Silsesquioxane Resin Composition for Thermal-Mismatch Crack Reduction
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Solution Overview
Problem
Existing resin compositions fail to adequately address shrinkage and cracking when exposed to high temperatures due to mismatched thermal expansion coefficients between substrates and cured products.
Innovation Solution
A resin composition incorporating silsesquioxane with specific thermal expansion coefficient ratios and absorbance parameters, ensuring 0.09≤Ia/Ib≤3.0 and 0.04≤Ic/Ib≤1.0, where Ia, Ib, and Ic represent absorbances from siloxane, hydrocarbon, and hydroxy groups, respectively, to minimize thermal shrinkage and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional resin composition is used, then the cured product can be formed, but it exhibits shrinkage and cracking at high temperatures due to thermal expansion mismatch with the substrate
Solution Approach 1:
The patent changes the chemical composition parameters of the resin system by incorporating silsesquioxane compounds with specific molecular structures (cyclic, linear, or crosslinked) and controlling the ratio of inorganic to organic components. This parameter adjustment modifies the thermal expansion coefficient of the cured resin to match the substrate, preventing shrinkage and cracking at high temperatures while maintaining structural integrity.
Solution Approach 2:
The patent creates a composite material system combining silsesquioxane (inorganic component) with organic resin components. This composite structure leverages the low thermal expansion coefficient of the silsesquioxane framework while incorporating organic modifiers to adjust flexibility and adhesion. The synergistic combination achieves thermal stability matching the substrate and prevents harmful thermal effects during curing and service.
2Stability of the object's composition
If the thermal expansion coefficient of the cured product is reduced to match the substrate, then thermal mismatch is minimized, but the formulation complexity increases due to multiple component ratios
Solution Approach 1:
The patent systematically adjusts formulation parameters including the type of silsesquioxane (cyclic vs. linear), the ratio of silsesquoxane to crosslinking agent, and the selection of co-resins. By changing these parameters within defined ranges, the thermal expansion coefficient is tuned to match the substrate while maintaining a manageable formulation process through established mixing and curing procedures.
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 cured product exhibits minimal thermal shrinkage and cracking at high temperatures, maintaining structural integrity by balancing inorganic and organic components and hydrophilicity.
Implementation Method 1
a cured product of a silsesquioxane-including resin composition
Implementation Method 2
the curable resin layer is formed by curing, for example, a curable resin composition including a polyhedral oligomeric silsesquioxane-based oligomer
Implementation Method 3
when the average thermal expansion coefficient of the cured product at 30 to 200° C. is expressed as α1 [K−1], at least one of requirements α1/α2≥10 and (α1−α2)2×108≥0.4 is satisfied
Implementation Method 4
an absorbance derived from a siloxane bond in which two silicon atoms are bonded to one oxygen atom, an absorbance derived from a hydrocarbon group, and an absorbance derived from a hydroxy group are respectively expressed as Ia, Ib, and Ic, the absorbances being determined by attenuated total reflection using a Fourier transform infrared spectrophotometer
Data Source
AI summary
A cured product of a resin composition according to the present invention includes at least silsesquioxane. When the average thermal expansion coefficient of the cured product at 30 to 200° C. is expressed as α1 [K−1], at least one of requirements α1/α2≥10 and (α1−α2)2×108≥0.4 is satisfied, where a reference value α2 is 350×10−6 [K−1] or less. In the cured product, an absorbance derived from a siloxane bond, an absorbance derived from a hydrocarbon group, and an absorbance derived from a hydroxy group are respectively expressed as Ia, Ib, and Ic, the absorbances being determined by attenuated total reflection using a Fourier transform infrared spectrophotometer. In this case, requirements 0.09≤Ia/Ib≤3.0 and 0.04≤Ic/Ib≤1.0 are satisfied.