Physical, chemical, thermal, and mechanical assessments of Roselle-reinforced composites

2012 ◽  
Vol 32 (2) ◽  
Author(s):  
Ashish Chauhan ◽  
Balbir Singh
Keyword(s):  
Mechanical Strength ◽  
Moisture Absorption ◽  
Chemical Resistance ◽  
Phenol Formaldehyde ◽  
Graft Copolymers ◽  
Young Modulus ◽  
Hibiscus Sabdariffa ◽  
Reinforced Composites ◽  
High Mechanical Strength ◽  
Physicochemical Changes

Abstract Hibiscus sabdariffa stem fiber has 73.9% cellulose, high mechanical strength and is found in abundance throughout the world. Hibiscus sabdariffa graft copolymers were synthesized, characterized by FTIR, XRD, TGA, DTA, and SEM techniques, and evaluated for physicochemical changes in properties such as moisture absorption, chemical resistance against 1 n NaOH and 1 n HCl. These graft copolymers were reinforced in phenol-formaldehyde polymer matrix to form biocomposites that were characterized by advanced techniques and evaluated for physicochemicothermal resistance. The mechanical strength was accessed on the basis of hardness, flexural strength, Young modulus, and stress at the limit of proportionality, which was found to be high. These novel materials could have numerous scientific and industrial application to pave the way for development of technology.

scholarly journals Evaluation of Dynamic Materials Procured from Waste Biomass

2011 ◽  
Vol 2011 ◽  
pp. 1-7
Author(s):  
Ashish Chauhan ◽  
Balbir Kaith
Keyword(s):  
Moisture Absorption ◽  
Chemical Resistance ◽  
Phenol Formaldehyde ◽  
Graft Copolymers ◽  
Ethyl Acrylate ◽  
Industrial Applications ◽  
Modulus Of Rupture ◽  
Waste Biomass ◽  
Dynamic Materials ◽  
Physico Chemical

Methyl acrylate (MA) monomer was graft copolymerized onto Hibiscus sabdariffa stem fiber and used to explore the additive effect of vinyl acrylate (VA) and ethyl acrylate (EA) on percentage grafting and the properties of the fiber, in binary vinyl monomeric mixtures. The graft copolymers were reinforced into phenol-formaldehyde polymer matrix to form biocomposites and characterized by FTIR, XRD, TGA, DTA, and SEM techniques. They were evaluated for physico-chemical changes in properties like moisture absorption at different relative humidity levels and chemical resistance against 1 N NaOH and 1 N HCl. These graft copolymers-reinforced biocomposites had higher mechanical strength like hardness, modulus of rupture, modulus of elasticity, and stress at the limit of proportionality. These novel materials can have numerous scientific and industrial applications for the development of technology.

scholarly journals Accreditation of Novel Roselle Grafted Fiber Reinforced Bio-Composites

2012 ◽  
Vol 7 (2) ◽  
pp. 155892501200700 ◽  
Author(s):  
Ashish Chauhan ◽  
Balbir Kaith
Keyword(s):  
Moisture Absorption ◽  
Elasticity Modulus ◽  
Phenol Formaldehyde ◽  
Crystallinity Index ◽  
Modulus Of Rupture ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Morphological Transformation ◽  
Physico Chemical ◽  
Uptake Studies

The reaction parameters for the graft co-polymerization of efficient Butyl acrylate (BA) monomer onto Hibiscus sabdariffa (Roselle) stem fiber were optimized and used to further explore the additive effect of methyl acrylate (MA), vinyl acetate (VA) and styrene (Sty) on percentage grafting, properties and the behavior of the fiber, in binary vinyl monomeric mixtures. The graft co-polymers were characterized by XRD, TGA, DTA, SEM and FTIR techniques and evaluated for physico-chemical changes like moisture absorption, swelling behavior, dye uptake studies and chemical resistance against 1N NaOH and 1N HCl. With increase in percentage grafting the percentage crystallinity, crystallinity index, and hydrophylicity were reduced whereas there was an increase in physico-chemico-thermal resistance, hydrophobicity, miscibility with organic solvents as a result of morphological transformation in these fibers. These modified graft copolymers were then used as reinforcement in phenol-formaldehyde polymer matrix as reinforcement and evaluated mechanically for modulus of elasticity, modulus of rupture, stress at the limit of proportionality and hardness. The composites reinforced with grafted fiber had better strength than raw fiber reinforced composites and phenoplast.

Mechanical Properties of Additive Manufactured Complex Matrix Three-Component Carbon Fiber Reinforced Composites

2016 ◽  
Vol 712 ◽  
pp. 232-236
Author(s):  
Andrey V. Chumaevskii ◽  
Evgeny A. Kolubaev ◽  
Sergei Yu. Tarasov ◽  
Alexander A. Eliseev
Keyword(s):  
Carbon Fiber ◽  
Mechanical Strength ◽  
Carbon Fibers ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Compression Tests ◽  
High Mechanical Strength ◽  
Carbon Fiber Reinforced Composites ◽  
Carbon Fiber Reinforced

Mechanical strength of carbon fiber reinforced composites made of thermoplastic-thermosetting polymer matrix reinforced by carbon fibers has been determined. High mechanical strength has been revealed in tensile and compression tests both along and across the fibers. Specificity of fracturing in fiber-thermoplastics-thermosetting composition has been revealed. The effect of fiber bundling type on fracturing has been addressed.

scholarly journals Synthesis, Characterization and Evaluation of the Transformations in Hibiscus sabdariffa-graft-poly(butyl acrylate)

2008 ◽  
Vol 5 (s1) ◽  
pp. S980-S986 ◽  
Author(s):  
B. S. Kaith ◽  
Aashish Chauhan
Keyword(s):  
Thermal Resistance ◽  
Butyl Acrylate ◽  
Moisture Absorption ◽  
Graft Copolymerization ◽  
Graft Copolymers ◽  
Crystallinity Index ◽  
Hibiscus Sabdariffa ◽  
Reaction Parameters ◽  
Chemical Changes

Different reaction parameters for the graft copolymerization of butyl acrylate ontoHibiscus sabdariffafiber were optimized. Graft copolymers thus obtained were subjected to characterization using XRD, TGA, DTA, SEM and FTIR techniques and were evaluated for physio-chemical changes in the behavior. The percentage crystallinity and crystallinity index were found to decrease with increase in grafting while there was reduction in moisture absorption and increase in chemical, thermal resistance of the graft copolymers.

Polyurea – The New Generation of Lining and Coating

2010 ◽  
Vol 95 ◽  
pp. 85-86 ◽  
Author(s):  
Eitan Zur
Keyword(s):  
Mechanical Strength ◽  
Chemical Resistance ◽  
Wastewater Treatment Plants ◽  
New Technology ◽  
Setting Time ◽  
Hydrolytic Stability ◽  
Moisture Sensitivity ◽  
High Mechanical Strength ◽  
The World ◽  
New Generation

Few seconds setting time, superior flexibility along with high mechanical strength and moisture insensitivity are only a small portion of the characteristics of the unique technology named Polyurea. This technology is on the move around the globe and recently some intriguing projects were done also in Israel. This paper is a brief introduction of the Polyurea technology. Nearly two decades ago, a new technology was introduced to the world. It was not an innovative semi-flexible Epoxy, with a better UV stability. Nor was it a new kind of fast set Urethane, with improved chemical resistance. Rather, it was a new generation of polymers, which is free of some of the drawbacks of the old conventional coatings. It is well known, for example, that epoxies excels in chemical resistance, high mechanical strength and hardness. However, it is also known that in spite of the great advance of recent years, epoxies still tend to be brittle and crack due to thermal stress and other causes. Chalking and yellowing caused by UV exposure is another notorious characteristic of Epoxies. Urethanes on the other hand are very flexible and have excellent weatherabilty. But what about hydrolytic stability, moisture sensitivity during the application and chemical resistance issues? There is much room for improvement on this regard. Polyurea combines high mechanical strength, unusual elongation, excellent water resistance and good chemical resistance. UV stability of some Polyureas is nothing less than high quality aliphatic urethanes. Therefore, in recent years the Polyurea technology is on the move all over the world in diverse fields, such as the building, petrochemical and chemical industries, corrosion protection, flooring, water systems and wastewater treatment plants, bridges and tunnels, etc.

Fabrication of tough epoxy with shape memory effects by UV-assisted direct-ink write printing

Soft Matter ◽  
2018 ◽  
Vol 14 (10) ◽  
pp. 1879-1886 ◽  
Author(s):  
Kaijuan Chen ◽  
Xiao Kuang ◽  
Vincent Li ◽  
Guozheng Kang ◽  
H. Jerry Qi
Keyword(s):  
Thermal Stability ◽  
3D Printing ◽  
Mechanical Strength ◽  
Shape Memory ◽  
Chemical Resistance ◽  
Shape Memory Polymers ◽  
Excellent Thermal Stability ◽  
High Mechanical Strength ◽  
Practical Applications ◽  
Shape Memory Effects

3D printing of epoxy-based shape memory polymers with high mechanical strength, excellent thermal stability and chemical resistance is highly desirable for practical applications.

DMV 59

Alloy Digest ◽  
2009 ◽  
Vol 58 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract DMV 59 is the material of choice for a wide variety of applications where significant corrosion resistance and high mechanical strength is necessary. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-672. Producer or source: Mannesmann DMV Stainless USA Inc.

BOFORS 2RM2

Alloy Digest ◽  
1965 ◽  
Vol 14 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Low Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Cast Steel ◽  
Heat Treating ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract BOFORS 2RM2 is a hardenable stainless cast steel having good weldability, high mechanical strength and improved corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: SS-169. Producer or source: Aktiebolaget Bofors.

scholarly journals Dynamic Nanohybrid-Polysaccharide Hydrogels for Soft Wearable Strain Sensing

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3574
Author(s):  
Pejman Heidarian ◽  
Hossein Yousefi ◽  
Akif Kaynak ◽  
Mariana Paulino ◽  
Saleh Gharaie ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Strain Sensors ◽  
Self Healing ◽  
Nano Materials ◽  
Strain Sensing ◽  
Ferric Ions ◽  
Research Activity ◽  
Adhesion Properties ◽  
High Mechanical Strength ◽  
The Moment

Electroconductive hydrogels with stimuli-free self-healing and self-recovery (SELF) properties and high mechanical strength for wearable strain sensors is an area of intensive research activity at the moment. Most electroconductive hydrogels, however, consist of static bonds for mechanical strength and dynamic bonds for SELF performance, presenting a challenge to improve both properties into one single hydrogel. An alternative strategy to successfully incorporate both properties into one system is via the use of stiff or rigid, yet dynamic nano-materials. In this work, a nano-hybrid modifier derived from nano-chitin coated with ferric ions and tannic acid (TA/Fe@ChNFs) is blended into a starch/polyvinyl alcohol/polyacrylic acid (St/PVA/PAA) hydrogel. It is hypothesized that the TA/Fe@ChNFs nanohybrid imparts both mechanical strength and stimuli-free SELF properties to the hydrogel via dynamic catecholato-metal coordination bonds. Additionally, the catechol groups of TA provide mussel-inspired adhesion properties to the hydrogel. Due to its electroconductivity, toughness, stimuli-free SELF properties, and self-adhesiveness, a prototype soft wearable strain sensor is created using this hydrogel and subsequently tested.

Sign in / Sign up

Export Citation Format

Share Document