Dual-Layer Membrane Interfacial Adhesion via Fluoro-Substituted Modifier
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Solution Overview
Problem
Dual-layer membranes face issues with weak interlayer adhesion due to miscibility gaps and differences in mechanical properties, leading to delamination and reduced separation performance, which hinders their development and application.
Innovation Solution
A dual-layer membrane is prepared using a high molecular weight polymer with an imide structure and another with a carbonyl group or ether bond, modified with a fluoro-substituted aromatic amine monomer, enhancing miscibility and intermolecular interactions to achieve excellent interfacial adhesion through a co-casting or co-extrusion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual-layer membranes are prepared by co-casting or co-extrusion technique, then the preparation process is simplified and production cycle is reduced, but interlayer adhesion is weak leading to delamination
Solution Approach 1:
A modifier containing special functional groups is introduced as an intermediary substance between the two polymer layers. This modifier acts as a chemical bridge that enhances intermolecular interactions at the interface between the first polymer layer and the second polymer layer, thereby improving interlayer adhesion without complicating the one-step preparation process
Solution Approach 2:
The chemical composition and molecular structure parameters of the polymer layers are modified by incorporating the modifier with special functional groups. This changes the intermolecular interaction parameters at the interface, transforming weak adhesion into strong adhesion while maintaining the simplicity of the co-casting or co-extrusion process
2Adaptability or versatility
If polymer materials with different mechanical properties are used for different layers, then layer-specific performance is optimized, but miscibility gap increases causing delamination
Solution Approach 1:
The modifier serves as a chemical intermediary that mediates between polymers with different mechanical properties. It contains functional groups that can interact with both the first polymer and the second polymer, creating a chemical bridge that reduces the miscibility gap and prevents delamination while allowing each layer to maintain its optimized mechanical properties
Solution Approach 2:
The invention creates a composite structure at the interface between the two polymer layers by incorporating the modifier. This composite interface region combines the characteristics of all three components (first polymer, modifier, second polymer) to achieve both layer-specific performance optimization and improved miscibility
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 method results in dual-layer membranes with improved interfacial adhesion and reduced mass transfer resistance, extending their application in liquid and gas separation with enhanced separation performance and prolonged service life.
Implementation Method 1
a polymer modified with a monomer containing special functional groups... enhancing miscibility and intermolecular interactions
Implementation Method 2
applying the first solution and the second solution in a manner of overlapping each other, followed by phase inversion, to obtain a separation membrane
Data Source
AI summary
A dual-layer membrane and a method for preparing thereof. By adding a modifying monomer containing an active group and a characteristic group to a dope solution or spinning solution during the preparation of the dual-layer membrane, the grafting reaction occurs between the active group of the monomer and the polymer in the dope solution or spinning solution, and the intermolecular interaction with other polymers is enhanced by the characteristic group of the monomer, to improve the miscibility between the polymers. The method is suitable for preparing both a dual-layer flat sheet membrane and a dual-layer hollow fiber membrane, and can realize the preparation of a dual-layer membrane with an interpenetrated structure at the interface under mild preparation conditions.