Studies on new type of phenolic resin—Curing reaction of bisphenol-A-based benzoxazine with epoxy resin using latent curing agent and the properties of the cured resin

2008 ◽  
Vol 109 (2) ◽  
pp. 1248-1256 ◽  
Author(s):  
Hajime Kimura ◽  
Akihiro Matsumoto ◽  
Keiko Ohtsuka
Keyword(s):  
Bisphenol A ◽  
Epoxy Resin ◽  
Phenolic Resin ◽  
Curing Agent ◽  
Curing Reaction ◽  
New Type ◽  
Resin Curing

Synthesis of Two Novolac Type Epoxy Resin Curing Agents and their Application

2013 ◽  
Vol 634-638 ◽  
pp. 3008-3016
Author(s):  
Yan Li ◽  
Zhi Nan Zhou ◽  
Xiao Yan Xu ◽  
Long Xie
Keyword(s):  
Mechanical Properties ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Curing Kinetics ◽  
Mass Ratio ◽  
Scanning Calorimetry ◽  
Curing Reaction ◽  
Novolac Resins ◽  
Curing Agents ◽  
Resin Curing

Two Novolac Resins Were Synthesized by the Reaction between Bisphenol A and Benzaldehyde (bis-BENR) or Bisphenol A and P-hydroxybenzaldehyde (bis-PHNR). Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR) Were Applied to Characterize the Molecular Structure of Bis-BENR (or Bis-PHNR). then the Two Novolac Resins Were Used as Curing Agent for Bisphenol A Type Epoxy Resin (DGEBA). the Curing Reaction and Curing Kinetics Were Studied by Dynamic FTIR and Differential Scanning Calorimetry (DSC). Dynamic FTIR Showed that the Two Novolac Resins Reacted with Epoxy Resins and Formed a Crosslinking Network Structure. DSC Results Show that the Optimum Mass Ratio between DGEBA and Bis-BENR (or Bis-PHNR) Was 7:3, under which the Curing Reaction Processed Completely. the Mechanical Properties and Sulfide Resistance of DGEBA/bis-BENR (or Bis-PHNR) System Were Also Investigated. the Results Showed that when the Mass Ratio between DGEBA and Bis-BENR (or Bis-PHNR) Was 7:3, the Curing Coatings Had Optimum Mechanical Properties and Sulfide Resistance.

Durability of Fracture-Filled Emeralds with a New Artificial Filler ExCel

2016 ◽  
Vol 680 ◽  
pp. 562-566
Author(s):  
Xiao Lei Chen ◽  
Hua Chen ◽  
Tai Jin Lu ◽  
Ming Yue He
Keyword(s):  
Hydrochloric Acid ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Scientific Basis ◽  
Curing Agent ◽  
Cutting Stability ◽  
Vis Spectroscopy ◽  
Greenish Blue ◽  
Resin Curing

Emerald is the green to greenish blue variety of beryl, which contains chromophore chrome and vanadium. Emeralds of all deposits have fissures, so most have been filled to avoid fragmentation during cutting. Stability is an important factor to filling emeralds. Recently, a new filler ExCel occurred, which is considered stable and removable, however, its durability is lack of scientific basis and testing. This study used magnification, fluorescence technology, FTIR and UV-Vis spectroscopy to investigate the durability of ExCel-filled emeralds. Emeralds filled with ExCel are relatively stable under conditions of daily wear in general, but durability decreased in hydrochloric acid, acetone or under heating to over 200°C. Fractures were more evident in side of emerald after hydrochloric acid immersion. After soaking in acetone fissures increased and deepened significantly. After heating to 250°C, brown material leaked from fissures of ExCel-filled emeralds, analyzed to be bisphenol A epoxy resin, curing agent and imine diluent components. The study has indicative significance for suitable conditions of ExCel-filled emerald wearing and preservation.

Preparation and Curing Behaviour of Epoxy Based Film for Moderate Temperature Prepreg

2017 ◽  
Vol 25 (8) ◽  
pp. 621-626
Author(s):  
Jiangwei Yao ◽  
Haihua Zhan ◽  
Zhuanyong Zou
Keyword(s):  
Bisphenol A ◽  
Epoxy Resin ◽  
Acid Anhydride ◽  
Moderate Temperature ◽  
Curing Agent ◽  
Film Composition ◽  
Orthogonal Experiments ◽  
Resin Curing ◽  
Hot Melt ◽  
Methyltetrahydrophthalic Anhydride

Bisphenol A epoxy resin and an acid anhydride [chosen from methyltetrahydrophthalic anhydride (Me-THPA), methylhexahydrophthalic anhydride (MHHPA) and methyl nadic anhydride (MNA)] were used to prepare epoxy films for hot melt prepreg. The effects of film composition, i.e. type and amount of epoxy resin, curing agent and curing catalyst, were investigated to develop a moderate temperature prepreg, and orthogonal experiments were used to investigate the effect of film composition on the curing behaviour of the epoxy resin film, and to determine the optimal formulation. The most favourable formulation film was cured at 100 °C for 2 h, and its curing degree was characterised by FTIR spectroscopy.

Epoxy resin curing reaction studied by proton multiple-quantum NMR

2015 ◽  
Vol 53 (18) ◽  
pp. 1324-1332 ◽  
Author(s):  
Mario Martin-Gallego ◽  
Antonio González-Jiménez ◽  
Raquel Verdejo ◽  
Miguel Angel Lopez-Manchado ◽  
Juan Lopez Valentin
Keyword(s):  
Epoxy Resin ◽  
Multiple Quantum ◽  
Curing Reaction ◽  
Resin Curing ◽  
Multiple Quantum Nmr

HIGH TECHNIQUE FOR T-PEEL STRENGTH ENHANCEMENT OF Al/AFRP HYBRID COMPOSITE

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4273-4278
Author(s):  
CHEOL-WOONG KIM ◽  
DONG-JOON OH
Keyword(s):  
Tensile Strength ◽  
Epoxy Resin ◽  
Hybrid Composite ◽  
Equivalence Ratio ◽  
Peel Strength ◽  
Aramid Fiber ◽  
Curing Agent ◽  
Mixture Ratio ◽  
Resin Mixture ◽  
Resin Curing

The interlaminar peel strength of Al / AFRP (Aluminum alloy/Aramid Fiber Reinforced Plastic) hybrid composite is affected by the adhesive strength between the Al alloy layer and the aramid fiber layer. The study of the tensile strength and the T-peel strength of the Al / AFRP should be accomplished first. Therefore, this study focused on the effect of the resin mixture ratio as the Al / AFRP on the tensile strength and T-peel strength. In conclusions, the resin mixture ratio by equivalence ratio of 〈epoxy resin : curing agent〉 equal to 〈1:1〉 of Al / AFRP -I and the resin mixture ratio by equivalence ratio of 〈epoxy resin : curing agent : accelerator〉 equal to 〈1:1:0.2〉 of Al / AFRP -II showed the highest ultimate tensile strength. After the T-peel test, it is found that the T-peel strength of Al / AFRP -II is approximately 1.5 times higher than that of Al / AFRP -I. Reviewing the characteristics of the tensile and T-peel strengths, the resin mixture ratio 〈1:1:0.2〉 of Al / AFRP -II showed the highest tensile strength and T-peel strength.

Studies on Mechanical and Thermal Properties of Epoxy Resin Modified by Fluorine-Containing Silicone

2013 ◽  
Vol 401-403 ◽  
pp. 713-716
Author(s):  
Cheng Fang ◽  
Dong Bo Guan ◽  
Wei Guo Yao ◽  
Shou Jun Wang ◽  
Hui An
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Bending Strength ◽  
Mechanical And Thermal Properties ◽  
Curing Agent ◽  
Epoxy System ◽  
Resin Curing ◽  
The Impact ◽  
Modified Epoxy

The epoxy resin was modified with the mixture of α,ω-dihydroxy poly-(3,3,3-trifluoropropyl) siloxane (PTFPMS), KH560 and stannous octoate. KH560 can react with PTFPMS and also epoxy resin curing agent. The two reactions were characterized by FI-IR. The modified epoxy resin was characterized by FI-IR. The result showed that fluorine-containing silicone had been successfully introduced into the epoxy system. The mechanical and thermal properties of the modified epoxy resin were analyzed. The results showed that with the increase of PTFPMS the impact strength of epoxy resin increased, hardness and bending strength correspondingly reduced, slight decrease in the glass transition temperature.

Curing study and evaluation of epoxy resin with amine functional chloroaniline acetaldehyde condensate

2015 ◽  
Vol 44 (1) ◽  
pp. 19-25
Author(s):  
T. Maity ◽  
B.C. Samanta
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Epoxy Resin ◽  
Ph Value ◽  
Kinetic Studies ◽  
Diglycidyl Ether ◽  
Curing Agent ◽  
Scanning Calorimetry ◽  
Content Type ◽  
Curing Reaction

Purpose – The purpose of this paper was to check effectiveness of amine functional chloroaniline acetaldehyde condensate (AFCAC) as a new curing agent for diglycidyl ether of bisphenol A (DGEBA) resin. For this purpose, first AFCAC was synthesised, characterised and then curing reaction was carried out. Design/methodology/approach – Equimolecular mixture of AFCAC and DGEBA was subjected to curing reaction, and the reaction was followed by differential scanning calorimetry (DSC) analysis. The kinetic studies of this curing reaction were also carried out from those DSC exotherms. The mechanical properties, dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) of cured epoxy were also reported. Findings – DSC results reflected the effective first order curing reaction of AFCAC with epoxy resin. Mechanical properties reflected appreciable rigidity of AFCAC cured epoxy matrix and TGA showed that the cured epoxy networks were thermally stable up to around 297°C. Research limitations/implications – The curing agent AFCAC was synthesised by using chloroaniline and acetaldehyde in acid medium. There are some limitations for this procedure. The synthetic procedure is pH dependent. So reaction cannot be done at any pH value. The reaction must also be carried out at room temperature without any heating. To obtain low molecular weight curing agent, chloroaniline and acetaldehyde cannot be taken in equimolecular ratio because the equimolecular mixture of them produces high molecular weight condensate. This was shown in our previous publication. Some implications are also there. By changing amine and aldehyde other curing agents could be synthesised and the curing efficiency of those for epoxy resin could also be studied. Originality/value – Experimental results revealed the greater suitability of AFCAC as curing agent for DGEBA resin and novelty of AFCAC cured matrix in the field of protective coating, casting, adhesives, etc.

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