Polymetalloxane Film Formation via Controlled Hydrolysis
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Solution Overview
Problem
Current methods for forming metal oxide films, such as titanium oxide or zirconium oxide, face challenges in achieving industrially viable thickness due to low film forming rates and aggregation issues during hydrolysis, leading to incomplete polymerization and crack formation in the resulting films.
Innovation Solution
A polymetalloxane with a specific constituent unit, including an (R33SiO—) group, is synthesized through controlled hydrolysis and polycondensation, allowing for higher molecular weight polymers that remain soluble and form homogeneous, crack-resistant films with high refractive index and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal alkoxide is hydrolyzed in a solvent to form polymetalloxane, then high refractive index and transparency are achieved, but the hydrolysate aggregates and becomes insoluble, preventing homogeneous film formation
Solution Approach 1:
The patent changes the molecular structure parameters of the polymetalloxane by controlling the hydrolysis degree and introducing specific organic groups (R1-R6) with varying steric effects and hydrophobicity. By adjusting parameters such as the ratio of hydrolyzed alkoxy groups, the presence of silane groups, and the carbon chain length of organic substituents, the patent achieves a balance between maintaining solubility in organic solvents and achieving high transparency in the cured film.
Solution Approach 2:
The patent creates a composite molecular structure combining metalloxane units with organic groups (R1-R6) that have different properties. The composite structure includes hydrophobic alkyl groups, sterically bulky groups, and potentially silane-functionalized groups, which work together to prevent aggregation while maintaining the high refractive index and transparency characteristics of metal oxide films.
2Stability of the object's composition
If hydrolysis is carried out under special conditions to prevent aggregation, then solubility is maintained, but the degree of hydrolysis is low and numerous alkoxy groups remain, leading to crack generation during film formation
Solution Approach 1:
The patent optimizes the hydrolysis parameters including water to metal alkoxide molar ratio, reaction temperature, and catalyst selection to achieve a controlled degree of hydrolysis. The patent specifies that R1 represents a hydrolyzed alkoxy group and requires at least one R1 to be present, ensuring sufficient hydrolysis while preventing complete hydrolysis that would cause aggregation. This controlled partial hydrolysis maintains both solubility and film-forming ability.
Solution Approach 2:
The patent introduces local structural variations by allowing different organic groups (R1-R6) at different positions of the metalloxane structure. Specifically, R1 (hydrolyzed alkoxy) and R2 (remaining alkoxy or metalloxane bond) can be distributed in different ratios, creating local heterogeneity that prevents crystallization and aggregation while maintaining overall solubility and film homogeneity.
3Temperature
If vapor phase method such as CVD is used to form metal oxide film, then high heat resistance and high transparency are achieved, but the film forming rate is low and industrially usable thickness cannot be obtained
Solution Approach 1:
The patent replaces the vapor phase deposition mechanism (CVD) with a solution-based coating method. Instead of using chemical vapor deposition requiring high temperatures and long deposition times, the patent uses liquid polymetalloxane solutions that can be applied by conventional coating techniques (spin coating, dip coating, spray coating), dramatically increasing the film forming rate while maintaining the heat resistance properties through subsequent curing.
Solution Approach 2:
The patent changes the physical state parameter of the metal oxide precursor from gaseous (CVD) to liquid solution form. By controlling the molecular weight, solubility, and reactivity of the polymetalloxane in solution, the patent enables rapid coating at room temperature or mild heating conditions, achieving high productivity while the curing process maintains the high heat resistance characteristic of metal oxide films.
4Quantity of substance
If water amount is increased to promote hydrolysis, then hydrolysis degree increases, but precipitation occurs due to aggregation of hydrolysate
Solution Approach 1:
The patent changes the solvent system parameters by selecting specific organic solvents with appropriate polarity, boiling points, and coordinating ability. The patent also adjusts the water to metal alkoxide ratio, reaction temperature, and adds catalysts to promote hydrolysis at lower water concentrations. These parameter changes enable high hydrolysis degree (at least one R1 present) without reaching the aggregation threshold that causes precipitation.
Solution Approach 2:
The patent uses organic solvents and catalysts as intermediaries to facilitate the hydrolysis reaction without requiring excess water. The solvent acts as a medium that stabilizes the hydrolysate intermediates, preventing aggregation, while the catalyst accelerates the hydrolysis rate, enabling high conversion at controlled water levels.
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 polymetalloxane solution stably exists in organic solvents, enabling the formation of high-transparency, high-refractive-index films with improved heat resistance and reduced cracking, suitable for electronic components and optical applications.
Implementation Method 1
a method in which a metal alkoxide is hydrolyzed in a solvent, followed by polycondensation to form a polymetalloxane
Implementation Method 2
a method in which a metal alkoxide is hydrolyzed in a solvent, followed by polycondensation to form a polymetalloxane
Data Source
AI summary
Disclosed is a polymetalloxane including a constituent unit represented by the following general formula (1), which stably exists in a transparent and uniform state in a solution and can form a homogeneous cured film:wherein R1 is an organic group and at least one of R1 is an (R33SiO—) group, R3 is optionally selected from specific groups, R2 is optionally selected from specific groups, when plural R1, R2, and R3 exist, they may be the same or different, M represents a specific metal atom, m is an integer indicating a valence of a metal atom M, and a is an integer of 1 to (m−2).