Mesogenic Epoxy Resin Smectic Structure Fracture Toughness
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Solution Overview
Problem
Mesogen-containing epoxy resins face challenges with high viscosity, which affects ease of handling and fracture toughness, and the addition of solvents can lead to void formation during curing.
Innovation Solution
Incorporating an epoxy compound with at least two mesogenic structures and a divalent biphenyl group, which forms a smectic structure upon curing, enhancing thermal conductivity and fracture toughness while maintaining low viscosity, achieved through specific molecular structures and synthesis methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a mesogen-containing epoxy resin is used to improve heat conductivity and fracture toughness, then thermal performance and mechanical strength are enhanced, but viscosity increases and fluidity during processing deteriorates
Solution Approach 1:
The patent modifies the molecular structure parameters of the epoxy compound by incorporating specific mesogenic groups (such as biphenyl, terphenyl, or cyclohexylbenzene structures) and controlling the number of epoxy groups per molecule. This structural parameter change enables the resin to form liquid crystalline phases with optimized viscosity characteristics, achieving both high fracture toughness and improved fluidity during processing
Solution Approach 2:
The patent creates a composite molecular structure combining mesogenic groups with epoxy functional groups in a single molecule. This composite structure allows the resin to exhibit both the mechanical strength characteristics of crosslinked networks and the flow properties of liquid crystalline phases, resolving the contradiction between toughness and fluidity
2Ease of operation
If a solvent is added to a mesogen-containing epoxy resin to improve fluidity, then ease of handling is enhanced, but void formation occurs during curing and product quality deteriorates
Solution Approach 1:
The patent extracts and eliminates the solvent component from the system by designing an alicyclic mesogen-containing epoxy resin that inherently possesses low viscosity and high fluidity without requiring any solvent additives. This removal of the solvent eliminates the source of void formation during curing while maintaining excellent ease of handling
Solution Approach 2:
The patent replaces the temporary solvent (which must be evaporated or remains as defects) with a permanent molecular structure modification that provides lasting low viscosity. The alicyclic mesogenic structure itself becomes the viscosity-control mechanism, eliminating the need for disposable or temporary additives
3Strength
If the molecular weight of the epoxy compound is increased to improve fracture toughness, then mechanical strength is enhanced, but viscosity increases and processing difficulty arises
Solution Approach 1:
The patent segments the molecular structure into distinct functional units: alicyclic mesogenic groups for structural integrity and toughness, and epoxy functional groups for crosslinking. This segmentation allows the molecule to achieve high molecular weight and toughness while the liquid crystalline phase formation maintains low viscosity and ease of processing
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 epoxy resin composition exhibits improved ease of handling and fracture toughness with reduced viscosity, forming a smectic structure that enhances thermal conductivity and mechanical properties.
Implementation Method 1
Incorporating an epoxy compound with at least two mesogenic structures and a divalent biphenyl group, which forms a smectic structure upon curing
Data Source
AI summary
An epoxy resin, comprising an epoxy compound having at least two mesogenic structures and at least one divalent biphenyl group.