scholarly journals Impact of epoxy resin modification on their strength parameters

2020 ◽  
Vol 18 (4) ◽  
pp. 041-050
Author(s):  
Andrzej Szewczak
Keyword(s):  
Epoxy Resin ◽  
Sem Analysis ◽  
Crosslinking Reaction ◽  
Inorganic Polymers ◽  
Strength Parameters ◽  
Structural Element ◽  
Element Carbon ◽  
Epoxy Resin Modification ◽  
Solid Form ◽  
Chemical Formulas

Modifications of polymer composites are one of the fastest developing fields of technology. Research is focused on two directions: obtaining new composites or modifying existing materials. The first group of tests uses methods for preparing new chemical formulas of polymers containing, as the main structural element: carbon (organic polymers) or silicon (inorganic polymers). In the second group, the research consists in seeking methods to modify the properties of polymers. In building construction, among the others types, the glues (adhesive polymers) are used. They are exerted to connect materials with different physical andmechanical properties. Under the influence of the factor initiating the crosslinking reaction (hardener or temperature), the polymers obtain a solid form. The strength of the glued joint depends on the initial parameters of the glue resin and the target substrate of its application.The glued surface is usually the weakest element in this connection in terms of the possibility of damage due to the effects of loads, therefore methods to improve the strength parameters of adhesives are sought. The study presents the results of own research on methods of modification of a selected epoxy resin used in the technique as a glue. In order to ensure effective mixing of the adhesive with the fillers, ultrasound energy was used. After the resin had hardened, tests were carried out to determine the hardness and tensile strength of the obtained composites. Based on the results, SEM analysis and observation of the effect of ultrasound, the phenomena affecting the changes in the above mechanical properties were explained.

scholarly journals Pyrolysis of casein, characterization and properties of obtained solid and liquid products

2016 ◽  
Vol 16 ◽  
pp. 5-12 ◽  
Author(s):  
B. Purevsuren ◽  
Ya. Davaajav ◽  
D. Batkhishig
Keyword(s):  
Epoxy Resin ◽  
Elemental Composition ◽  
Heating Temperature ◽  
Epoxy Group ◽  
Mass Range ◽  
Sem Analysis ◽  
Crosslinking Reaction ◽  
Curing Reaction ◽  
Technical Specifications ◽  
Milk Casein

Have been determined the technical characteristics and elemental composition of milk casein. Pyrolysis experiments of casein carried out at different heating temperatures and determined the yields of obtained solid (biochar), liquid (tar and pyrolysis water) and gas products. A temperature around 550ºC determined as an optimal heating temperature of pyrolysis and approximately 28.33% biochar, 37.38% tar, 13.23% pyrolysis water and 20.84% gas obtained after pyrolysis. First time a biochar with higher content of nitrogen was obtained by pyrolysis of casein and determined it is elemental composition and technical specifications. The porous structure of casein biochar was characterized by mercury porosimeter and SEM analysis confirmed that casein biochar has mostly meso and macro pores. The casein tar had the elemental composition: C-66.7%, H-8.3%, N-12.1%, O-12.9% and was completely soluble in 1-methyl-2-pyrroldinone. The tar consisted mostly of moderate molecular mass components with SEC elution times between 18-26 min and an estimated mass range up to 3000-5000 mass units as well as some larger size components, possibly 3-dimentional. The property and determined chemical composition of casein tar by GC/MS analysis were an evidence for using it as a curing agent for crosslinking reactions of epoxy resins. The necessary amount of tar for curing reaction of epoxy resin was determined experimentally as a 15-20% for the stoichiometric amount of reactive epoxy groups (15-20% epoxy group content) in epoxy resin and obtained cured epoxy resin with 95% degree of crosslinking reaction. Have been suggested several curing reaction schemes of epoxy resin with amines, nitriles and phenols of the casein tar

Experimental Investigation on Volume Fraction of Mechanical and Physical Properties of Flax and Bamboo Fibers Reinforced Hybrid Epoxy Composites

2017 ◽  
Vol 25 (3) ◽  
pp. 229-236 ◽  
Author(s):  
S. Sathish ◽  
K. Kumaresan ◽  
L. Prabhu ◽  
N. Vigneshkumar
Keyword(s):  
Physical Properties ◽  
Epoxy Resin ◽  
Volume Fraction ◽  
Hybrid Composites ◽  
Sem Analysis ◽  
Epoxy Composites ◽  
Resin Matrix ◽  
Void Content ◽  
Mechanical And Physical Properties ◽  
Bamboo Fibers

The aim of this paper is to study the effect of volume fraction on mechanical and physical properties such as tensile, flexural, impact, interlaminar shear strength, void content and water absorption of flax and bamboo fibers reinforced hybrid epoxy composites. Flax and bamboo fibers reinforced epoxy resin matrix hybrid composites have been fabricated by compression molding techniques. The hybrid composites were fabricated with different volume fraction of fibers. SEM analysis on the hybrid composite materials was performed to analyze the bonding behavior of materials and internal structure of the fractured surfaces. The effect of chemical treatment of flax and bamboo fibers was verified by FTIR analysis. The results showed that the tensile, impact, flexural and ILSS are maximum for 40:0 (flax: bamboo) hybrid composites. The void content decreased for 20:20 (flax:bamboo) composites due to tightly packed flax fiber and more compatibility towards epoxy resin.

Epoxy resin modification by reactive bio-based furan derivatives: Curing kinetics and mechanical properties

2019 ◽  
Vol 673 ◽  
pp. 147-157 ◽  
Author(s):  
Mohsen Zolghadr ◽  
Mohammad Jalal Zohuriaan-Mehr ◽  
Alireza Shakeri ◽  
Ali Salimi
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Curing Kinetics ◽  
Furan Derivatives ◽  
Epoxy Resin Modification

scholarly journals A Study of Some Mechanical Properties of Composite Materials with a Dammar-Based Hybrid Matrix and Reinforced by Waste Paper

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1688
Author(s):  
Marius Marinel Stănescu ◽  
Dumitru Bolcu
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Epoxy Resin ◽  
Volume Ratio ◽  
Tensile Tests ◽  
Sem Analysis ◽  
Waste Paper ◽  
Hybrid Resin ◽  
Natural Resin ◽  
Tensile Response

When obtaining environment-friendly hybrid resins made of a blend of Dammar natural resin, in a prevailing volume ratio, with epoxy resin, it is challenging to find alternatives for synthetic resins. Composite materials reinforced with waste paper and matrix made of epoxy resin or hybrid resin with a volume ratio of 60%, 70% and 80% Dammar were studied. All samples obtained have been submitted to tensile tests and Scanning Electron Microscopy (SEM) analysis. The tensile response, tensile strength, modulus of elasticity, elongation at break and the analysis of the fracture surface were determined. The damping properties of vibrations of bars in hybrid resins and in the composite materials under study were also examined. The mechanical properties of the four types of resins and of the composite materials were compared. The chemical composition for a hybrid resin specimen were obtained using the Fourier Transformed Infrared Spectroscopy (FTIR) and Energy, Dispersive X-ray Spectrometry (EDS) analyzes.

Development of Environmentally Acceptable Nano-Hybrid Coatings for Bio-Fouling Protection

2014 ◽  
Vol 938 ◽  
pp. 269-274 ◽  
Author(s):  
P. Saravanan ◽  
D. Duraibabu ◽  
S. Ananda Kumar
Keyword(s):  
Epoxy Resin ◽  
Salt Spray ◽  
Diglycidyl Ether ◽  
Sem Analysis ◽  
Hybrid Coatings ◽  
Spectral Studies ◽  
Chemical Polarization ◽  
Lower Toxicity ◽  
Ft Ir ◽  
Polarization Studies

Alternative coatings should be as effective as conventional paints but with lower toxicity. In the present study, a commercially available epoxy resin modified with non functionalized nanozinc oxide (nZnO) was examined to get information on its antifouling and anti-corrosive properties. Epoxy nanohybrid coating was synthesized using nZnO (in the amount of 0wt%, 1wt%, 3wt%, 5wt%, 7wt% and 10wt%) and diglycidyl ether of bisphenol A (DGEBA) type of epoxy resin. The curing behavior of these materials was ascertained from FT-IR spectral studies. The anti-corrosive properties of the nanohybrid were investigated using salt spray and electro chemical polarization studies. The surface morphology images were taken by SEM analysis. This study indicates that nZnO particles were dispersed homogenously through the polymer matrix. The nZnO incorporated coating was found to exhibit enhanced anticorrosive performance. Approximately 50% reduction in fouling attachment was achieved with coatings containing 3wt% of nZnO.

Two-Way Shape Memory Behavior of Electrospun Non-Woven Mats Prepared from Sol-Gel Crosslinked Poly(ε-Caprolactone)

2016 ◽  
Vol 97 ◽  
pp. 100-105 ◽  
Author(s):  
Stefano Pandini ◽  
Silvia Agnelli ◽  
Andrea Merlettini ◽  
Chiara Gualandi ◽  
Maria Letizia Focarete ◽  
...  
Keyword(s):  
Shape Memory ◽  
Microstructural Evolution ◽  
Sol Gel ◽  
Sem Analysis ◽  
Electrospinning Process ◽  
Ex Situ ◽  
Crosslinking Reaction ◽  
Cyclic Response ◽  
Heating And Cooling ◽  
Training Cycle

Non-woven fibrous mats based on semicrystalline networks were prepared starting from poly(ε-caprolactone) and by combining electrospinning process and sol-gel crosslinking reaction. The mats were subjected to proper thermo-mechanical cycles to investigate their two-way shape memory capabilities (i.e. the possibility to change between two distinguished shapes upon heating and cooling), and an improvement of the two-way behaviour was researched through the application of a training cycle. An ex-situ SEM analysis described the microstructural evolution accompanying the two-way shape memory cyclic response.

scholarly journals Evaluation of Root-End Resections Performed by Er, Cr: YSGG Laser with and without Placement of a Root-End Filling Material

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
John Sullivan ◽  
Roberta Pileggi ◽  
Claudio Varella
Keyword(s):  
Methylene Blue ◽  
Epoxy Resin ◽  
Sem Analysis ◽  
The Other ◽  
Filling Material ◽  
Direct Influence ◽  
Ysgg Laser ◽  
Dye Penetration ◽  
Ah Plus ◽  
Imagej Software

Microleakage following root-end resections has a direct influence on the outcome of surgical endodontic procedures. This study compared the microleakage after root-end resections performed by the Er, Cr: YSGG laser or carbide burs with or without the placement of MTA, and evaluated the presence of microcracks and gaps at the interface of GP/MTA and the canal walls. Ninety single-rooted teeth were instrumented, obturated with GP and AH-Plus sealer, and divided into 3 experimental groups: (I) root-end resections were performed with the laser and G6 tips (parameters: 4.5 w, 30 pps, 20% water and 50% air); (II) Lindeman burs were used, without the placement of MTA; (III) the burs were used followed by root-end fillings with MTA, and one control (IV) of five unobturated roots resected with the burs. The samples were prepared for microleakage () and SEM () analysis. They were immersed in 1% methylene blue, decalcified, cleared, and evaluated for dye penetration () with the ImageJ software. Epoxy-resin replicas of the root-ends were analyzed by SEM for gaps () and microcracks. Microleakage results were , , and , for the laser (I), no root-end filling (II), and MTA (III) samples, respectively, (ANOVA ). The laser () and no root-end filling () samples presented gaps. Whereas, none was found in the MTA (ANOVA ). Microcracks were not observed. The MTA group demonstrated statistically less leakage and better adaptation to the canal walls when compared to the other groups. There was no correlation between the size of the gaps and the degree of microleakage.

Study of the kinetic and crosslinking reaction of novolak with epoxy resin

Polymer ◽  
1998 ◽  
Vol 39 (11) ◽  
pp. 2247-2253 ◽  
Author(s):  
M.C. Gualpa ◽  
C.C. Riccardi ◽  
A. Vázquez
Keyword(s):  
Epoxy Resin ◽  
Crosslinking Reaction

scholarly journals STUDY OF THE INFLUENCE OF CONSTITUENT RATIO ON THE CROSSLINKING REACTION OF CASTOR OIL MODIFIED EPOXY RESIN BY 4.4’-DIAMINO DIPHENYLMETHANE

2016 ◽  
Vol 54 (4) ◽  
pp. 501
Author(s):  
Do Minh Thanh ◽  
Le Xuan Hien ◽  
Nguyen Tien Dung
Keyword(s):  
Epoxy Resin ◽  
Castor Oil ◽  
Impact Resistance ◽  
Crosslinking Reaction ◽  
Curing Time ◽  
Optimal Conditions ◽  
Swelling Degree ◽  
Gel Fraction ◽  
Relative Hardness ◽  
Modified Epoxy

The influence of the contents of epoxy resin modified by castor oil (ECO), 4,4’- diamino diphenyl methan (DDM) on the crosslinking reaction of ECO by DDM at 1800C have been studied and the mol ratio of A/E = 1, curing time of 270 min have been determined to be optimal conditions for formation of the cured coating having gel fraction, swelling degree, flexibility, adhesion, impact resistance, and relative hardness of 86%; 188 %; 1 mm, 0 point, 200 kG.cm and 0.33, respectively.

scholarly journals Experimental Investigations on the Properties of Epoxy-Resin-Bonded Cement Concrete Containing Sea Sand for Use in Unreinforced Concrete Applications

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 645 ◽  
Author(s):  
Sakthieswaran Natarajan ◽  
Nagendran Neelakanda Pillai ◽  
Sophia Murugan
Keyword(s):  
Epoxy Resin ◽  
Experimental Studies ◽  
Sem Analysis ◽  
Polymer Concrete ◽  
Experimental Investigations ◽  
Clear Understanding ◽  
Fine Aggregate ◽  
Practical Applications ◽  
Durability Properties ◽  
Sea Sand

This paper deals with the experimental studies conducted on the effects of using sea sand on the properties of polymer concrete modified using epoxy resin. The physical properties including workability, mechanical properties, and durability properties were evaluated as a function of sea-sand substitution. The results obtained behave as strong evidence for the feasibility of using sea sand as fine aggregate to solve the problem associated with the exhaustion of natural aggregates when used in combination with epoxy polymer. A clear understanding of the behavior of polymer concrete with sea sand as aggregate was obtained through some preliminary investigations. The test results showed a significant improvement in the compressive and flexural strength due to the sea-sand substitution in polymer concrete. Resistance to the water intrusion was also improved for the concrete mixes due to the inclusion of epoxy resin. The quality and the integrity of the concrete were also improved,as evident from the SEM analysis and infrared (IR) spectroscopy, and the results function as solid basis for the use of sea-sand polymer-modified concrete for practical applications. Results also show that 15% replacement of fine aggregate by sea sand in air-cured polymer concrete exhibited enhanced strength and durability properties; thus, the produced concrete can be an effective material for unreinforced concrete applications.

Sign in / Sign up

Export Citation Format

Share Document