Functional TFE Copolymer Expansion for Adhesion
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Solution Overview
Problem
There is a need for TFE copolymer materials with functional groups that impart specific chemical properties while maintaining the properties of expanded TFE copolymers, which are characterized by nodes interconnected by fibrils, and allowing for subsequent controlled reactions to modify these properties further.
Innovation Solution
The development of functional TFE copolymers comprising TFE and at least one comonomer with pendant functional groups, which are expanded to form microporous structures with a specific microstructure, and subsequent reactions to alter the functional groups and enhance properties such as adhesion and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If plasma treatment of microporous ePTFE is performed to introduce functional groups, then surface functionality and adhesion are improved, but molecular weight decreases due to chain scission and functionality is restricted to chain ends
Solution Approach 1:
The patent applies preliminary action by incorporating functional comonomers during the polymerization stage before expansion. This allows functional groups to be distributed throughout the polymer chains rather than introduced later via plasma treatment, avoiding chain scission and molecular weight degradation while achieving the desired surface functionality.
Solution Approach 2:
The patent uses functional comonomers as intermediaries to introduce desired chemical properties. These comonomers serve as mediators that provide functional groups (such as carboxylic acid, amine, or hydroxyl groups) during polymerization, enabling subsequent adhesion and compatibility without requiring aggressive post-treatment that would damage the polymer structure.
2Stability of the object's composition
If functional comonomers are incorporated during polymerization, then functional groups are distributed throughout the polymer structure, but adhesion and compatibility with other materials must still be optimized
Solution Approach 1:
The patent applies local quality by allowing different regions of the expanded PTFE structure to exhibit different properties. The functional groups distributed throughout the polymer chains can selectively interact with different materials at different locations, providing localized adhesion and compatibility enhancement while maintaining the overall structural integrity of the expanded material.
Solution Approach 2:
The patent creates composite functionality by combining PTFE base polymer with functional comonomers. This composite approach at the molecular level results in a material that exhibits both the desirable properties of PTFE (chemical resistance, low friction) and the adhesive/compatibility properties of the functional groups, achieving multi-functionality in a single material system.
3Strength
If microporous ePTFE is stretched to improve strength and reduce cold flow, then mechanical properties are enhanced, but surface energy and chemical properties remain unchanged
Solution Approach 1:
The patent merges two previously separate processes into one: the mechanical expansion process and the functionalization process. By incorporating functional comonomers during polymerization before expansion, the patent achieves both mechanical enhancement (through stretching to create microporous structure) and chemical property modification (through functional group distribution) in a single integrated material system.
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 approach allows for the creation of TFE copolymers with enhanced chemical and physical properties, enabling improved adhesion and compatibility with other materials, while maintaining the structural integrity and functional characteristics of the expanded TFE copolymers.
Implementation Method 1
stretching (expansion) processes in which the paste-extruded extrudate, after removal of extrusion aid lubricant, is stretched to produce porous, strong products
Implementation Method 2
The expanded functional TFE copolymer comprising pendant functional groups is reacted so that said initial pendant functional groups form secondary functional groups that are different from said initial pendant functional groups
Data Source
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AI summary
A functional TFE copolymer fine powder is described, wherein the TFE copolymer is a polymer of TFE and at least one functional comonomer, and wherein the TFE copolymer has functional groups that are pendant to the polymer chain. The functional TFE copolymer fine powder resin is paste extrudable and expandable. Methods for making the functional TFE copolymer are also described. The expanded functional TFE copolymer material may be post-reacted after expansion.