scholarly journals Effects of Different Montmorillonite Nanoclay Loading on Cure Behavior and Properties of Diglycidyl Ether of Bisphenol A Epoxy

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Alfred Tcherbi-Narteh ◽  
Mahesh Hosur ◽  
Shaik Jeelani
Keyword(s):  
Reaction Mechanism ◽  
Bisphenol A ◽  
Reaction Rate Constant ◽  
Diglycidyl Ether ◽  
Scanning Calorimetry ◽  
Cure Reaction ◽  
Cure Behavior ◽  
Lower Shear ◽  
Primary Focus ◽  
Montmorillonite Nanoclay

The primary focus of this study was to understand the effects of different amounts of montmorillonite nanoclay (MMT) loading on viscosity, cure behavior, reaction mechanism, and properties of diglycidyl ether of bisphenol A (DGEBA) epoxy composites. Influence of 1–3 wt.% MMT on rheological and subsequent cure behavior of SC-15 epoxy resin was studied using nonisothermal and isothermal rheometry and differential scanning calorimetry (DSC). Rheological properties were influenced by different amounts of MMT at lower shear rates prior to and during curing. Cure reaction mechanism was unaffected by different MMT concentration; however heat and activation energy of reactions increased with increasing MMT loading. Samples with 2 wt.% MMT showed highest reaction rate constant, indicative of catalytic behavior. X-ray diffraction (XRD) and transmission electron microscope (TEM) revealed mainly intercalated microstructure throughout the MMT infused epoxy composite samples irrespective of the percent loading.

scholarly journals Effects of Surface Treatments of Montmorillonite Nanoclay on Cure Behavior of Diglycidyl Ether of Bisphenol A Epoxy Resin

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Alfred Tcherbi-Narteh ◽  
Mahesh V. Hosur ◽  
Eldon Triggs ◽  
Shaik Jelaani
Keyword(s):  
Activation Energy ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Rheological Properties ◽  
Diglycidyl Ether ◽  
Curing Temperature ◽  
Cure Behavior ◽  
Cloisite 30B ◽  
Temperature Activation ◽  
Primary Focus

Diglycidyl ether of Bisphenol A (DGEBA) based SC-15 epoxy resin was modified with three different commercially available montmorillonite (MMT) nanoclay: Nanomer I.28E and Cloisite 10A and 30B. Cure behavior of nanocomposites was studied using a variety of techniques. Primary focus of this study was to investigate influence of different surface modifications of MMT nanoclay on rheological properties and cure behavior of SC-15 epoxy resin. By adding MMT to SC-15 epoxy resin, chemistry of the epoxy is altered leading to changes in rheological properties and ultimately enthalpy and activation energy of reactions. Addition of Nanomer I.28E delayed gelation, while Cloisite 10A and 30B accelerated gelation, regardless of the curing temperature. Activation energy of reaction was lower with the addition of Nanomer I.28E and Cloisite 10A and higher for Cloisite 30B compared to neat SC-15 epoxy composite.

Study on curing kinetics of a diglycidyl ether of bisphenol A epoxy resin/microencapsulated curing agent system

2012 ◽  
Vol 24 (8) ◽  
pp. 730-737 ◽  
Author(s):  
Wang Fang ◽  
Xiao Jun ◽  
Wang Jing-wen ◽  
Li Shu-qin
Keyword(s):  
Particle Size ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Diglycidyl Ether ◽  
Wall Material ◽  
Curing Agent ◽  
Resin System ◽  
Scanning Calorimetry ◽  
Cure Reaction ◽  
Epoxy Resin System

A modified imidazole curing agent, EMI-g-BGE, was encapsulated for one-package of diglycidyl ether of bisphenol A (DGEBA) epoxy resin system. Polyetherimide (PEI) was used as the wall material, and the emulsion solvent evaporation method was used to form the microcapsules. The morphology and particle size distribution of microcapsules were evaluated by scanning electron microscopy (SEM), mastersizer analyzer. Microcapsules exhibited spherical shapes and the mean particle size was about 745 nm. The curing kinetic of DGEBA/microcapsules curing agent was studied by nonisothermal differential scanning calorimetry (DSC) technique at different heating rates. Dynamic DSC scans indicated the microcapsule was an effective curing agent of epoxy resin. The apparent activation energy Ea was 88.03 kJ/mol calculated through Kissinger method, more than DGEBA/EMI-g-BGE system. This microcapsule of EMI-g-BGE exhibited a long shelf life, and the curing did not occur in this epoxy-microcapsule resin system for more than 3months at room temperature. The kinetic parameters were determined by Málek method and a two-parameter ( m, n) autocatalytic model (Šesták–Berggren equation) was found to be the most adequate selected kinetic model, which showed the encapsulation of the curing agent EMI-g-BGE did not change the cure reaction mechanism of the epoxy resin system. From the experimental data, the nonisothermal DSC curves show the results being in accordant with those theoretically calculated.

scholarly journals Preparation and Characterization of Green Epoxy Resin Composites and Its Use in Corrosion Resistance

2018 ◽  
Author(s):  
Abbas Hassan Faris
Keyword(s):  
Bisphenol A ◽  
Epoxy Resin ◽  
Electrolyte Solutions ◽  
Kraft Lignin ◽  
Diglycidyl Ether ◽  
Kraft Pulping ◽  
Palm Tree ◽  
Scanning Calorimetry ◽  
Ft Ir ◽  
Nano Titanium Dioxide

In this work, appropriate alternative for diglycidyl ether bisphenol A (DGEBA) was found to avoid the destructive effects of bisphenol A. Lignin, an aromatic compound from palm tree leaves, was used as a renewable material to synthesize a bio-based epoxy resin. Lignin extracted using Kraft pulping process. Kraft Lignin was epoxidized with epichlorohydrin in alkaline medium. Nano-titanium dioxide was used as filler with ratio of 10% to prepare the green epoxy composite. The structure of the Kraft lignin and lignin-based epoxy resin was proven via Infrared spectra (FT-IR) were recorded using solid KBr disk by testing Shimadzu (FT-IR-8300) spectrophotometer. The thermal properties of the curing process of lignin-based epoxy resin and composite were investigate using Differential scanning calorimetry (DSC) analysis. Potentiodynamic measurements data revealed that the anti-corrosion performance of the lignin based epoxy resin. The study demonstrates successful of epoxidation of Kraft lignin. In addition, lignin based eopxy resin showed effective inhibitor for carbon steel in 3.5 wt. % NaCl electrolyte solutions

Azomethine ether-based potential curing agent for epoxy resin (diglycidyl ether of bisphenol A): Synthesis and characterization

2020 ◽  
pp. 009524432092857
Author(s):  
Fozia Noreen ◽  
Ahtaram Bibi ◽  
Naila Khalid ◽  
Imran Ullah Khan
Keyword(s):  
Spectral Analysis ◽  
Bisphenol A ◽  
Light Emission ◽  
Condensation Reaction ◽  
Stokes Shift ◽  
Green Light ◽  
Diglycidyl Ether ◽  
Proton Nuclear Magnetic Resonance ◽  
Curing Agent ◽  
Scanning Calorimetry

Novel azomethine ether-based compounds (A: N-((4-(9-(4-(phenylimino)methyl)phenoxy)nonyloxy)benzylidene)bezenamine and B: N-((4-(9-(4-(p-hydroxyphenylimino)methyl)phenoxy)nonyloxy)benzylidene)-4-hydroxybenzenamine) were synthesized by condensation reaction of dialdehyde, 4,4-(1,9-nonandiyle)bis(oxy)dibenzaldehyde with aromatic amines. Structures of synthesized compounds were successfully characterized by Fourier transform infrared (FTIR), ultraviolet–visible, proton nuclear magnetic resonance imaging and photoluminescence (PL) spectroscopy. The PL spectral analysis revealed that emission maxima of compounds A and B are at 475 and 500 nm, respectively, indicate blue and green light emission with large Stokes shift range (Δ λ ST, 109–138 nm). Two series of polymers: one azomethine-based polymers (C1–C5) and other without azomethine (H1–H4) were prepared by curing diglycidyl ether of bisphenol A with a synthesized curing agent (B) and commercial curing agent, respectively, in various proportions. The structural characterization of the resulting polymers was carried out by FTIR spectral analysis. Thermal properties revealed that azomethine-based polymers (C1–C5) were thermally stable up to 400°C as compared to H1–H4. The glass transition temperature of the polymers, determined by differential scanning calorimetry, was in the range 121–123°C.

scholarly journals Dynamic Cure Kinetics and Physical-Mechanical Properties of PEG/Nanosilica/Epoxy Composites

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Haleh Nowruzi Varzeghani ◽  
Iraj Amiri Amraei ◽  
Seyed Rasoul Mousavi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cure Kinetics ◽  
Diglycidyl Ether ◽  
Solid Particles ◽  
Scanning Calorimetry ◽  
Cure Reaction ◽  
Cure Kinetic ◽  
Cure Temperature ◽  
Kinetics Of

This study investigated the effect of polyethylene glycol (PEG) and nanosilica (NS) on the physical-mechanical properties and cure kinetics of diglycidyl ether of bisphenol-A-based epoxy (DGEBA-based EP) resin. For this purpose, tensile and viscometry tests, dynamic mechanical thermal analysis (DMTA), and differential scanning calorimetry (DSC) were carried out under dynamic conditions. The results showed that adding NS and PEG enhances the maximum cure temperature as well as the heat of cure reaction (ΔH) in EP-NS, while it decreases in EP-PEG and EP-PEG-NS. The cure kinetic parameters of EP-PEG-NS were calculated by Kissinger, Ozawa, and KSA methods and compared with each other. The Ea calculated from the Kissinger method (96.82 kJ/mol) was found to be lower than that of the Ozawa method (98.69 kJ/mol). Also, according to the KAS method, the apparent Ea was approximately constant within the 10-90% conversion range. Tensile strength and modulus increased by adding NS, while tensile strength diminished slightly by adding PEG to EP-NS. The glass transition temperature (Tg) was calculated using DMTA which was increased and decreased by the addition of NS and PEG, respectively. The results of the viscometry test showed that the viscosity increased with the presence of both PEG and NS and it prevented the deposition of solid particles.

scholarly journals Surface Properties of Poly(Hydroxyurethane)s Based on Five-Membered Bis-Cyclic Carbonate of Diglycidyl Ether of Bisphenol A

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5184
Author(s):  
Mariusz Tryznowski ◽  
Zuzanna Żołek-Tryznowska
Keyword(s):  
Bisphenol A ◽  
Surface Properties ◽  
Rheological Characteristic ◽  
13C Nmr Spectroscopy ◽  
Cyclic Carbonate ◽  
Contact Angles ◽  
Diglycidyl Ether ◽  
Scanning Calorimetry ◽  
Static Contact ◽  
Ft Ir

Poly(hydroxyurethane)s (PHU) are alternatives for conventional polyurethanes due to the use of bis-cyclic dicarbonates and diamines instead of harmful and toxic isocyanates. However, the surface properties of poly(hydroxyurethane)s are not well known. In this work, we focus on the analysis of the surface properties of poly(hydroxyurethane) coatings. Poly(hydroxyurethane)s were obtained by a catalyst-free method from commercially available carbonated diglycidyl ether of bisphenol A (Epidian 6 epoxy resins) and various diamines: ethylenediamine, trimethylenediamine, putrescine, hexamethylenediamine, 2,2,4(2,4,4)-trimethyl-1,6-hexanediamine, m-xylylenediamine, 1,8-diamino-3,6-dioxaoctane, 4,7,10-trioxa-1,13-tridecanediamine, and isophorone diamine, using a non-isocyanate route. The structures of the obtained polymers were confirmed by FT-IR, 1H NMR and 13C NMR spectroscopy, and thermogravimetric (TGA) and differential scanning calorimetry (DSC) analyses were performed. The rheological characteristic of the obtained polymers is presented. The static contact angles of water, diidomethane, and formamide, deposited on PHU coatings, were measured. From the measured contact angles, the surface free energy was calculated using two different approaches: Owens–Wendt and van Oss–Chaudhury–Good. Moreover, the wetting envelopes of PHU coatings were plotted, which enables the prediction of the wetting effect of various solvents. The results show that in the investigated coatings, a mainly dispersive interaction occurs.

Cure Behavior and Thermal Properties of Poly (Amide-Amidic Acid) Modified Diglycidyl Ether of Bisphenol-A/4,4′-Diaminodiphenylsulfone

2013 ◽  
Vol 52 (11) ◽  
pp. 1613-1625
Author(s):  
Haiming Chen ◽  
Yuning Ma ◽  
Ting Huang ◽  
Chao Su ◽  
Pei Liu ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Bisphenol A ◽  
Diglycidyl Ether ◽  
Cure Behavior
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