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、Advances in Toughening Modification Methods for Epoxy Resins: A
This work provides a comprehensive review of the recent advancements in the toughening modification methods for epoxy resins.
3、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.
4、Enhancing strength, toughness, and flame retardancy of epoxy resins
This study presents a breakthrough in epoxy resin toughening using a novel approach: incorporating isophorone diisocyanate (IPDI) modified naringenin (IPNA) to create an in-situ interpenetrating network (IPN) with a one-pot method alongside DDM.
5、Study on the toughening of epoxy resin modified by multi‐component
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...
Enhancing the mechanical strength and toughness of epoxy resins with
Glass transition temperature (Tg) always deteriorates while improving the strength of epoxy resins which inherently suffer from brittleness. Herein, novel linear polyhedral oligomeric silsesquioxane (POSS)-epoxy nano-modifiers are synthesized with variable contents of POSS.
A Critical Review: The Modification, Properties, and
Experimental results on modified epoxy resins are collectively summarized, which focus on the structure, curing, and alternate methods for modification of epoxy resins.
Advances in Toughening Modification Methods for Epoxy Resins: A
Through a detailed analysis of experimental studies, this paper highlights the effectiveness of various toughening strategies and suggests future research directions aimed at further optimizing epoxy resin toughening techniques for diverse industrial applications.
Toughness and its mechanisms in epoxy resins
Here, we especially focused on the recent progress in toughening methods and associated mechanisms for these epoxy resins and analytic techniques for characterizing toughness, which highlighted the applicable approaches to generate homogeneous structures.
Study on Curing Kinetics and Toughening Modification of Epoxy Resin
A series of reinforced and toughed curing epoxy resins (EPs) were prepared by incorporating nano SiO 2 and the flexible 1,4-butanediol diglycidyl ether (1,4-BDDE) into the DGEBA/BPF system and mixed uniformly through high speed vacuum defoaming.
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.
