1、Graft Modification of Epoxy Resin with Cyclohexamine
The fundamental principle of cyclohexamine-grafted epoxy resin involves chemical reactions between cyclohexamine and epoxy resin, introducing new functional groups into the resin chains to improve its chemical and physical properties.
2、Graft Modification of Epoxy Resins
In this paper, a novel modified epoxy resin with an interpenetrating network structure for use as a grouting material with high toughness was prepared by a method of graft copolymerization between polyurethane prepolymer (PUP) trimer and epoxy resin (E-44).
3、Graft modification of cellulose: Methods, properties and applications
In this review, the recent progresses on the synthesis and applications of cellulose graft copolymers are focused. Cellulose is a polysaccharide and its molecular weight depends on its sources as well as the extraction conditions for the purification.
Modification of Epoxy Resin with Cycloaliphatic
Modification of Epoxy Resin with Cycloaliphatic-Epoxy Oligosiloxane for Light-Emitting Diode (LED) Encapsulation Application. A novel cycloaliphatic-epoxy oligosiloxane (EHDM) was incorporated into 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (ERL-4221) for use as a light-emitting diode (LED) encapsulant.
Modification of Epoxy Resin with Cycloaliphatic
The experimental results demonstrated that the cured EHDM-10 hybrimer with 10 pph of EHDM relative to ERL-4221 maintained the neat ERL-4221 epoxy transmittance of 85% at 450 nm.
Effects of graft modification on mechanical properties of epoxy resin
In summary, all grafted epoxy resin samples exhibited enhancements in Young’s Modulus and Glass Transition Temperature, except for those grafted with Maleic Anhydride. However, a notable downside observed in grafted epoxy was embrittlement.
MODIFICATION OF EPOXY RESINS WITH PHENOLIC HYDROXYL
Phenolic hydroxyl-terminated polysiloxanes were incorporated into epoxy resins to reducethe internal stress owing to the mismatch in coefficient of thermal expansion (CTE).Polysiloxane-epoxy resin block copolymers were made by a pre-reaction step prior to thecuring.
Modification of epoxy resin with polyether
Polyether-grafted-polysiloxane (FPMS) and epoxy-miscible polysiloxane particles (EMPP) were prepared to improve the toughness of epoxy resin. The chemical structures of the products were characterized by FTIR, 1 H NMR, 29 Si NMR, and gel permeation chromatography (GPC).
Study on Chemical Graft Structure Modification and Mechanical
In this work, the solubility of the synthesized oligomer polyimide in organic solvents was greatly increased by combining three methods, thereby allowing the formation of ink for photocuring 3D printing, and the ink can be stacked to form low-shrinkage polyimide with complex controllable shape.
Grafting modification of epoxidized natural rubber with poly(ethylene
A novel comb-like polymer was synthesized via grafting epoxidized natural rubber (ENR) with polyethylene glycol (PEG) monomethylether carboxylic acid (mPEG-COOH), and the grafting reaction was studied by variable-temperature Fourier transform infrared (FTIR) spectroscopy.
Epoxy resin, as one of the high-performance materials, is widely used in fields such as electronics and electrical engineering, architectural coatings, automotive manufacturing, and aerospace due to its excellent mechanical properties, electrical insulation, chemical resistance, and dimensional stability. the molecular structure of epoxy resin limits its potential applications under specific conditions, such as performance degradation at high temperatures or in strong alkaline environments. To overcome these limitations, researchers have developed methods for grafting cyclohexamine onto epoxy resin. This paper aims to explore the principles, preparation methods, and application prospects of cyclohexamine-grafted epoxy resin.
The fundamental principle of cyclohexamine-grafted epoxy resin involves chemical reactions between cyclohexamine and epoxy resin, introducing new functional groups into the resin chains to improve its chemical and physical properties. This modification typically occurs through reactions between cyclohexamine and the hydroxyl groups of epoxy resin, forming stable cyclohexamine-modified resins. By adjusting the ratio of cyclohexamine to epoxy resin, reaction conditions, and post-processing techniques, the degree of grafting can be controlled to optimize the performance of the epoxy resin.
Various methods exist for preparing cyclohexamine-grafted epoxy resin, including solution polymerization, suspension polymerization, and emulsion polymerization. In solution polymerization, cyclohexamine is dissolved in an organic solvent, followed by the addition of an initiator to trigger the ring-opening polymerization of epoxy resin. In suspension polymerization, cyclohexamine is dispersed in a water-based medium, and polymerization is initiated. For emulsion polymerization, epoxy resin and cyclohexamine are copolymerized into an emulsion, which is then cured to form a solid resin.
Cyclohexamine-grafted epoxy resin offers several advantages. First, the introduction of cyclohexamine significantly enhances the thermal stability and alkali resistance of the resin. For example, under high-temperature conditions, cyclohexamine-grafted epoxy resin maintains better mechanical properties and electrical insulation, whereas unmodified epoxy resin degrades due to thermal decomposition. Second, the modified resin exhibits excellent corrosion resistance, maintaining stable performance in harsh environments. Additionally, the incorporation of cyclohexamine increases the viscosity of the resin, improving its applicability in coatings.
Cyclohexamine-grafted epoxy resin shows broad application potential across multiple fields. In electronics and electrical engineering, it can be used to manufacture high-performance circuit boards and encapsulation materials, enhancing product reliability and lifespan. In architectural coatings, this modified resin improves weather resistance and abrasion resistance, extending the lifespan of buildings. In automotive manufacturing, it serves as a high-performance adhesive and sealant, boosting the durability and safety of automotive components. In aerospace, the resin can be employed to fabricate structural components with high temperature resistance and mechanical strength, meeting stringent material requirements.
Despite its advantages, the preparation of cyclohexamine-grafted epoxy resin is relatively complex, costly, and requires specialized processing techniques to ensure optimal performance. reducing production costs, simplifying preparation procedures, and further improving the resin’s properties remain active research topics. With advancements in science and technology, cyclohexamine-grafted epoxy resin is expected to play a more significant role in the field of materials science.
