scholarly journals Mechanical and thermal characterization of tungsten particulate reinforced epoxy polymer composites

2021 ◽  
Author(s):  
Jenson Joseph. E ◽  
◽  
Kiran A.K ◽  
Panneerselvam K ◽  
◽  
...  
Keyword(s):  
Flexural Strength ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Thermal Characterization ◽  
Industrial Applications ◽  
Tungsten Particle ◽  
Mechanical And Thermal Properties ◽  
Matrix Composites ◽  
Scanning Calorimetry ◽  
Wide Range

Polymer matrix composites find a wide range of industrial applications due to its unique properties like lightweight, improved strength and the properties could also be tailored to suit specific applications. In this present work, a new class of polymer matrix composites with epoxy resin as matrix and tungsten metal particles as fillers were developed. The influence of the addition of tungsten fillers on mechanical and thermal properties of the composites has been investigated. The composites are fabricated by hand lay-up method and the specimens containing tungsten particle content by 1%, 3%, 5%, 7% and 9% by weight were developed. The developed specimens were subjected to mechanical and thermal investigations. Mechanical behavior was analyzed by conducting a flexural test and hardness as per ASTM standards. Thermal behavior was analyzed by conducting Thermogravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) of the developed composites. The results show that the addition of 7 wt. % filler has a higher value of flexural strength and hardness. Further addition of particulate fillers deteriorates the flexural strength and hardness due to agglomeration of filler content in the epoxy. Analysis by TGA and DSC shows that the thermal stability of composites is improved by increasing the addition of tungsten content in the epox.

Effects of the Mould Pressure and Mould Pressing Time on the Properties of Graphite/Phenolic Resin Composites

2013 ◽  
Vol 706-708 ◽  
pp. 95-98
Author(s):  
Mi Dan Li ◽  
Dong Mei Liu ◽  
Lu Lu Feng ◽  
Huan Niu ◽  
Yao Lu
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Flexural Strength ◽  
Polymer Matrix ◽  
Phenolic Resin ◽  
Polymer Matrix Composites ◽  
Resin Composites ◽  
Matrix Composites ◽  
Natural Graphite ◽  
Pressing Time

Polymer matrix composites made from phenolic resin are filled with natural graphite powders. They are fabricated by compression molding technique. The density, electrical conductivity and flexural strength of composite are analyzed to determine the influences of mould pressure and mould pressing time on the physical, electrical and mechanical properties of composite. It is found that the density, electrical conductivity and flexural strength of composites increased with increasing mould pressure. Under pressure of 40 MPa for 60 min, the density, electrical conductivity and flexural strength of composites were 1.85 g/cm3, 4.35  103 S/cm and 70 MPa, respectively. The decreased gaps could be the main reason for the increasing of density, electrical conductivity and flexural strength as mould pressure increases. The results also show that the density of composites increased with increasing mould pressing time.

scholarly journals Bio-Based Polyurethane Resins Derived from Tannin: Source, Synthesis, Characterisation, and Application

Forests ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1516
Author(s):  
Manggar Arum Aristri ◽  
Muhammad Adly Rahandi Lubis ◽  
Apri Heri Iswanto ◽  
Widya Fatriasari ◽  
Rita Kartika Sari ◽  
...  
Keyword(s):  
Natural Resources ◽  
Value Added ◽  
Gel Permeation Chromatography ◽  
Industrial Applications ◽  
Hot Water ◽  
Synthesis Process ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Protective Function ◽  
Wide Range

Tannins are soluble, astringent secondary phenolic metabolites generally obtained from renewable natural resources, and can be found in many plant parts, such as fruits, stems, leaves, seeds, roots, buds, and tree barks, where they have a protective function against bacterial, fungal, and insect attacks. In general, tannins can be extracted using hot water or organic solvents from the bark, leaves, and stems of plants. Industrially, tannins are applied to produce adhesives, wood coatings, and other applications in the wood and polymer industries. In addition, tannins can also be used as a renewable and environmentally friendly material to manufacture bio-based polyurethanes (bio-PUs) to reduce or eliminate the toxicity of isocyanates used in their manufacture. Tannin-based bio-PUs can improve the mechanical and thermal properties of polymers used in the automotive, wood, and construction industries. The various uses of tannins need to be put into perspective with regards to possible further advances and future potential for value-added applications. Tannins are employed in a wide range of industrial applications, including the production of leather and wood adhesives, accounting for almost 90% of the global commercial tannin output. The shortage of natural resources, as well as the growing environmental concerns related to the reduction of harmful emissions of formaldehyde or isocyanates used in the production of polyurethanes, have driven the industrial and academic interest towards the development of tannin-based bio-PUs as sustainable alternative materials with satisfactory characteristics. The aim of the present review is to comprehensively summarize the current state of research in the field of development, characterization, and application of tannin-derived, bio-based polyurethane resins. The successful synthesis process of the tannin-based bio-PUs was characterized by Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), MALDI-TOF mass spectrometry, and gel permeation chromatography (GPC) analyses.

Practical Aspects of Micromechanics Based Simulation of Polymer Matrix Composites

2015 ◽  
Vol 812 ◽  
pp. 425-433
Author(s):  
Zoltan Major ◽  
Martin Reiter ◽  
Michael Jerabek
Keyword(s):  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Practical Importance ◽  
Mean Field ◽  
Industrial Applications ◽  
Matrix Composites ◽  
Material Development ◽  
Practical Engineering ◽  
Homogenization Methods ◽  
Micro Structures

As particle filled and fiber reinforced polymer matrix composites are frequently used in many demanding industrial applications, the proper prediction of the deformation behavior of these materials is of high practical importance for a reliable product design. To predict the thermo-mechanical behavior, micromechanics based simulations were performed using both the mean field homogenization methods (MFH) and full-scale finite element (FS-FE simulations on a material specific representative volume. The applicability and limitations of both methods are introduced based on five different practical examples. Both thermoplastic polymers and elastomers were used as matrix materials with combination of fillers made from different materials having different aspect ratio and revealing a wide variation of alignments and arrangements. While conventionally the behavior of composites revealing processing induced microstructure is predicted for practical engineering applications, novel artificial micro-structures revealing special functionalities might also be designed and their behavior predicted for supporting material development efforts.

Thermal characterization of polymer matrix composites containing microencapsulated paraffin in solid or liquid state

2014 ◽  
Vol 78 ◽  
pp. 796-804 ◽  
Author(s):  
Sana Sari-Bey ◽  
Magali Fois ◽  
Igor Krupa ◽  
Laurent Ibos ◽  
Boumédiène Benyoucef ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Liquid State ◽  
Polymer Matrix Composites ◽  
Thermal Characterization ◽  
Matrix Composites

Genetic Algorithm Based Optimization of ECDM Process for Polymer Matrix Composite

2018 ◽  
Vol 928 ◽  
pp. 144-149 ◽  
Author(s):  
Parvesh Antil ◽  
Sarbjit Singh ◽  
Alakesh Manna
Keyword(s):  
Genetic Algorithm ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Removal Rate ◽  
Research Work ◽  
Industrial Applications ◽  
Regression Equations ◽  
Matrix Composites ◽  
Micro Drilling ◽  
Hard And Brittle Materials

The acceptability of polymer matrix composites for various industrial applications has been increased over the years due to their better mechanical properties. However, nonconductive nature and fibrous residuals produced during micro drilling of these materials has become major challenge for the research fraternity. The conventional machining of these materials causes high tool wear due to presence of abrasive particles. Recently, the electrochemical discharge machining (ECDM) process has emerged as potential contender for the machining of nonconductive hard and brittle materials. Keeping in mind all these challenges, the present research work focuses on micro drilling of PMCs using ECDM process. The experimentation was planned as per Taguchi’s methodology using L9 orthogonal array. Voltage, electrolyte concentration and duty factor were considered as process parameters whereas material removal rate and taper were observed as output quality characteristics. The regression equation and coefficients were obtained using regression analysis. Using this regression equations, further solutions were obtained by genetic algorithm.

Polymer matrix composites and technology

2011 ◽  
Author(s):  
Ru-Min Wang ◽  
Shui-Rong Zheng ◽  
Ya-Ping Zheng
Keyword(s):  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Matrix Composites
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