1、Study on Modification of Epoxy Resin Reinforcing Adhesive Commonly Used
Epoxy resin reinforcing adhesive has become the most commonly used reinforcing adhesive in the aerospace field because of its wide bonding range, high bonding s
2、Research status of mechanical modification of epoxy resin
In order to better meet the specific application requirements, various modification studies and technological developments have been conducted for epoxy resins.
3、Modification and Study on the Properties of Epoxy Resin
During the practical design and manufacture, the microstructural optimization and performance enhancement utilizing modification technology with regard to epoxy resin as a hot topic for current research still needs further research and exploration.
4、Study on the toughening of epoxy resin modified by multi
Abstract The present study investigates the effects of carbon nanofibers (CNF), nano-silica (SiO2) and short carbon fibers (SCF) on the tensile strength and fracture toughness of cured epoxy resins...
5、Study on toughening modification of epoxy resin and its properties of
Abstract The extremely cross-linked structure of the cured epoxy resin makes it fragile. This work toughened the N,N-diglycidyl-4-glycidyloxyaniline (AFG-90H)/methyl nadic anhydride (MNA)/2-ethyl-4-methylimi-dazole (2E4MZ) resin matrix with different curing agent and epoxy resin.
Research progress on modification of phenolic resin
With the widening of the application fields of phenolic resins, many types of modifiers have been used to modify the molecular structure of phenolic resins.
Study on modification of epoxy resins with acrylate liquid rubber
The modification of epoxy resins with acrylate liquid rubber containing pendant epoxy groups was studied. The acrylate liquid rubber was synthesized by copolymerization of ethyl acrylate,...
Study on the modification of epoxy resin adhesive with calcium carbonate
Employing bending, tensile-shear, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) tests, the impacts of the particle size and content of calcium carbonate on the properties of the epoxy resin adhesive were investigated.
(PDF) Synthesis and Modifications of Epoxy Resins and Their Composites
This article is designed to review the developments in synthesis, modifications, and properties of epoxy monomers derived from both petroleum and renewable resources.
Study on modification of epoxy resins with acrylate liquid rubber
ADS Study on modification of epoxy resins with acrylate liquid rubber containing pendant epoxy groups Kong, Jie ; Ning, Rongchang ; Tang, Yusheng Publication: Journal of Materials Science
In the field of modern materials science, epoxy resins have become indispensable matrix materials in numerous engineering applications due to their excellent mechanical properties, electrical insulation, and chemical stability. their inherent limitations, such as a relatively high coefficient of thermal expansion and significant brittleness, restrict their use in more demanding environments. To overcome these drawbacks, scientists have consistently dedicated efforts to modifying epoxy resins, aiming to achieve superior comprehensive performance.
Research on epoxy resin modification begins with an understanding of its molecular structure. Epoxy resins are high-molecular-weight polymers synthesized through the polymerization of multifunctional compounds with phenolic or amino compounds. This structure endows them with strong adhesive properties, chemical resistance, and mechanical strength. it also results in disadvantages such as a high coefficient of thermal expansion and susceptibility to fracture.
To reduce the thermal expansion coefficient of epoxy resins, researchers have employed various methods. A common approach involves using fillers with low thermal expansion coefficients, such as quartz powder or calcium borate. These fillers effectively fill voids within the resin, minimizing volumetric changes and thereby lowering the overall thermal expansion coefficient. Another method involves adjusting the molecular structure of the resin. For instance, introducing monomers with lower thermal expansion coefficients or altering reaction conditions to control the regularity of molecular chains can influence the final material's thermal expansion behavior.
Beyond reducing the thermal expansion coefficient, modifications to enhance mechanical strength and toughness are also critical. This typically involves cross-linking treatments, where chemical bonds are introduced between molecular chains to increase structural stability and tensile strength. The selection and dosage of cross-linking agents, such as polyisocyanates, polyepoxides, or polyvinyl aromatics, are crucial for achieving this goal.
In addition to physical modifications, chemical modifications of epoxy resins represent a significant research direction. By incorporating specific functional groups or elements, new properties such as flame retardancy, electrical conductivity, or self-healing capabilities can be imparted. For example, introducing elements like phosphorus, bromine, or nitrogen can enhance flame retardancy, while carboxylic or amino groups can enable electrical conductivity.
the microstructure of epoxy resins profoundly impacts their properties. By controlling synthesis parameters such as reaction temperature, time, and catalysts, epoxy resins with varying microstructures can be produced. These structural differences affect crystallinity, compatibility, and ultimately performance. Thus, tuning the microstructure of epoxy resins allows for the design of composites with tailored properties.
The study of epoxy resin modification is an interdisciplinary field, encompassing chemistry, physics, and materials science. With ongoing advancements in new materials technologies, it is anticipated that innovative methods and techniques will continue to emerge, expanding and deepening the applications of modified epoxy resins across diverse domains.
