Diterminally Silanol-Modified Perfluoropolyether for Moisture-Stable Bonds
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Solution Overview
Problem
Perfluoropolyether compounds with C—O—Si bonds are prone to breakdown in the presence of moisture or alcohol, leading to durability issues.
Innovation Solution
A diterminally silanol-modified perfluoropolyether compound is developed, which forms Si—O—Si bonds when reacted with a reactive silicon compound, enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If C—O—Si bonds are used to link perfluoropolyether compound with silane coupling agent, then functional groups can be introduced and copolymerization can occur, but the bonds break down in the presence of moisture or alcohol leading to poor durability
Solution Approach 1:
The patent changes the chemical bond type from C—O—Si to Si—O—Si by modifying the perfluoropolyether compound to have silanol groups at both ends. This parameter change in bond chemistry fundamentally improves durability while maintaining functional group introduction capability, as Si—O—Si bonds are resistant to hydrolysis and alcohol attack.
Solution Approach 2:
The silanol-modified perfluoropolyether compound acts as an intermediary that first forms stable Si—O—Si bonds with silicon compounds, then provides functional groups for subsequent copolymerization with reactive monomers. This intermediary approach separates the bonding function from the functionalization function, allowing each to be optimized independently.
2Ease of manufacture
If transesterification reaction is used to link perfluoropolyether compound with silane coupling agent, then C—O—Si bonds are formed, but the resulting compound lacks durability in alcohol and water
Solution Approach 1:
The patent converts the potential harm of using simple transesterification reactions into a benefit by first creating silanol groups that then undergo condensation to form highly stable Si—O—Si bonds. The initial ease of manufacture is preserved in the first step, while the second step provides the durability benefit, turning a potentially weak process into a robust two-step methodology.
3Adaptability or versatility
If perfluoropolyether compound with terminal C—OH structure is used as starting material, then reaction with silane coupling agent can proceed, but the C—O—Si bonds formed are unstable in moisture and alcohol
Solution Approach 1:
Instead of forming C—O—Si bonds directly from terminal C—OH groups, the patent inverts the approach by first creating silanol groups (Si—OH) on the perfluoropolyether compound, which then condense to form Si—O—Si bonds. This inversion of the bonding strategy fundamentally improves stability while maintaining reactivity, as the silanol groups remain reactive toward both silane coupling agents and for subsequent functionalization.
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 compound exhibits superior durability and stability, particularly in the presence of alcohol and water, making it suitable as a synthetic intermediate.
Implementation Method 1
combination with a reactive silicon compound enables the perfluoropolyether compound and the reactive silicon compound to be joined by Si—O—Si bonds (siloxane bonds)
Implementation Method 2
in the presence of moisture or alcohol, the C—O—Si bonds in such prior-art perfluoropolyether compounds break down to C—OH and RO—Si
Data Source
AI summary
Diterminally silanol-modified perfluoropolyether compounds of the general formula (1)(wherein each R1 is independently an unsubstituted divalent hydrocarbon group of 1 to 10 carbon atoms, each R2 is independently a substituted or unsubstituted monovalent hydrocarbon group of 1 to 10 carbon atoms, Rf is a perfluoropolyether group, and ‘n’ is independently at each occurrence an integer from 0 to 8) are provided. Such compounds, when reacted as an intermediate with a reactive silicon compound, afford compounds of excellent durability.