Liquid Crystalline Epoxy with Side-Chain Mesogen for Heat Conduction
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Solution Overview
Problem
Conventional liquid crystalline epoxy compounds with epoxy groups at both terminals of mesogens form three-dimensional network structures during curing, which weakens the aligned one- or two-dimensional structure and limits heat conductivity, making it difficult to achieve high heat radiation properties without degrading other physical properties.
Innovation Solution
A liquid crystalline epoxy compound with an epoxy group positioned at a side chain of the mesogen group, connected through a flexible linkage, allowing for a highly aligned structure that maintains regular mesogen orientation and enhances heat transfer without forming a three-dimensional network structure during curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxy groups are positioned at both terminals of mesogen groups to form three-dimensional network structures during curing, then durability and anti-corrosive properties are improved, but heat conductivity deteriorates due to phonon scattering
Solution Approach 1:
The patent divides the molecular structure into distinct functional segments: mesogen groups positioned at the center provide structural alignment and thermal conductivity, while epoxy groups are separated and positioned at terminal positions to provide curing functionality. This segmentation allows the mesogen-rich central region to maintain aligned one-dimensional structures for heat conduction while terminal epoxy groups form the necessary crosslinked network for durability without disrupting the central mesogen alignment.
Solution Approach 2:
The patent applies different structural characteristics to different regions of the molecule: the central region contains mesogen groups with flexible linkages that promote one-dimensional alignment and thermal conductivity, while the terminal regions contain epoxy groups that form crosslinked networks for mechanical durability. This local differentiation allows simultaneous optimization of heat conductivity in the central region and reliability in the terminal regions.
2Temperature
If filler content is increased to improve heat conductivity, then heat radiation properties are improved, but manufacturing complexity and other physical properties deteriorate
Solution Approach 1:
The patent enables the epoxy resin system to self-provide heat conductivity through its intrinsic molecular structure. The mesogen groups with flexible linkages create aligned one-dimensional structures that naturally conduct heat without requiring external fillers. This self-service approach eliminates the need for complex filler processing and mixing operations while achieving high heat radiation properties.
Solution Approach 2:
The patent changes the molecular parameters of the epoxy resin system by introducing mesogen groups with specific flexible linkages (such as alkyl chains with 1-20 carbon atoms). This parameter change transforms the resin from a conventional three-dimensional network structure to a system capable of forming aligned one-dimensional structures, thereby inherently improving heat conductivity without adding fillers.
3Temperature
If conventional liquid crystalline epoxy compounds are used to form aligned structures, then heat conductivity is improved, but the aligned structure is weakened during curing due to three-dimensional network formation
Solution Approach 1:
The patent segments the molecular architecture such that mesogen groups remain concentrated in the central region while epoxy groups are positioned at terminals. This segmentation ensures that during curing, the central mesogen region maintains its aligned one-dimensional structure for heat conduction, while terminal epoxy groups form the crosslinked network for durability without interfering with central alignment stability.
Solution Approach 2:
The patent introduces flexible linkages as intermediary structures between the mesogen groups and the epoxy groups. These flexible linkages act as mediators that allow the mesogen groups to maintain their aligned configuration while still enabling the epoxy groups to participate in crosslinked network formation. The flexible linkages prevent rigid constraints from propagating from terminal epoxy groups back to the central mesogen region.
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
This approach results in improved heat conductivity and moldability, enabling high heat radiation with minimal filler content and maintaining excellent physical properties, thus addressing the limitations of conventional epoxy resins in electronic devices.
Implementation Method 1
vibratory transfer of phonons between mesogens occurs in the same direction, thereby providing high heat conductivity
Implementation Method 2
Such a liquid crystalline epoxy resin forms a cured resin product having an aligned structure through the strong interaction between mesogens
Implementation Method 3
a network polymer formed by ring opening of an epoxy group occurring when an epoxy compound having at least two epoxy groups in its molecule is mixed with a curing agent
Data Source
AI summary
Disclosed is a liquid crystalline epoxy compound wherein an epoxy group is positioned at a side chain of the longer direction of a mesogen group and each of the mesogen group and the epoxy group is connected to the center of the molecular structure through a flexible linkage. Since the liquid crystalline epoxy compound includes an epoxy group positioned at a side chain of the longer direction of a mesogen group and each of the mesogen group and the epoxy group is connected to the center of the molecular structure through a flexible linkage, the interaction between the mesogens in a cured resin product occurs significantly without weakening even after curing, thereby improving the heat conductivity of the resin compound through the active heat transfer between the mesogens.