1、Water diffusion and swelling stresses in highly crosslinked epoxy
The present work investigates the swelling induced stresses arising in two epoxy systems during water uptake. The analysed systems are two epoxy resin based on DGEBA monomer and DGEBF monomer respectively, both fully cured by DDS amine.
2、Water in Epoxy Coatings: Basic Principles of Interaction with
This review describes the interaction of epoxy coatings with water, the kinetics of water uptake in epoxy resins, and the methods of studying the latter (gravimetric, IR (Infrared) and NMR (Nuclear magnetic resonance) spectroscopies).
3、Mechanism of Moisture Diffusion, Hygroscopic Swelling, and Adhesion
diameter of a kinetic water molecule is just 3.0 Å, moisture can easily traverse into the epoxy via the nanopores. They found that the volume fraction of nanopores does not affect the diffusion coefficient of water in any of the resin studied and argued that polar groups coincident with the nanopores are the rate-limiting factor in the dif
4、(PDF) Water in Epoxy Coatings: Basic Principles of Interaction with
This review describes the interaction of epoxy coatings with water, the kinetics of water uptake in epoxy resins, and the methods of studying the latter (gravimetric, IR (Infrared) and...
Moisture induced swelling in epoxy moulding compounds
However, the epoxy matrix of the molding compounds tends to absorb water molecules and subsequently exhibits a swelling behavior which is unique to the chemistry of the epoxy.
Water diffusion and swelling stresses in highly crosslinked
The present work investigates the swelling induced stresses arising in two epoxy systems during water uptake. The analysed systems are two epoxy resin based on DGEBA monomer and DGEBF monomer respectively, both fully cured by DDS amine.
Improvement of anti
To solve problems like poor solvent swelling resistance and micropore formation during the solidification and shrinkage of epoxy resin coatings, NCC was modified with a silane coupling...
An Experimental and Computational Study on Moisture Induced Epoxy
Moisture induced epoxy swelling is a potential failure mechanism in nonhermetic packages. Epoxy materials used in the package absorb moisture and swell in a relatively humid environment. This will result in hygroscopic stresses in the material that can eventually lead to failure.
Water
This study rigorously explores the water-induced failure mechanisms in polymeric coatings, highlighting both visible signs of degradation, such as corrosion, cathodic delamination, and blistering, and less apparent phenomena like hydrolysis, swelling, and plasticization.
Influence of Self
Based on the molecular structure–activity relationship, this study developed a novel waterborne epoxy–cement-based composite repair material using self-synthesized waterborne epoxy resin (WEP). The mechanism by which WEP improves the performance of cement-based materials was elucidated.
In modern materials science, epoxy resin is widely utilized in electronics, construction, and automotive industries due to its exceptional adhesive properties, electrical insulation, and chemical stability. when applied in specific environments such as underwater or humid conditions, a critical question arises: Does modified epoxy resin exhibit water-induced swelling characteristics? This article aims to explore this issue and analyze the water absorption and swelling behavior of modified epoxy resin from multiple perspectives.
1. What Is Modified Epoxy Resin?
Modified epoxy resin is derived from standard epoxy resin but enhanced through the addition of specific additives or specialized processing to improve its performance in challenging environments. These additives may include hydrophilic monomers, crosslinking agents, catalysts, etc., which enhance water resistance, corrosion resistance, and adhesion to substrates.
2. Water Absorption and Swelling Characteristics
Under dry conditions, modified epoxy resin typically exhibits excellent mechanical and electrical properties. its physical properties alter upon exposure to moisture, leading to volumetric swelling. This phenomenon can be explained by:
- Moisture Absorption: Hydrophilic groups within the resin interact with water molecules, increasing internal moisture content and causing volume expansion.
- Stress Relaxation: As water is absorbed, internal stresses reduce, allowing microcracks (caused by stress concentration) to expand, further promoting swelling.
- Chemical Reactions: Some modified epoxy resins contain water-reactive components (e.g., hydroxyl or carboxyl groups) that form hydrogen bonds or other chemical bonds with water, significantly increasing volume.
3. Key Factors Affecting Swelling Behavior
Not all modified epoxy resins swell when exposed to water. This depends on:
- Resin Formulation: Specially crosslinked resins remain structurally stable even after water absorption.
- Density: If the resin’s density is lower than water, buoyancy may cause partial swelling, but overall volume changes are minimal.
- Environmental Conditions: Temperature, humidity, and light accelerate swelling rates in high-temperature or humid settings.
4. Practical Implications
The water-swelling behavior of modified epoxy resin is critical in applications where material integrity and safety are prioritized. Engineers must:
- Account for swelling risks in design.
- Select resins with optimized formulations for specific environments.
- Implement protective measures (e.g., waterproof coatings) to mitigate swelling effects.
Modified epoxy resin does exhibit water-induced swelling, but the extent varies based on formulation, processing, and environmental factors. Researchers and engineers must thoroughly understand these variables to ensure safe and effective application of the material. By controlling or leveraging its swelling properties, modified epoxy resin can maintain performance in demanding environments.
