Solvent Exchange to Exfoliate Graphene Oxides into Epoxy with Improved Mechanical and Thermal Properties

2015 ◽  
Vol 1110 ◽  
pp. 69-72
Author(s):  
Fu Ke Wang ◽  
Chao Bin He
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Mechanical And Thermal Properties ◽  
Curing Agent ◽  
Solvent Exchange ◽  
Thermal And Mechanical Properties ◽  
Graphene Oxides ◽  
Curing Agents ◽  
Exchange Technique

The dispersion and exfoliation of graphene oxides in polymer matrix remains a challenge for graphene oxides based epoxy nanocomposites fabrication. In the present paper, we reported a simple and facile solvent exchange technique to successfully transfer graphene oxides (GOs) from aqueous solution to ethanol. In addition, we found that GO dispersion in epoxy resins was affected by the curing agents. Good dispersion of GOs in epoxy resin together with enhanced thermal and mechanical properties were observed when epoxy was cured with aliphatic curing agents. For aromatic curing agent, high loading of GOs leaded to GOs aggregation, but well dispersed GOs was observed at low loading of GOs. Especially, a 12 °C increase of glass transition temperature of the epoxy resin was observed with only 0.1 wt% GOs was added to the epoxy resin.

Curing behavior, thermal, and mechanical properties of epoxy resins cured with a novel liquid crystalline dicarboxylic acid curing agent

2013 ◽  
Vol 54 (3) ◽  
pp. 695-703 ◽  
Author(s):  
Le Hoang Sinh ◽  
Nguyen Ngoc Trung ◽  
Bui Thanh Son ◽  
Seunghan Shin ◽  
Dinh Tan Thanh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dicarboxylic Acid ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Curing Agent ◽  
Thermal And Mechanical Properties ◽  
Curing Behavior

scholarly journals Modified Epoxy Resin Synthesis from Phosphorus—Containing Polyol and Physical Changes Studies in the Synthesized Products

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2116 ◽  
Author(s):  
Jeong Beom Jang ◽  
Tae Hee Kim ◽  
Taeyoon Kim ◽  
Hye Jin Kim ◽  
Bongkuk Seo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Mechanical And Thermal Properties ◽  
Release Rates ◽  
Molding Compounds ◽  
Reinforced Plastics ◽  
Phosphorus Containing ◽  
Physical Changes ◽  
Modified Epoxy

Epoxy resins are commonly used to manufacture the molding compounds, reinforced plastics, coatings, or adhesives required in various industries. However, the demand for new epoxy resins has increased to satisfy diverse industrial requirements such as enhanced mechanical properties, thermal stability, or electrical properties. Therefore, in this study, we synthesized new epoxy resin (PPME) by modifying phosphorous-containing polyol. The prepared resin was analyzed and added to epoxy compositions in various quantities. The compositions were cured at high temperatures to obtain plastics to further test the mechanical and thermal properties of the epoxy resin. The measured tensile and flexural strength of epoxy compositions were similar to the composition without synthesized epoxy resin. However, the heat release rates of the compositions exhibited tendencies of a decrease proportional to the amount of PPME.

Applied Research of the Flexible Epoxy Resin Curing Agent

2012 ◽  
Vol 535-537 ◽  
pp. 2499-2502
Author(s):  
X. Wang ◽  
S. R. Zheng ◽  
R. M. Wang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Fracture Surface ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Applied Research ◽  
Curing Agent ◽  
Structural Adhesives ◽  
Resin Curing ◽  
The Impact

Epoxy resin structural adhesives modified by flexible curing agent. Dependening on the mechanical properties of epoxy resins on the flexible curing agent content was studied. The impact fracture toughness was discussed in terms of fracture surface fractography.

Study of Thermal Properties of Curing of DGEBA Epoxy Resin with Hexakis-(4-Aminophenoxy)-Cyclotriphosphazene

2011 ◽  
Vol 284-286 ◽  
pp. 365-368 ◽  
Author(s):  
Jing Zhu ◽  
Yong Wu ◽  
Lei Zhao ◽  
Hong Liang Wei ◽  
Hui Juan Chu ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Chemical Structure ◽  
Diglycidyl Ether ◽  
Flame Retardance ◽  
Curing Agent ◽  
Degradation Behaviors ◽  
Curing Agents

Hexakis-(4-aminophenoxy)-cyclotriphosphazene (PN-NH2) was synthesized through nucleophilic substitution of the chloride atoms of hexachlorocyclotriphosphazene (HCCP) and reduction of the nitro group, and its chemical structure was characterized. As a curing agents for commercial epoxy resin Diglycidyl ether of bisphenol-A (DGEBA) PN-NH2 was compared with conventional curing agents 4,4-diaminodiphenylsulfone(DDS) and 4,4-diaminodiphenylmethane (DDM). The thermal properties and thermal degradation behaviors of these thermosetted resins were investigated by using thermogravimetric analysis (TGA). TGA studies demonstrated that the thermal properties of the PN-NH2-containing cured epoxy resin were higher than those of others. The phosphorus-nitrogen containing curing agent can result in a great improvement of the flame retardance for their thermosetted epoxy resins.

scholarly journals Mechanical and thermal properties of triblock copolymer modified epoxy resins

BIBECHANA ◽  
2018 ◽  
Vol 16 ◽  
pp. 196-203 ◽  
Author(s):  
Shankar P Khatiwada ◽  
Sabu Thomas ◽  
Jean Marc Saiter ◽  
Ralf Lach ◽  
Rameshwar Adhikari
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resins ◽  
Triblock Copolymer ◽  
Mechanical Performance ◽  
Triblock Copolymers ◽  
Diglycidyl Ether ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Thermoset Resin ◽  
Modified Epoxy

We investigate the ways of improving thermal and mechanical properties of diglycidyl ether of bisphenol-A (DGEBA) based thermoset resin using diaminodiphenylsulphone (DDS) as hardener and using epoxidized polystyrene/polybutadiene-based triblock copolymers as modifier. The epoxidation was performed. The targeted chemical modification using meta-chloroperoxybenzoic acid (m-CPBA) of the copolymer was performed whereby the epoxidation of the butadiene chains mainly took place at 1,4 linkages. The modification copolymer was found to contribute in enhancing the mechanical performance of the blends with epoxy resin. The results indicated the formation of nanostructured morphology in the blends attributable to their enhanced impact strength.BIBECHANA 16 (2019) 196-203

Sustainable alternative to bisphenol A epoxy resin: high-performance recyclable epoxy vitrimers derived from protocatechuic acid

2020 ◽  
Vol 11 (27) ◽  
pp. 4500-4506 ◽  
Author(s):  
Yangqing Tao ◽  
Linxuan Fang ◽  
Menglu Dai ◽  
Caiyun Wang ◽  
Jing Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
High Performance ◽  
Protocatechuic Acid ◽  
High Efficiency ◽  
Thermal And Mechanical Properties ◽  
Naoh Solution

A series of epoxy vitrimers were prepared based on protocatechuic acid, which showed better thermal and mechanical properties than commercial BPA-based epoxy resins. The vitrimers can be reprocessed in high efficiency and degraded in NaOH solution.

Preparation and mechanical properties of thermosetting epoxy foams based on epoxy/ 2-ethyl-4-methylimidazol system with different curing agent contents

2017 ◽  
Vol 53 (6) ◽  
pp. 663-681 ◽  
Author(s):  
Jiantong Li ◽  
Guangcheng Zhang ◽  
Xiaolong Fan ◽  
Xun Fan ◽  
Lisheng Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Tensile Modulus ◽  
Crosslinking Density ◽  
Curing Agent ◽  
Foaming Process ◽  
Lower Tensile Strength ◽  
Scanning Electron ◽  
Thermosetting Epoxy

Epoxy/2-ethyl-4-methylimidazol system with different curing agent content was completely cured for foaming, and the effect of a systematic variation in 2-ethyl-4-methylimidazol content on the crosslinking density of cured epoxy resins was investigated. It was found that the crosslinking density of completed cured epoxy reduced as the 2-ethyl-4-methylimidazol content increased in certain range of contents (10–50 mol%). Then the precursors were foamed by a batch foaming process with supercritical carbon dioxide. The cellular morphologies of foamed epoxy resins were analyzed by scanning electron microscopy. The results revealed that the reduced crosslinking density would improve the foamability of cured epoxy resin. The microcellular epoxy foams could be obtained by maintaining a moderate crosslinking density, which can be controlled by varying 2-ethyl-4-methylimidazol content. For the completely cured epoxy with different curing agent content, when the crosslinking density of epoxy resin was 232.40 mol m–3 (the 2-ethyl-4-methylimidazol content was 35 mol%) or lower, microcellular structure was obtained by adjusting the foaming conditions. The effects of foaming on the mechanical properties were also discussed. The results indicated that microcellular epoxy foams had higher impact strength but lower tensile strength and tensile modulus, validating that the introduction of microcellular structure in epoxy matrix was conducive to the improvement of the ductility of epoxy foams.

Synthesis of a novel lignin‐based epoxy resin curing agent and study of cure kinetics, thermal, and mechanical properties

2021 ◽  
Vol 138 (23) ◽  
pp. 50523
Author(s):  
Bing Chen ◽  
Qiang Zhang ◽  
Mangeng Lu ◽  
Huifa Meng ◽  
Zhencai Qu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Cure Kinetics ◽  
Curing Agent ◽  
Thermal And Mechanical Properties ◽  
Resin Curing

The Mechanical Properties of Organic Modified Epoxy Resin

2020 ◽  
Vol 43 (3) ◽  
pp. 10-14
Author(s):  
Georgel MIHU ◽  
Claudia Veronica UNGUREANU ◽  
Vasile BRIA ◽  
Marina BUNEA ◽  
Rodica CHIHAI PEȚU ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Mechanical Tests ◽  
Organic Modification ◽  
Three Point Bending ◽  
Modified Epoxy

Epoxy resins have been presenting a lot of scientific and technical interests and organic modified epoxy resins have recently receiving a great deal of attention. For obtaining the composite materials with good mechanical proprieties, a large variety of organic modification agents were used. For this study gluten and gelatin had been used as modifying agents thinking that their dispersion inside the polymer could increase the polymer biocompatibility. Equal amounts of the proteins were milled together and the obtained compound was used to form 1 to 5% weight ratios organic agents modified epoxy materials. To highlight the effect of these proteins in epoxy matrix mechanical tests as three-point bending and compression were performed.

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