Fluoropolyether Polymer Phenylene Linker Chucking Properties
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Solution Overview
Problem
Existing fluoropolyether-containing polymers with hydrolyzable silyl groups struggle to form cured films with high water/oil repellency and chucking properties, leading to slippage and poor machining accuracy.
Innovation Solution
A fluoropolyether-containing polymer with a linker unit containing a phenylene group and a silanol or hydrolyzable silyl group at the end of the molecular chain, which forms a surface treating agent capable of creating a cured coating with improved water/oil repellency, slipping, and chucking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolyether-containing polymer with hydrolyzable silyl group is used to form cured film, then water/oil repellency is improved, but chucking properties deteriorate causing slippage and poor machining accuracy
Solution Approach 1:
The patent applies local quality by introducing a phenylene group specifically in the linker unit between the fluoropolyether chain and the silane group. This localized structural modification in the middle portion of the molecule enhances chucking properties through improved substrate adhesion, while the fluoropolyether terminal groups maintain water/oil repellency. The phenylene group's rigid aromatic structure provides better mechanical interlocking with substrates, resolving the contradiction between repellency and chucking.
Solution Approach 2:
The patent creates a composite molecular structure combining fluoropolyether groups (for water/oil repellency), phenylene linker units (for enhanced adhesion and chucking), and hydrolyzable silyl groups (for substrate bonding). This composite approach integrates multiple functional moieties into a single polymer molecule, allowing simultaneous achievement of water/oil repellency and improved chucking properties that neither component could achieve alone.
2Reliability
If fluoropolyether-containing polymer with hydrolyzable silyl group is coated on substrate, then water/oil repellency is achieved, but adhesion to substrate deteriorates
Solution Approach 1:
The phenylene group in the linker unit serves as an intermediary between the fluoropolyether chain and the hydrolyzable silyl group. This aromatic mediator provides a rigid, planar structure that enhances mechanical interlocking with the substrate while maintaining the flexibility needed for the silane to form strong chemical bonds. The phenylene linker thus mediates between the non-adhesive fluoropolyether terminus and the adhesive silane group, resolving the adhesion contradiction.
Solution Approach 2:
The patent applies local quality by positioning the phenylene group specifically in the linker region of the molecule. This localized aromatic structure provides enhanced substrate interaction and adhesion strength at the interface region, while the fluoropolyether terminal groups maintain their water/oil repellency function. The spatial localization of the phenylene group in the linker unit allows differential functionality across the molecule.
3Ease of operation
If phenylene group is introduced in linker unit, then chucking properties and adhesion are improved, but molecular complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the linker unit to include a phenylene group. This structural parameter change transforms the linker from a simple aliphatic chain to an aromatic structure, which provides enhanced rigidity, planarity, and substrate interaction. The phenylene group's sp2 hybridized carbons create a more rigid, flat structure that improves mechanical interlocking and adhesion, accepting the increased molecular complexity as necessary for achieving superior chucking properties.
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 polymer achieves enhanced substrate adhesion and chucking properties, particularly for lens substrates, while maintaining low coefficients of dynamic friction and high abrasion resistance.
Implementation Method 1
In the presence of airborne moisture or the like, the hydrolyzable silyl groups undergo self-condensation reaction to form a coating. The hydrolyzable silyl groups form chemical and physical bonds with the surface of substrates
Implementation Method 2
the hydrolyzable silyl groups undergo self-condensation reaction
Implementation Method 3
silane coupling agents are well known for their ability to bond surfaces of glass or fabric substrates to organic compounds
Implementation Method 4
fluoropolyether-containing compounds exhibit, by virtue of their extremely low surface free energy, water/oil repellency
Data Source
AI summary
A cured coating film having an excellent water and oil repellency, an excellent slipperiness, and excellent chucking properties can be formed by a surface treatment agent that contains: a fluoropolyether group-containing polymer having at least one group represented by formula (1) at at least one terminal of the molecule (In the formula, Y is a divalent organic group containing an o-, m-, or p-phenylene group; R is a C1-4 alkyl group or a phenyl group; each X is independently a hydroxyl group or hydrolyzable group; and a is 2 or 3.), and/or a partial (hydrolysis) condensate of this polymer.