1、Synthesis of urethane
In this study, flexible aliphatic epoxy incorporating urethane linkages was synthesized through an eco-friendly non-isocyanate route utilizing CO 2 (Scheme 1 a). The synthesized aliphatic epoxy was crosslinked with rigid aromatic epoxy (DGEBA) to tune the mechanical properties.
2、EPOXY RESINS｜ADEKA
The ADEKA Group's chemical products. Epoxy resins,conventional epoxy resin,special type epoxy resin
3、Study on Blending Modification of Bisphenol A Epoxy
TripathiG [7] et al. studied the blend toughening of bisphenol A type epoxy resin, carboxy-terminated butadiene-acrylonitrile and aliphicyclic epoxy resin and proposed that blends can significantly improve the physical and mechanical properties and heat resistance of epoxy system.
Synthesis of urethane
In this study, flexible aliphatic epoxy incorporating urethane link-ages was synthesized through an eco-friendly non-isocyanate route utilizing CO2 (Scheme 1a).
Enhancing the comprehensive performance of bisphenol A epoxy resin via
In this study, a tetra-functional bio-based epoxy resin was utilized to blend with a bisphenol A-based epoxy resin system, and the resultant resins were comprehensively evaluated using various methods.
Studies on the Modification of Commercial Bisphenol
Given the insufficient number of publications pertaining to strength alterations from chemical modification of epoxy systems, this research aims to elucidate this relationship.
Dynamic Mechanical and Chemorheology Analysis for the Blended Epoxy
In this study, the bio-based polyurethane (PU) modified resin was adopted to modify the pure bisphenol-A epoxy by blending method with various proportions.
Synthesis and thermal properties of urethane
Abstract A urethane-containing epoxy resin was successfully synthesized by reacting bisphenol A with 1,6-hexamethylene diisocyanate and epichlorohydrin. The chemical structure of urethane-containing epoxy resin was confirmed using FT-IR, 1 HNMR, and elemental analysis.
Journal of Applied Polymer Science
With the aim to improve the toughness of epoxy resin, polyol and polyurethane are synthesized using bisphenol-Z (BPZ). The synthesized material is dispersed in the epoxy resin and used as a toughening agent.
Synthesis and characterization of PPG
To confirm the degree of improvement in impact resistance as an adhesive, a urethane modified epoxy adhesive was prepared by mixing a digylcidyl ether bisphenol A (DGEBA) with curing agent and curing accelerator.
In the field of modern materials science, epoxy resins are widely utilized across various industries due to their excellent mechanical properties, chemical stability, and electrical insulation. Among these, urethane-modified bisphenol A epoxy resin (UMBARE) stands out as a high-performance composite material, demonstrating significant potential in industrial applications due to its unique physicochemical properties.
UMBARE is synthesized by incorporating urethane segments into the structure of bisphenol A epoxy resin, enhancing its thermal stability, water resistance, and chemical resistance. This modification not only improves the physical properties of the resin but also endows it with superior environmental adaptability, enabling it to maintain exceptional performance under extreme conditions.
Firstly, the thermal stability of UMBARE is remarkably improved. Traditional bisphenol A epoxy resins tend to degrade at high temperatures, leading to performance degradation or failure. The addition of urethane segments effectively reduces the resin’s thermal decomposition temperature, allowing it to retain robust properties in high-temperature environments. This characteristic is critical for applications requiring heat resistance and reliability, such as in aerospace, automotive manufacturing, and energy sectors.
Secondly, UMBARE exhibits significantly enhanced water and chemical resistance. While bisphenol A epoxy resin inherently resists water and most chemicals, it may still degrade under specific conditions. The introduction of urethane segments strengthens the resin’s defense against moisture and select chemicals, prolonging material lifespan and reducing maintenance costs.
Additionally, UMBARE demonstrates outstanding mechanical properties. By adjusting the length and distribution of urethane segments, parameters such as hardness, toughness, and impact resistance can be precisely tailored. This makes UMBARE highly suitable for applications demanding strength and flexibility, including construction infrastructure, bridge engineering, and high-performance automotive components.
Another key advantage of UMBARE is its superior processability. Compared to unmodified bisphenol A epoxy resins, UMBARE exhibits better fluidity in molten states, facilitating molding and processing for mass production. Furthermore, its cured structure boasts high cohesive strength and low water absorption, contributing to improved product quality and performance.
UMBARE also has limitations. For instance, its relatively high cost and potential raw material supply constraints may restrict adoption in certain fields. Additionally, its UV resistance is generally inferior to unmodified bisphenol A epoxy resins, limiting outdoor applications.
To address these challenges, researchers are exploring strategies such as optimizing synthesis routes, refining resin formulations, and developing novel fillers or additives to enhance performance. Efforts are also underway to improve UV resistance, expanding the scope of outdoor applications.
UMBARE has emerged as a standout material in modern materials science due to its exceptional thermal stability, water/chemical resistance, mechanical properties, and processability. Despite challenges, ongoing technological advancements position UMBARE to play a pivotal role in future industrial applications, driving innovation and progress in materials science.
