Aramid-Based Epoxy Resin for Enhanced Interface Bonding Strength
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Solution Overview
Problem
Aramid fibers have low surface activity and poor wettability due to their structural features, leading to low interface bonding strength with resin matrices, which limits their application in composite materials.
Innovation Solution
Aramid-based epoxy resin is prepared by reacting aramid powder with a metallization reagent to introduce reactive functional groups, followed by a ring-opening reaction with epoxy chloropropane, enhancing the surface polarity and reactivity of the aramid fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface modification is performed on aramid to improve wettability, then interface bonding strength is improved, but manufacturing complexity increases
Solution Approach 1:
The invention performs preliminary surface modification on the aramid fibers before composite fabrication. The fibers are pre-treated with oxidizing agents and grafting reactions to introduce reactive groups, so that when the composite is manufactured, the fibers are already primed for strong bonding with the resin matrix, simplifying the overall manufacturing process.
Solution Approach 2:
The invention applies surface modification only to the outer surface layer of the aramid fibers rather than the bulk material. This localized treatment introduces reactive functional groups at the fiber-matrix interface while preserving the excellent mechanical properties of the bulk fiber, achieving improved bonding without excessive complexity.
2Strength
If benzene ring structure is present in aramid molecular chain, then high strength and high temperature resistance are achieved, but reaction activity of amide group deteriorates due to steric hindrance and conjugation effect
Solution Approach 1:
The invention segments the aramid molecular structure by introducing side-chain functional groups that separate the rigid benzene ring backbone from the reactive amide groups. This segmentation allows the backbone to maintain high strength and temperature resistance while the side chains provide accessible reactive sites for chemical modification and bonding.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting aramid-based epoxy resin exhibits improved tensile strength, impact resistance, and bending strength when added to a bisphenol A-type epoxy resin, simplifying the preparation process and reducing viscosity while maintaining high reactivity.
Implementation Method 1
allowing aramid powder as a raw material to react with a metallization reagent; grafting a plurality of ethylene oxide (EO) or propylene oxide (PO) or a mixture thereof to an activated amide group of the aramid
Implementation Method 2
conducting a ring-opening and closure reaction by using epoxy chloropropane (ECH), to obtain a liquid aramid-based epoxy resin
Implementation Method 3
The resulting aramid-based epoxy resin exhibits improved tensile strength, impact resistance, and bending strength when added to a bisphenol A-type epoxy resin
Data Source
AI summary
The present invention discloses an aramid-based epoxy resin and a method of making same, including the steps of reacting aramid fiber powder as a raw material with a metallization reagent; grafting a plurality of ethylene oxide, propylene oxide or a mixture thereof to an activated amide group of the aramid to introduce a reactive functional group hydroxyl; and then conducting a ring-opening and closing reaction by using epichlorohydrin to obtain a liquid aramid-based epoxy resin.