Polyphenol-Modified Polymeric Membrane for Durable Metal Adhesion
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Solution Overview
Problem
Metallized polymer films face issues with low interface adhesion and weak bonding strength due to the low surface tension of macromolecular polymer films, which is not effectively improved by traditional corona treatment, leading to unstable surface tension over time.
Innovation Solution
A polymeric polyphenol-modified polymer film is prepared by corona treating a polymer layer and applying a modifying liquid containing polyphenolic compounds and cross-linking agents, followed by drying, to create a modification layer with durable high surface tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If corona treatment is applied to increase surface tension of polymer films, then bonding strength between polymer and metal is improved, but surface tension becomes unstable and decreases over time
Solution Approach 1:
A polyphenol-modified layer is introduced as an intermediary between the polymer film and metal layer. This modification layer, containing polyphenolic compounds (such as tannic acid, gallic acid, or catechin) crosslinked with polyamine compounds, serves as a stable intermediate that maintains high surface tension over time, preventing the surface tension decay observed with conventional corona treatment alone.
Solution Approach 2:
The invention creates a composite structure consisting of the original polymer film, a polyphenol-modified intermediate layer, and a metal layer. The modification layer is formed by crosslinking polyphenolic compounds with polyamine compounds, creating a stable composite material that combines the advantages of both components while maintaining stable surface tension and strong bonding.
2Strength
If surface tension of polymer film is increased to match metal surface tension, then bonding strength is improved, but the improvement is limited and insufficient
Solution Approach 1:
The invention changes the chemical composition and molecular structure of the surface layer by introducing polyphenolic compounds and crosslinking them with polyamine compounds. This chemical modification fundamentally alters the surface properties, enabling surface tension to reach levels comparable to metal surfaces (greater than 100 mN/m), far exceeding the limited improvement achievable by physical corona treatment alone.
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 modified polymer film achieves stable bonding with high surface tension metal layers for extended periods, enhancing application scenarios and maintaining mechanical properties without significant decrease in surface tension.
Implementation Method 1
performing a corona treatment to a surface of the polymer layer
Implementation Method 2
applying a modifying liquid onto the surface of the corona-treated polymer layer
Data Source
AI summary
The present disclosure relates to the technical field of film material, and particularly to a polymeric polyphenol-modified polymer film, a preparation method thereof and a metallized polymer film. According to the present disclosure, corona treatment is performed to a surface of a polymer layer, so that a polar modifying liquid can uniformly coat the surface of the polymer layer, thereby forming a modification layer tightly combined with the polymer layer. Thus, the low-polarity polymer layer surface can be imparted with a durable high polarity. Consequently, the polymer layer is capable of being stably and tightly bonded to a material layer with high polarity and high surface tension, such as a metal layer, for a long period of time, effectively broadening the application scenarios for non-polar polymer substrate layers. By controlling the concentrations of the polyphenolic compound and the cross-linking agent in the modifying liquid, the modification layer formed by a cross-linking reaction can have a suitable cross-linking density and an adequate number of hydroxyl groups, thereby further effectively and stably enhancing the long-term polarity and surface tension of the polymer layer. The preparation method is simple and easy to operate, cost-effective, efficient, and easy to scale up.