Bisphenol-A benzoxazine and cycloaliphatic epoxy copolymer for composite processing by resin infusion

2018 ◽  
Vol 53 (13) ◽  
pp. 1777-1790 ◽  
Author(s):  
E Barjasteh ◽  
S Gouni ◽  
C Sutanto ◽  
P Narongdej
Keyword(s):  
Bisphenol A ◽  
Epoxy Resin ◽  
Cure Kinetics ◽  
Reaction Model ◽  
Scanning Calorimetry ◽  
Resin Infusion ◽  
Composite Processing ◽  
Kinetic Curves ◽  
Cycloaliphatic Epoxy ◽  
Cycloaliphatic Epoxy Resin

The process and high-temperature performance of bisphenol-A based benzoxazine were tailored by copolymerizing with bi-functional cycloaliphatic epoxy resin in order to be used as a matrix for the advanced composite fabrication. The melt viscosity, cure kinetics, thermo-mechanical, and tensile properties of the systems with various cycloaliphatic epoxy resin and benzoxazine concentrations were studied using rheometer, differential scanning calorimetry, dynamic mechanical analyzer, and micro-tensile tester, respectively. Mixtures with cycloaliphatic epoxy resin concentration greater than 25 wt.% provided a suitable viscosity for composite processing by resin infusion. The isothermal and nonisothermal cure kinetics of the benzoxazine and cycloaliphatic epoxy resin reaction was studied. The predicted kinetic curves based on Kamal and Sourour phenomenological reaction model expanded with a diffusion factor resulted in an agreement with the experimental kinetic curves. The investigation of copolymers with various mixture compositions showed an increase of 56% in glass-transition temperature ([Formula: see text] and 79% in cross-linking density by increasing epoxy concentration up to 40 wt.% in comparison with homopolymerized benzoxazine.

Investigating the relationship between tack and degree of conversion in DGEBA-based epoxy resin cured with dicyandiamide and diuron

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Kuliaei ◽  
Iraj Amiri Amraei ◽  
Seyed Rasoul Mousavi
Keyword(s):  
Epoxy Resin ◽  
Reaction Order ◽  
Theoretical Data ◽  
Cure Kinetics ◽  
Diglycidyl Ether ◽  
Degree Of Conversion ◽  
Ozawa Method ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
Kinetics Of

Abstract The purpose behind this research was to determine the optimum formulation and investigate the cure kinetics of a diglycidyl ether of bisphenol-A (DGEBA)-based epoxy resin cured by dicyandiamide and diuron for use in prepregs. First, all formulations were examined by the tensile test, and then, the specimens with higher mechanical properties were further investigated by viscometry and tack tests. The cure kinetics of the best formulation (based on tack test) in nonisothermal mode was investigated using differential scanning calorimetry at different heating rates. Kissinger and Ozawa method was used for determining the kinetic parameters of the curing process. The activation energy obtained by this method was 71.43 kJ/mol. The heating rate had no significant effect on the reaction order and the total reaction order was approximately constant ( m + n ≅ 2.1 $m+n\cong 2.1$ ). By comparing the experimental data and the theoretical data obtained by Kissinger and Ozawa method, a good agreement was seen between them. By increasing the degree of conversion, the viscosity decreased; as the degree of conversion increased, so did the slope of viscosity. The results of the tack test also indicated that the highest tack could be obtained with 25% progress of curing.

Synthesis and characterization of a novel cycloaliphatic epoxy resin starting from dicyclopentadiene

2007 ◽  
Vol 43 (5) ◽  
pp. 2149-2154 ◽  
Author(s):  
Xiaohua Zhang ◽  
Zhenghua Zhang ◽  
Xinnian Xia ◽  
Zhisen Zhang ◽  
Weijian Xu ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Synthesis And Characterization ◽  
Cycloaliphatic Epoxy ◽  
Cycloaliphatic Epoxy Resin

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

scholarly journals Investigation on cure kinetics of epoxy resin containing carbon nanotubes modified with hyper-branched polyester

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 29830-29839 ◽  
Author(s):  
Li Lu ◽  
Liao Xia ◽  
Hao Zengheng ◽  
Sheng Xingyue ◽  
Zhang Yi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Differential Scanning Calorimetry ◽  
Epoxy Resin ◽  
Cure Kinetics ◽  
Scanning Calorimetry ◽  
Kinetics Of

The cure kinetics of epoxy resin cured by D-EP, D-EP/CNT composites and D-EP/CNTs-H20 were investigated by non-isothermal differential scanning calorimetry (DSC).

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