scholarly journals A Low-Cost, Portable, and Wireless In-Shoe System Based on a Flexible Porous Graphene Pressure Sensor

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6475
Author(s):  
Tianrui Cui ◽  
Le Yang ◽  
Xiaolin Han ◽  
Jiandong Xu ◽  
Yi Yang ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Low Cost ◽  
The Elderly ◽  
Biological Information ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Application Range ◽  
Porous Graphene ◽  
High Flexibility ◽  
Styrene Butadiene

Monitoring gait patterns in daily life will provide a lot of biological information related to human health. At present, common gait pressure analysis systems, such as pressure platforms and in-shoe systems, adopt rigid sensors and are wired and uncomfortable. In this paper, a biomimetic porous graphene–SBR (styrene-butadiene rubber) pressure sensor (PGSPS) with high flexibility, sensitivity (1.05 kPa−1), and a wide measuring range (0–150 kPa) is designed and integrated into an insole system to collect, process, transmit, and display plantar pressure data for gait analysis in real-time via a smartphone. The system consists of 16 PGSPSs that were used to analyze different gait signals, including walking, running, and jumping, to verify its daily application range. After comparing the test results with a high-precision digital multimeter, the system is proven to be more portable and suitable for daily use, and the accuracy of the waveform meets the judgment requirements. The system can play an important role in monitoring the safety of the elderly, which is very helpful in today’s society with an increasingly aging population. Furthermore, an intelligent gait diagnosis algorithm can be added to realize a smart gait monitoring system.

Identification of glycerol as a novel accelerator for sulphur vulcanization of unsaturated rubbers

2021 ◽  
pp. 009524432110386
Author(s):  
Sambhu Bhadra ◽  
Nitin Mohan ◽  
LNVG Krishna R ◽  
Sujith S Nair
Keyword(s):  
Low Cost ◽  
Environmentally Benign ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Plausible Mechanism ◽  
Additional Improvement ◽  
Chloroprene Rubber ◽  
Sulphur Vulcanization ◽  
Halogen Free ◽  
Styrene Butadiene

Different organic polyols were investigated as accelerators for different type of vulcanization system such as sulphur, metal oxide, peroxide with different rubbers such as natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), butyl rubber (IIR), nitrile rubber (NBR) and chloroprene rubber (CR). Among all the polyols studied, glycerol found to be the most efficient accelerator for sulphur vulcanization of unsaturated rubbers. Moreover, from rheometric study glycerol was found to be reversion free and scorch safe accelerator. A detailed study was performed with glycerol for sulphur vulcanization of silica filled, SBR + BR-based standard passenger car radial (PCR) tire tread compound and plausible mechanism of acceleration was proposed. Finally, from the PCR tyre tread compound 70% of conventional accelerators, namely N-cyclohexyl-2-benzothiazole sulfenamide (CBS) and di-phenyl guanidine (DPG) were replaced with 5 phr (parts per hundred gram of rubber) of glycerol and properties of the vulcanized compounds were measured. The results evidenced that glycerol could efficiently replace 70% conventional accelerators (CBS + DPG), with additional improvement of scorch time by 68%, tensile strength by 31.5%, elongation at break by 75.6% and tear strength by 9.4% of the PCR tyre tread compound. The increase in mechanical properties was due to the improvement in compatibility between silica and rubber in presence of glycerol. Moreover, glycerol is an environmentally benign (nitrogen free, halogen free), fossil free, low-cost material.

Composites of styrene butadiene rubber/modified clay: mechanical, dielectric and morphological properties

2017 ◽  
Vol 46 (3) ◽  
pp. 161-171 ◽  
Author(s):  
Salwa H. El-Sabbagh ◽  
Doaa Samir Mahmoud ◽  
Nivin M. Ahmed ◽  
A.A. Ward ◽  
Magdy Wadid Sabaa
Keyword(s):  
Tensile Strength ◽  
Low Cost ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Gravimetric Analysis ◽  
Scanning Electron Micrographs ◽  
Butadiene Rubber ◽  
Content Type ◽  
Modified Clay ◽  
Styrene Butadiene

Purpose This paper aims to study the role of organobentonite (OB) as a filler to improve the mechanical strength of styrene butadiene rubber (SBR). Organoclay was first prepared by modifying bentonite with different concentrations of N-cetyl-N, N, N-triethyl ammonium bromide. A series of SBR composites reinforced with OB were prepared using master-batch method. Design/methodology/approach The curing characteristics, mechanical properties, thermal behavior, dielectric properties and morphology of SBR/OB composites were investigated. Findings The elastic modulus and tensile strength of composites were increased by inclusion of OB, while the elongation at break was decreased, due to the increase in the degree of cross-linking density. Thermal gravimetric analysis revealed an improvement in the thermal stability of the composite containing 0.5 cation exchange capacity (CEC) OB, while the scanning electron micrographs confirmed more homogenous distribution of 0.5CEC OB in the rubber matrix. Also, SBR/0.5CEC OB showed low relative permittivity and electrical insulating properties. Research limitations/implications Bentonite has been recognized as a potentially useful filler in polymer matrix composites because of their high swelling capacity and plate morphology. Practical implications OB improves the cured rubber by increasing the tensile strength and the stiffness of the vulcanizate. Social implications Using cheap clay in rubber industry lead to production of low cost products with high efficiency. Originality/value The clay represents a convenient source because of their environmental compatibility. The low cost and easy availability make the modified clay used as fillers in rubber matrices, and the resultant composites can be applied in variety industrial of applications such as automobile industries, shoe outsoles, packaging materials and construction engineering.

Modified diatomite forms in the rubber nanocomposites

2018 ◽  
Vol 33 (5) ◽  
pp. 659-672
Author(s):  
Weili Wu ◽  
Songyan Cong
Keyword(s):  
Environmental Protection ◽  
Building Materials ◽  
Chemical Engineering ◽  
Low Cost ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
The Matrix ◽  
Composition Structure ◽  
Styrene Butadiene ◽  
Modified Diatomite

Diatomite is a kind of biomass sedimentary rock, which is widely used in chemical engineering, petroleum, building materials, biomedical medicine, health care and environmental protection, and other fields due to its characteristics of lightweight, large specific surface area, super adsorption, noise and abrasion resistance, thermal properties, and corrosion resistance. The diatomite is similar to silica in the composition structure and can be used as a substitute for silica to reinforce the rubber materials. In this work, the diatomite was modified with different modifiers to fill the rubbers such as natural rubber, styrene–butadiene rubber, butadiene rubber, nitrile butadiene rubber, ethylene propylene diene monomer (EPDM), chloroprene rubber, methyl vinyl silicone rubber, fluorine rubber (FKM), and acrylic rubber (ACM). The results showed that the obtained formula is the most suitable diatomite modifier for various rubber is Si69, and its amount is 2.5 parts per hundred rubber (phr), and the diatomite content is 20 phr. The diatomite is more suitable for FKM, ACM, and EPDM. The diatomite has better reinforced effect on FKM, EPDM, and ACM than silica, and FKM is the most prominent. The modified diatomite can be uniformly dispersed in the matrix of FKM, EPDM, and ACM; the compatibility is good; and the mechanical properties are excellent. It was demonstrated that the modified diatomite with green environmental protection and low cost can replace silica to reinforce and fill the three kinds of rubbers.

Effects of White Rot Fungus Physisporinus sp., Isolated in Japan, on Styrene-butadiene Rubber

2020 ◽  
Vol 93 (9) ◽  
pp. 289-292
Author(s):  
Yumi SHIMIZU ◽  
Shuma SATHO ◽  
Taro NAKAJIMA ◽  
Hiroaki KOUZAI ◽  
Kiminori SHIMIZU
Keyword(s):  
White Rot ◽  
White Rot Fungus ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene
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