Effect of Incomplete d Orbital on the Epoxy Resins Properties: Synthesis and Characterization

Mohan, Pragyan; Srivastava, A. K.

doi:10.1080/10601329508020343

Cited by 5 publications

(12 citation statements)

References 8 publications

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“…The flow rate was maintained at 1 mL/min. Various physicochemical properties, including specific gravity, refractive index, color value, and hydroxyl value,22 of these polymeric resins were also determined per standard methods (Table I).…”

Section: Methodsmentioning

confidence: 99%

Synthesis, characterization, and performance evaluation of hard, anticorrosive coating materials derived from diglycidyl ether of bisphenol A acrylates and methacrylates

Ahmad¹,

Ashraf²,

Hassan³

et al. 2004

J of Applied Polymer Sci

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Diglycidyl ether of bisphenol A acrylate (DAC) and diglycidyl ether of bisphenol A methacrylate (DMAC) were synthesized by the reaction of an epoxy [diglycidyl ether of bisphenol A (DGEBA)] with acrylic acid and methacrylic acid, respectively. The synthesized resins were characterized by determination of the acid, hydroxyl, and saponification values. Structure elucidation was done by gel permeation chromatography, Fourier transform infrared spectroscopy, 1 H-NMR spectroscopy, and 13 C-NMR spectroscopy. DACs were cured with melamine formaldehyde resin at low pH values. The pH of the resin systems was adjusted with phosphoric acid. The coatings of these systems were formed on mild steel specimens for physicomechanical and chemical/corrosion-resistance performance. The coatings of DAC and DMAC showed excellent scratch hardness and good impact-resistance performance. The coatings of DMAC showed better performance than DAC with respect to chemical and corrosion resistance. Thermogravimetric analysis and differential scanning calorimetry were used to investigate the thermal stability and curing behavior of these systems. DAC showed a little higher glasstransition temperature than DMAC and also showed a higher thermal resistivity.

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Section: Methodsmentioning

confidence: 99%

Synthesis, characterization, and performance evaluation of hard, anticorrosive coating materials derived from diglycidyl ether of bisphenol A acrylates and methacrylates

Ahmad¹,

Ashraf²,

Hassan³

et al. 2004

J of Applied Polymer Sci

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show abstract

“…Therefore, the complex (Scheme 3) has been assigned following structure: 10 copper acrylate (245 equiv/ 100 g), 9 chromium acrylate (270 equiv/100 g), 11 and nickel acrylate (238 equiv/100 g). 8 This is due to presence of unpaired electron in the d-orbital of metal. These data shows that the EEW increases on increasing the number of unpaired electrons in d-orbital except Cr(Ar 3d Table I further reveals that the molecular weight of epoxy resins is just double of EEW.…”

Section: Resultsmentioning

confidence: 99%

“…Transition metals have partially filled d-orbital and the interaction of d orbital can then give rise to the presence of electrons in a partially filled d-band and metallic conductivity. ) and even epoxy resins containing acrylate 8 These data show that the electrical conductivity increases on increasing the number of unpaired electrons in d orbital of metals. These electrons are able to promote in their conducting band.…”

Section: Electrical Conductivitymentioning

confidence: 87%

Effect of cobalt on the electrical conductive property of epoxy resins

Mohan

2009

J of Applied Polymer Sci

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Cobalt acrylate (CoA 2 ) has been treated with bisphenol-A and epichlorohydrin to modify epoxy resins. It was cured with p-acetylbenzilidene triphenyl arsonium ylide. The properties such as epoxide equivalent weight (equiv/100 g), molecular weight, hydrolyzable chlorine content increases whereas hydroxyl content, refractive index decreases in the presence of CoA 2 . The cured epoxy resins shows improve electrical conductivity due to the incorporation of CoA 2 with epoxy resins. The influence of complex formation of CoA 2 with either linkage of epoxy resins were investigated by spectroscopy. The decrease in T g from differential scanning calorimetry support the improve in flexibility. The dispersion of cobalt in epoxy resins matrix was confirmed by scanning electron microscope.

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“…A resin sample containing the metal-ylide complex was stable up to 280 • C and started to decompose above this temperature; however, the control epoxy resin (ER A ) was stable only up to 130 • C. In the modified epoxy resin, rapid decomposition was observed at 300-400 • C and almost total volatilization occurred around 600 • C, which confirms that incorporation of the metal-ylide complex increases the thermal stability of the polymer. The activation energy (E a ) and order of the reaction were calculated from the Coats and Redfern [16] equation:…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of epoxy resin in the presence of the p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex

Pandey¹,

Srivastava²

2000

Designed Monomers and Polymers

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Modified epoxy resins have been synthesized by reacting a 1 : 10 mole ratio of bisphenol-A and epichlorohydrin in the presence of the p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex at 30 • C. The value(s) for the epoxide equivalent weight and chlorine content are higher for the modified epoxy resin than for the control epoxy resin. The hydroxyl content, viscosity, and refractive indices are smaller than the control values. DSC studies show that percentage crystallinity (50% and 70%), degree of cure (α ) (0.62 and 0.84), and the glass transition temperature (T g ) (278 • C and 302 • C) of the modified epoxy resins are higher than those of the control epoxy resin. The p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex modifies and cures the epoxy resin simultaneously. The activation energy, determined from TGA, is 86 kJ/ mol and the reaction shows first-order kinetics.

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Effect of Incomplete d Orbital on the Epoxy Resins Properties: Synthesis and Characterization

Cited by 5 publications

References 8 publications

Synthesis, characterization, and performance evaluation of hard, anticorrosive coating materials derived from diglycidyl ether of bisphenol A acrylates and methacrylates

Synthesis, characterization, and performance evaluation of hard, anticorrosive coating materials derived from diglycidyl ether of bisphenol A acrylates and methacrylates

Effect of cobalt on the electrical conductive property of epoxy resins

Synthesis and characterization of epoxy resin in the presence of the p-bromophenacyl dimethylsulfonium ylide-mercuric chloride complex

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