scholarly journals Modification of epoxy resin: a comparison of different types of elastomer

2005 ◽  
Vol 24 (3) ◽  
pp. 387-394 ◽  
Author(s):  
Valéria D. Ramos ◽  
Helson M. da Costa ◽  
Vera L.P. Soares ◽  
Regina S.V. Nascimento
Keyword(s):  
Epoxy Resin ◽  
Different Types

Linear elastic characteristics of a cast epoxy resin

1973 ◽  
Vol 8 (2) ◽  
pp. 132-133 ◽  
Author(s):  
R M Ogorkiewicz
Keyword(s):  
Epoxy Resin ◽  
Short Term ◽  
Linear Elastic ◽  
Small Strains ◽  
Different Types ◽  
Elastic Characteristics

Behaviour under different types of short-term loading of specimens cast from an epoxy resin shows that in the realm of small strains its deformational characteristics can be regarded as linear elastic.

scholarly journals Thermal Study of Anhydrides Cured Tetrafunctional Cardo Epoxy Resin

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Jignesh P. Patel ◽  
Parsotam H. Parsania
Keyword(s):  
Thermal Properties ◽  
Maleic Anhydride ◽  
Epoxy Resin ◽  
Degradation Kinetics ◽  
Frequency Factor ◽  
Entropy Change ◽  
Thermal Study ◽  
Gel Time ◽  
Degradation Reactions ◽  
Different Types

Tetrafunctional cardo epoxy resin (EBCF) was cured by using 10 wt% maleic anhydride (MA), pyromellitic dianhydride (PMDA), phthalic anhydride (PA), tetrahydrophthalic anhydride (THPA), tetrabromophthalic anhydride (TBPA), and tetrachlorophthalic anhydride (TCPA) as hardeners at 120°C for 40–105 min (gel time) and then postcured 1 h at 130°C. Gel time is found to depend on the structure of the anhydrides used. Cured samples were found insoluble in common solvents. Cured and uncured EBCF were characterized by FTIR, DSC, and TGA techniques. Cured and uncured resins followed multistep degradation reactions. Kinetic parameters, namely, order of degradation, energy of activation, frequency factor, and entropy change, were determined according to the Anderson-Freeman method and interpreted in light of the nature of hardeners used for curing purpose. The resins followed integral or fractional order degradation kinetics. Complex degradation reactions are due to different types of linkages in cured resins. Both nature and structure of resin and hardeners affected the curing behavior and the resultant thermal properties of the cured resins.

scholarly journals MECHANICAL CHARACTERISTICS FOR COMPOSITE MATERIALS USING COMMERCIAL EPOXY RESINS AND DIFFERENT FILLERS

2021 ◽  
Vol 56 (5) ◽  
pp. 179-185
Author(s):  
Omar A. Amin ◽  
S. A. Hassan ◽  
M. A. Sadek ◽  
M. A. Radwan ◽  
Hany A. Elazab
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Three Dimensional ◽  
Mechanical Tests ◽  
Diglycidyl Ether ◽  
Dimensional Structure ◽  
Polymeric Chain ◽  
Hydroxyl Groups ◽  
Different Types

Epoxy resins are thermoset polymers that consist of epoxide groups in their molecular structure. It shows many attractive characteristics like strong adhesion, excellent mechanical strength, low shrinkage, excellent insulator, excellent chemical stability for acidic and basic environments, and microbial resistance due to the presence of hydroxyl groups and ether bonds and its three-dimensional structure. Many of these characteristics can be modified by adding strong bindings in the polymeric chain to give more improved characteristics. This research aims to prepare a composite material using epoxy resin and different types of fillers to achieve resistance to high kinetic energy impact. Experimental work is focused on preparing cured epoxy resin samples by using diglycidyl ether of bisphenol A (DGEBA) resin with tertiary amine as a hardener. In order to obtain different samples with different properties, we add different types of fillers, then mechanical tests are used to measure the mechanical properties of the samples. The results have proved that fiberglass is the best filler added to epoxy resins to improve its mechanical properties.

scholarly journals SOME OBSERVATIONS ON THE NUCLEAR ENVELOPE

1960 ◽  
Vol 8 (1) ◽  
pp. 233-245 ◽  
Author(s):  
W. Gordon Whaley ◽  
Hilton H. Mollenhauer ◽  
James H. Leech
Keyword(s):  
Electron Microscope ◽  
Nuclear Envelope ◽  
Epoxy Resin ◽  
Membrane Structure ◽  
Root Meristem ◽  
Double Membrane ◽  
Nuclear Membranes ◽  
Cytoplasmic Surface ◽  
Different Types ◽  
The Status

In maize root meristem cells, fixed in KMnO4, embedded in epoxy resin, ultrathin sectioned, and studied with an electron microscope, the nuclear envelope is demonstrated to be a double membrane structure. In the nuclear envelope there are: pores of the sort reported in many species of animals and plants; different types of openings associated with extensions of both nuclear membranes into the cytoplasm; and also, often, large discontinuities. The nuclear envelope is a component of the general vesicular reticulum. The reticula of neighboring cells including the nuclear envelopes make up, at certain stages at least, a "systemic" structure. The status of the nuclear envelope as a component of the general cellular reticulum is recognized to change during differentiation. The existence of several types of discontinuities in the nuclear envelope and the extent of nuclear-cytoplasmic surface relationships indicated suggests alteration in concepts of transport and exchanges between nucleus and cytoplasm.

Experimental study on the mechanical properties of an epoxy-based nanocomposite using polymeric alloying and different nano-reinforcements: nanofiber, nanolayered and nanoparticulate materials

2015 ◽  
Vol 22 (6) ◽  
Author(s):  
Yasser Rostamiyan ◽  
Abdolhossein Fereidoon ◽  
Amin Hamed Mashhadzadeh
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Carbon Nanotube ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Diglycidyl Ether ◽  
Epoxy System ◽  
Different Types ◽  
Multi Wall Carbon Nanotube

AbstractThis study investigated the effect of four different types of reinforcements on the mechanical properties of an epoxy system. The epoxy resin used was diglycidyl ether of bisphenol A (DGEBA) cured by cycloaliphatic polyamine. These four mechanisms use a multi-wall carbon nanotube (MWCNT) as a nanofiber, clay as a nanolayer, SiO

scholarly journals Tribological Properties of Different Types of Graphene Nanoplatelets as Additives for the Epoxy Resin

2020 ◽  
Vol 10 (12) ◽  
pp. 4363
Author(s):  
Mónica Campo ◽  
Alberto Jiménez-Suárez ◽  
Alejandro Ureña
Keyword(s):  
Epoxy Resin ◽  
Barrier Properties ◽  
Graphene Nanoplatelets ◽  
Wear Behaviour ◽  
Good Effect ◽  
Optical Profilometry ◽  
Proper Selection ◽  
Coating Technology ◽  
Different Types ◽  
Selection Of

The use of graphene nanoplatelets for several purposes such as barrier properties and structural health monitoring is widely studied in polymer-based coating technology. Nevertheless, their extremely good effect on wear resistance makes them particularly interesting for coating technology. The effect of graphene nanoplatelets addition on the wear behaviour of an epoxy resin was analysed. The effects of graphene nanoplatelets content (0–8 wt.%), morphology and functionalization in wear behaviour were analysed by evaluating the main wear parameters of the nanocomposites studied. The morphology of the wear surfaces was analysed by scanning electron microscopy (SEM) and 3D optical profilometry in order to evaluate the mechanism and severity of wear. The results showed that the wear behaviour of the epoxy resin improved considerably with the addition of graphene, especially for higher contents. Moreover, as the wear mechanism depends on the morphology of graphene nanoplatelets, it was concluded that the proper selection of graphene can be made depending on the chosen application.

scholarly journals Attractiveness of different esthetic orthodontic wires

2020 ◽  
Vol 25 (6) ◽  
pp. 27-32
Author(s):  
Deric Meschiari Batista ◽  
Melissa Faccini ◽  
Fabricio Pinelli Valarelli ◽  
Rodrigo Hermont Cançado ◽  
Renata Cristina Oliveira ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Epoxy Resin ◽  
Orthodontic Wires ◽  
Significant Difference ◽  
Coated Wire ◽  
Different Types ◽  
Ceramic Brackets ◽  
Metallic Wires ◽  
Coated Wires ◽  
Niti Wires

ABSTRACT Objective: The aim of this study was to evaluate the attractiveness of different types of esthetic orthodontic wires by laypeople and dentists. Methods: Five different types of orthodontic wires were evaluated: three esthetic wires (Teflon-coated, epoxy resin-coated and rhodium-coated wires), and two metallic wires (stainless steel and NiTi), as control. Monocrystalline ceramic brackets were installed in the maxillary arch of a patient presenting good dental alignment. The five evaluated wires were attached to the orthodontic appliance with an esthetic silicone elastic and photographed. The photographs were evaluated by 163 individuals, 110 dentists and 53 laypeople. The data were statistically evaluated by two-way ANOVA and one-way ANOVA, followed by Tukey tests. Results: There was a statistically significant difference in the attractiveness among the wires evaluated; the most esthetic was the rhodium-coated wire, followed by the epoxy resin-coated wire and, finally, the Teflon-coated wire, with no significant difference from the stainless steel and NiTi control archwires. There was no significant difference between the groups of evaluators. Conclusion: The most attractive was the rhodium-coated wire, followed by the epoxy resin-coated wire and, finally, the least attractive wire was the Teflon-coated wire, without statistically significant difference to the stainless steel and NiTi wires, used as control.

Investigation on Effect of Nano-Fillers on Mechanical Properties of Epoxy Based Composites Using ANOVA

2017 ◽  
Vol 904 ◽  
pp. 137-141 ◽  
Author(s):  
Manjunath Shettar ◽  
Pavan Hiremath ◽  
U. Achutha Kini ◽  
Sathya Shankar Sharma
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Epoxy Resin ◽  
High Speed ◽  
Astm Standard ◽  
Weight Percentage ◽  
Basic Properties ◽  
Different Types ◽  
Properties Of Composites

The present work aims to fabricate and characterize epoxy based composites with varying wt. % of nanoparticles as filler and to investigate and analyze the effects of nanoclay and nanocarbon with different wt. % on the epoxy resin. Different types of composites are prepared using 0, 2, 4 and 6 wt. % of fillers with rest of epoxy resin. Fillers are mixed with the resin by high speed mechanical stirrer for 2 hours. The mixture is transferred to the mould and allowed to cure. The specimens are prepared based on ASTM standard. The specimens are tested for tensile and flexural strength. Adding fillers resulted in change in the basic properties. ANOVA is applied to find the significance effect of 4 different weight percentage of fillers and different variety of fillers on the properties of composites.

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