Furan-Based Amine Curing Agents for Epoxy Thermosets
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Solution Overview
Problem
Current biobased epoxy systems derived from renewable resources face challenges in achieving superior thermomechanical and water barrier properties, particularly with furan-based epoxy/amine thermosets that exhibit poor glass transition temperature and water resistance.
Innovation Solution
Development of furan-based di- and tetra-amine compounds through acidic condensation of aldehydes with furfuryl amine, which are used as curing agents in epoxy thermosets, enhancing thermomechanical and water barrier properties when reacted with diglycidyl ether of bisphenol A.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aromatic amine hardeners (MDA, DETDA) are used, then superior thermomechanical properties are achieved, but the materials are non-renewable and toxic
Solution Approach 1:
The patent modifies the chemical structure of amine hardeners by replacing conventional aromatic structures with furan-based heterocyclic structures containing nitrogen. This structural parameter change maintains the thermomechanical performance while achieving renewability from biomass resources and reducing toxicity, as demonstrated by the superior properties of furan-based diamines compared to traditional hardeners
Solution Approach 2:
The invention uses biomass-derived furan compounds as temporary or renewable resources that can be converted into durable curing agents. The furan-based amine hardeners serve as sustainable alternatives to petroleum-based aromatic amines, providing similar performance but with renewable feedstocks and reduced environmental harm
2Object-affected harmful factors
If furanyl based curing agents are used, then renewable and eco-friendly properties are achieved, but poor glass transition temperature and water barrier properties result
Solution Approach 1:
The patent creates composite molecular structures by combining furan heterocyclic units with amine functional groups in specific configurations. The furan-based diamine compounds integrate the renewable furanyl building blocks with curing functionality, producing a composite material that simultaneously achieves eco-friendliness and superior thermomechanical properties including elevated glass transition temperature and enhanced water barrier performance
Solution Approach 2:
The invention introduces specific structural features at local positions within the furan-based curing agent molecules, such as strategic placement of amine groups and substitution patterns on the furan rings. These localized structural modifications optimize the curing reaction and network formation, resulting in improved glass transition temperature and water barrier properties while maintaining the renewable furan backbone
3Strength
If furfuryl amine condensation products are synthesized, then improved thermomechanical properties are achieved, but complex synthesis procedures are required
Solution Approach 1:
The patent divides the synthesis process into distinct sequential stages: first condensing furfuryl amine with aldehydes to form intermediate difuran diamine compounds, then optionally performing further condensation to generate tetrafuran tetraamine products. This segmented approach allows each reaction step to be optimized independently and simplifies process control while achieving the desired complex molecular structures with superior thermomechanical properties
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 use of these furan-based amine compounds results in epoxy thermosets with improved thermomechanical properties and reduced water uptake, offering a more sustainable alternative to traditional aromatic amine hardeners.
Implementation Method 1
The present invention relates to various furan based di- and tetra-amines made using acidic condensation of aldehydes with furfuryl amine
Implementation Method 2
The epoxy thermosets made with these amines showed superior thermomechanical and water barrier properties when cured with diglycidyl ether of bisphenol A (DGEBA)
Data Source
AI summary
The present invention relates novel furan based amine cross-linkers with improved thermomechanical and water barrier properties. The novelty of this invention is the use of aromatic, and hydrophobic aliphatic aldehydes to bridge two furfuryl amines, which yields a diamine or tetra amines with a significantly enhanced hydrophobic character. These diamine cross-linkers exhibit enhanced water barrier properties and thermomechanical properties when cured with both commercial and synthetic epoxies.