanical modeling, the organic DSC power module can pass the thermal cycling test over 1,000 cycles by optimizing the mechanical properties of the encapsulant material. In conclusion, this article not only proposes a competitive organic-based power module but also a methodology of evaluation for thermal and mechanical performance.

scholarly journals EMERGING ADVANCES IN RUBBER TECHNOLOGY BY THE SUITABLE APPLICATION OF SOL-GEL SCIENCE AND TECHNOLOGY

2021 ◽  
Author(s):  
Kumarjyoti Roy ◽  
Subhas Chandra Debnath ◽  
Debdipta Basu ◽  
Aphiwat Pongwisuthiruchte ◽  
Pranut Potiyaraj
Keyword(s):  
High Performance ◽  
Recent Progress ◽  
Sol Gel ◽  
Rubber Matrix ◽  
Mechanical And Thermal Properties ◽  
Rubber Composites ◽  
Rubber Compounds ◽  
Polymer Research ◽  
Rubber Nanocomposites ◽  
Synthesized Materials

ABSTRACT In recent years, the application of sol-gel science to industrial polymer research has offered advancements in rubber technology. The use of sol-gel–synthesized materials for the development of highly reinforced rubber composites is the most commonly adopted and popular method exercised by rubber scientists. This article comprehensively reviews the recent progress regarding preparation and properties of sol-gel–synthesized nanoparticles-based rubber composites. The pragmatic consequences of sol-gel–synthesized nanoparticles in rubber compounds are systematically described through rheological, mechanical, and thermal properties. Emphatic focus is given to understanding the reinforcement mechanism of rubber composites by the use of sol-gel–derived alkoxide silica as filler. The properties of rubber nanocomposites are usually dependent on the dispersion of sol-gel–synthesized nanoparticles into the rubber matrix. The results reviewed from prolific studies suggested that sol-gel science has tremendous potential to develop high performance rubber nanocomposites for future industrial application.

scholarly journals Surface Modification of Staple Carbon Fiber by Dopamine to Reinforce Natural Latex Composite

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 988
Author(s):  
Xiaolong Tian ◽  
Shuang Han ◽  
Qianxiao Zhuang ◽  
Huiguang Bian ◽  
Shaoming Li ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
High Performance ◽  
Dynamic Mechanical Properties ◽  
Rubber Matrix ◽  
National Defense ◽  
Rubber Composites ◽  
Rubber Composite ◽  
Thermal And Electrical Properties ◽  
Surface Modified ◽  
Poor Adhesion

Carbon fiber significantly enhances the mechanical, thermal and electrical properties of rubber composites, which are widely used in aerospace, military, national defense and other cutting-edge fields. The preparation of a high-performance carbon fiber rubber composite has been a research hotspot, because the surface of carbon fiber is smooth, reactive inert and has a poor adhesion with rubber. In this paper, a high-performance rubber composite is prepared by mixing dopamine-modified staple carbon fiber with natural latex, and the mechanisms of modified carbon fiber-reinforced natural latex composite are explored. The experimental results show that the surface-modified staple carbon fiber forms uniform and widely covered polydopamine coatings, which significantly improve the interface adhesion between the carbon fiber and the rubber matrix. Meanwhile, when the concentration of dopamine is 1.5 g/L and the staple carbon fiber is modified for 6h, the carbon fiber rubber composite shows excellent conductivity, thermal conductivity, and dynamic mechanical properties, and its tensile strength is 10.6% higher than that of the unmodified sample.

scholarly journals Hydroxymethylation-Modified Lignin and Its Effectiveness as a Filler in Rubber Composites

Processes ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 315 ◽  
Author(s):  
Nor Mohamad Aini ◽  
Nadras Othman ◽  
M. Hussin ◽  
Kannika Sahakaro ◽  
Nabil Hayeemasae
Keyword(s):  
Mechanical Properties ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Kraft Lignin ◽  
Rubber Matrix ◽  
Rubber Composites ◽  
Rubber Industry ◽  
Compression Set ◽  
Polybutadiene Rubber ◽  
Modified Lignin

Kraft lignin was modified by using hydroxymethylation to enhance the compatibility between rubber based on a blend of natural rubber/polybutadiene rubber (NR/BR) and lignin. To confirm this modification, the resultant hydroxymethylated kraft lignin (HMKL) was characterized using Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. It was then incorporated into rubber composites and compared with unmodified rubber. All rubber composites were investigated in terms of rheology, mechanical properties, aging, thermal properties, and morphology. The results show that the HMKL influenced the mechanical properties (tensile properties, hardness, and compression set) of NR/BR composites compared to unmodified lignin. Further evidence also revealed better dispersion and good interaction between the HMKL and the rubber matrix. Based on its performance in NR/BR composites, hydroxymethylated lignin can be used as a filler in the rubber industry.

scholarly journals Nitrogen-Doped Hierarchical Meso/Microporous Carbon from Bamboo Fungus for Symmetric Supercapacitor Applications

Molecules ◽  
2019 ◽  
Vol 24 (20) ◽  
pp. 3677 ◽  
Author(s):  
Zhanghua Zou ◽  
Yu Lei ◽  
Yingming Li ◽  
Yanhua Zhang ◽  
Wei Xiao
Keyword(s):  
High Performance ◽  
High Current Density ◽  
Rate Capability ◽  
Cost Effective ◽  
Maximum Energy ◽  
Electrode System ◽  
Microporous Carbon ◽  
Nitrogen Doped ◽  
Renewable Biomass ◽  
Symmetric Supercapacitor

We report the synthesis of nitrogen-doped hierarchical meso/microporous carbon using renewable biomass bamboo fungus as precursor via two-step pyrolysis processes. It is found that the developed porous carbon (NHPC-800) features honeycomb-like cellular framework with well-developed porosity, huge specific surface area (1708 m2 g−1), appropriate nitrogen-doping level (3.2 at.%) and high mesopore percentage (25.5%), which are responsible for its remarkable supercapacitive performances. Electrochemical tests suggest that the NHPC-800 electrode offers the largest specific capacitance of 228 F g−1, asplendid rate capability and stable electrochemical behaviors in a traditional three-electrode system. Additionally, asymmetric supercapacitor device is built based on this product as well. An individual as-assembled supercapacitor of NHPC-800//NHPC-800 delivers the maximum energy density of 4.3 Wh kg−1; retains the majority of capacitanceat large current densities; and shows terrific cycling durability with negligible capacitance drop after long-term charge/discharge for beyond 10,000 cycles even at a high current density of 10 A g−1. These excellent supercapacitive properties of NHPC-800 in both three- and two-electrode setups outperform those of lots of biomass-derived porous carbons and thus make it a perspective candidate for producing cost-effective and high-performance supercapacitors

scholarly journals Effect of Modified Sepiolite Nanofibers on Properties ofcis-Polybutadiene Rubber Composite Nanomaterials

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Fei Wang ◽  
Lei Feng ◽  
Qingguo Tang ◽  
Jinsheng Liang ◽  
Haifeng Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
Rubber Matrix ◽  
Composite Nanomaterials ◽  
Polybutadiene Rubber ◽  
Rubber Composite ◽  
Hydrophilic Character ◽  
The Relationship ◽  
Sepiolite Nanofibers ◽  
Tearing Strength

In order to use sepiolite nanofibers ascis-polybutadiene rubber fillers, the hydrophilic character of sepiolite nanofibers should be modified by grafting organic group and controlling surface free energy for improving compatibility of sepiolite nanofibers in rubber matrix. The relationship between the performance of thecis-polybutadiene rubber filled with sepiolite and the coupling modification was investigated, and the influence of coupling agentγ-(2,3-epoxypropoxy)propyltrimethoxysilane dosage on mechanical properties ofcis-polybutadiene rubber materials was also studied. The results showed that the mechanical properties could be improved obviously after reinforcement by modified sepiolite nanofibers. The optimum dosage of coupling agentγ-(2,3-epoxypropoxy)propyltrimethoxysilane was 7%, and the tensile strength and tearing strength increased by 108.3% and 74.1%, respectively. On this basis, the reinforcement mechanism of the composite rubber materials was also discussed.

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