scholarly journals Development and Characterization of Novel Interpenetrating Network (IPN) Foams from Epoxy Ester and Aliphatic Epoxy Resin

2009 ◽  
Vol 6 (2) ◽  
pp. 341-347 ◽  
Author(s):  
Kanuprasad Patel ◽  
Dhirubhai Desai ◽  
Santosh Bhuva
Keyword(s):  
Epoxy Resin ◽  
Room Temperature ◽  
Glycidyl Ether ◽  
Diglycidyl Ether ◽  
Interpenetrating Network ◽  
Acrylate Monomer ◽  
Molar Ratios ◽  
Compression Properties ◽  
Rise Direction

Diglycidyl ether of bisphenol-A (DGEBA) was reacted with acrylate monomer at variable molar ratios. The reaction between glycerine and epichlorohydrine form glycidyl ether of polyol aliphatic epoxy resin. The resultant resins were characterized duly. Both the resins were mixed at different ratios with constant high shear stirring. The obtained mixture and suitable additives were heated at 150oC for one and half hour. The so called Interpenetrating Network (IPN) transformed into foams. The performance of foams was evaluated by testing for compression in both parallel and perpendicular to rise direction. The tests were carried out at room temperature and at the elevated temperature. The compression properties showed a decreasing trend for increasing amounts of glycerine resin. The density and thermal properties of epoxy foams were also evaluated. The relation between the composition, density and properties of the foam was analyzed.

scholarly journals Rheological and Electrical Study of a Composite Material Based on an Epoxy Polymer Containing Cyclotriphosphazene

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 921 ◽  
Author(s):  
O. Dagdag ◽  
M. El Gouri ◽  
A. El Mansouri ◽  
A. Outzourhit ◽  
A. El Harfi ◽  
...  
Keyword(s):  
Composite Material ◽  
Epoxy Resin ◽  
Room Temperature ◽  
Electrical Characterization ◽  
Small Deformation ◽  
Diglycidyl Ether ◽  
Localized States ◽  
Frequency Variation ◽  
Linear Viscoelastic ◽  
Electrical Study

In this work, we have studied, formulated, prepared, and characterized the rheological and electrical behavior of a composite material based on an epoxy resin Diglycidyl Ether of Bisphenol A (DGEBA) reinforced with hexaglycidyl cyclotriphosphazene (HGCP). The epoxy system was cured with 4,4’-methylene dianiline (MDA). DGEBA-HGCP-MDA epoxy composite materials with reinforced HGCP which varied from 5% to 10% by weight were prepared by mixing in the molten state. The morphology was evaluated by SEM. The rheological behavior was studied using small deformation rheology. The electrical characterization was carried out with a frequency variation range from 1 Hz to 100 KHz at room temperature. These measurements revealed that the rheological and electrical behaviors strongly depend on the quantity of HGCP in the DGEBA matrix. The linear viscoelastic properties study reveals that the modulus of elasticity G’ is dependent on the amount of HGCP present in the epoxy resin DGEBA. The capacitance-frequency measurements suggest a distribution of localized states in the band gap of the blends.

scholarly journals Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

2013 ◽  
Vol 13 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Rajesh Pandit ◽  
Albrecht Berkessel ◽  
Ralf Lach ◽  
Wolfgang Grellmann ◽  
Rameshwar Adhikari
Keyword(s):  
Fourier Transform ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Layered Silicate ◽  
Diglycidyl Ether ◽  
Synthesis And Characterization ◽  
Microindentation Technique

Polystyrene–polybutadiene block copolymers having different molecular architectures were epoxidized by using meta-chloroperoxybenzoic acid (MCPBA). Then, the blends with epoxy resin (diglycidyl ether of bisphenol-A; DGEBA) and their nanocomposites with boehmite and layered silicate nanofiller in presence of methylene dianiline (MDA) as a hardener were prepared. The epoxidized copolymers and the composites were characterized by Fourier transform infrared (FTIR) spectroscopy and microindentation technique. In this way, it was possible to tune the morphology of the nanostructured blends of the epoxy resin using the functionalized block copolymer as the template. The presence of nanostructured morphology was attested by the optical transparency of the blends as well as of the composites with nanofiller. The microhardness properties were improved by the incorporation of the nanoparticles, viz. boehmite and layered silicate. Nepal Journal of Science and Technology Vol. 13, No. 1 (2012) 81-88 DOI: http://dx.doi.org/10.3126/njst.v13i1.7445

scholarly journals New Eco-Friendly Synthesized Thermosets from Isoeugenol-Based Epoxy Resins

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 229 ◽  
Author(s):  
Quentin Ruiz ◽  
Sylvie Pourchet ◽  
Vincent Placet ◽  
Laurent Plasseraud ◽  
Gilles Boni
Keyword(s):  
Epoxy Resin ◽  
Storage Modulus ◽  
Epoxy Resins ◽  
Diglycidyl Ether ◽  
Thermal And Mechanical Properties ◽  
Optimum Ratio ◽  
Structural Composites ◽  
Molar Ratios ◽  
Elemental Analyses ◽  
Dsc Analyses

Epoxy resin plays a key role in composite matrices and DGEBA is the major precursor used. With the aim of favouring the use of bio resources, epoxy resins can be prepared from lignin. In particular, diglycidyl ether of isoeugenol derivatives are good candidates for the replacement of DGEBA. This article presents an effective and eco-friendly way to prepare epoxy resin derived from isoeugenol (BioIgenox), making its upscale possible. BioIgenox has been totally characterized by NMR, FTIR, MS and elemental analyses. Curing of BioIgenox and camphoric anhydride with varying epoxide function/anhydride molar ratios has allowed determining an optimum ratio near 1/0.9 based on DMA and DSC analyses and swelling behaviours. This thermoset exhibits a Tg measured by DMA of 165 °C, a tensile storage modulus at 40 °C of 2.2 GPa and mean 3-point bending stiffness, strength and strain at failure of 3.2 GPa, 120 MPa and 6.6%, respectively. Transposed to BioIgenox/hexahydrophtalic anhydride, this optimized formulation gives a thermoset with a Tg determined by DMA of 140 °C and a storage modulus at 40 °C of 2.6 GPa. The thermal and mechanical properties of these two thermosets are consistent with their use as matrices for structural or semi-structural composites.

Synthesis and characterization of nanocomposites of silicon dioxide and polyurethane and epoxy resin interpenetrating network

2003 ◽  
Vol 52 (9) ◽  
pp. 1493-1497 ◽  
Author(s):  
Hongwen Zhang ◽  
Bing Wang ◽  
Hongtu Li ◽  
Yan Jiang ◽  
Jingyuan Wang
Keyword(s):  
Silicon Dioxide ◽  
Epoxy Resin ◽  
Synthesis And Characterization ◽  
Interpenetrating Network

Preparation and characterization of cardanol-based epoxy resin for coating at room temperature curing

2013 ◽  
Vol 130 (4) ◽  
pp. 2468-2478 ◽  
Author(s):  
Shinji Kanehashi ◽  
Kota Yokoyama ◽  
Risa Masuda ◽  
Takashi Kidesaki ◽  
Kazukiyo Nagai ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Room Temperature

Curing Behavior for Microencapsulated Curing Agents on Epoxy Resin Systems

2015 ◽  
Vol 737 ◽  
pp. 150-153
Author(s):  
Xi Wang
Keyword(s):  
Epoxy Resin ◽  
Room Temperature ◽  
Reaction Order ◽  
Diglycidyl Ether ◽  
Initiation Mechanism ◽  
Step Initiation ◽  
Two Samples ◽  
Curing Kinetic ◽  
Evaporation Technique ◽  
Curing Agents

Microcapsules containing a curing agent, 2-phenyl imidazole (2PZ), for a diglycidyl ether of bisphenol A (DGEBA) epoxy resin were prepared by a solid-in-oil-inwater emulsion solvent evaporation technique with poly (methyl methacrylate) (PMMA) as a polymeric wall. The former could take more than 3 months at room temperature, whereas the latter was cured after only a week. The values of the reaction order (a curing kinetic parameter) for DGEBA/2PZ and DGEBA/2PZ–PMMA microcapsules were quite close, and this showed that the curing reactions of the two samples proceeded conformably. The curing mechanism was investigated, and a two-step initiation mechanism was considered: the first was assigned to adduct formation, whereas the second was due to alkoxide-initiated polymerization.

scholarly journals Benzoxazine Copolymers with Mono- and Difunctional Epoxy Active Diluents with Enhanced Tackiness and Reduced Viscosity

2021 ◽  
Vol 5 (9) ◽  
pp. 250
Author(s):  
Natalia V. Bornosuz ◽  
Roman F. Korotkov ◽  
Vyacheslav V. Shutov ◽  
Igor S. Sirotin ◽  
Irina Yu. Gorbunova
Keyword(s):  
Differential Scanning Calorimetry ◽  
Tensile Strength ◽  
Glass Transition ◽  
Room Temperature ◽  
Glycidyl Ether ◽  
Diglycidyl Ether ◽  
Scanning Calorimetry ◽  
Reduced Viscosity ◽  
Oscillatory Rheology ◽  
Active Diluents

The influence of epoxy active diluents, 1,4-butanediol diglycidyl ether (BD) and furfuryl glycidyl ether (FUR), in the mixtures with benzoxazine monomer based on bisphenol A, formaldehyde and m-toluidine (BA-mt), on the properties of a matrix was disclosed in this work. Resins were modified to achieve good tackiness at room temperature and reduced viscosity. The influence of mono- and difunctional modifiers on the process of curing was studied by way of differential scanning calorimetry and oscillatory rheology. The addition of BD and FUR shifted the curing peak to higher temperatures and significantly reduced viscosity. Preferable tackiness at ambient temperature was achieved with 10 phr of epoxy components in mixtures. However, cured blends with difunctional epoxy BD had an advantage over monofunctional FUR in enhanced tensile strength with remaining glass transition temperature at the level of neat benzoxazine (217 °C).

Synthesis and characterization of a high refractive diglycidyl ether of thiodibenzenethiol epoxy resin

2012 ◽  
Vol 69 (3) ◽  
pp. 337-345 ◽  
Author(s):  
Chaoyun Luo ◽  
Jianqing Zhao ◽  
Yanchao Yuan ◽  
Jiandong Zuo ◽  
Xuechun Lin ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Diglycidyl Ether ◽  
Synthesis And Characterization
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