High Heat Epoxide Compounds for Resin Toughness
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Solution Overview
Problem
Epoxy resins exhibit brittleness due to high crosslink density, which compromises their mechanical toughness, and existing methods struggle to balance heat resistance with ductility and low viscosity for efficient production processes.
Innovation Solution
Development of high-purity, high-heat epoxide compounds with controlled crosslink density, achieved through the use of more rigid difunctional epoxides and a process involving epichlorohydrin and a base, resulting in low viscosity and improved thermal performance without brittleness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high crosslink density is used to improve heat resistance, then thermal performance is improved, but mechanical toughness deteriorates due to brittleness
Solution Approach 1:
The patent changes the chemical structure parameters of the epoxy monomers by introducing rigid aromatic groups and controlling the crosslink density through specific monomer selection. This allows achieving high heat resistance (Tg ≥ 200°C) while maintaining mechanical toughness by optimizing the balance between crosslink density and molecular rigidity.
Solution Approach 2:
The patent creates a composite network structure by combining rigid aromatic epoxy monomers with appropriate curing agents. This composite approach at the molecular level achieves both high thermal performance and improved mechanical properties by distributing stress more effectively throughout the cured resin network.
2Temperature
If high purity epoxides are used to improve thermal performance, then heat resistance is improved, but viscosity increases making processing difficult
Solution Approach 1:
The patent selects specific epoxy monomers with controlled molecular weight and structure (rigid aromatic groups with epoxide functionalities) that inherently provide low viscosity even at high purity levels. The molecular structure is designed to prevent excessive chain entanglement while maintaining thermal performance.
Solution Approach 2:
The patent introduces rigid aromatic groups at specific positions in the molecular structure rather than throughout the entire chain. This localized rigidity provides thermal performance enhancement without causing excessive viscosity increase, as the rigid groups are strategically placed to maintain molecular flexibility where needed.
3Ease of operation
If difunctional epoxides are used to reduce viscosity, then processability is improved, but crosslink density control becomes challenging
Solution Approach 1:
The patent uses difunctional epoxy monomers with specific structural parameters (rigid aromatic groups, controlled molecular weight) that provide low viscosity while maintaining appropriate reactivity. The epoxide equivalent weight and molecular structure are carefully selected to achieve the desired balance between processability and crosslink density in the cured network.
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 solution provides epoxy resins with enhanced thermal and mechanical properties, including high glass transition temperatures and ductility, suitable for applications like aerospace and electronics, while maintaining low viscosity for efficient production and encapsulation.
Implementation Method 1
a process involving epichlorohydrin and a base
Data Source
AI summary
High purity epoxide compounds methods for preparing the high purity epoxide compounds, and compositions derived from the epoxide compounds are provided. Also provided are materials and articles derived from the epoxide compounds.