Polyimide Fluoropolymer Membrane High-Temperature Oleophobicity
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Solution Overview
Problem
Current oleophobic membranes degrade at high operational temperatures, limiting their performance in applications such as liquid separation and venting in various industries.
Innovation Solution
Development of high-performance oleophobic membranes comprising polyimide fibers encased in a fluoropolymer sheath, which form a permeable mat with an oil contact angle greater than 90 degrees at temperatures above 100°C, utilizing electrospinning to produce fibers with diameters ranging from 10 nm to 50 microns and subsequent fluoropolymer coating for enhanced stability and oleophobicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oleophobic membranes are used, then they provide initial oleophobic performance, but they degrade at high operational temperatures
Solution Approach 1:
The patent uses a composite structure consisting of polyimide fibers as the base material and fluoropolymer coating as the oleophobic layer. This composite material combines the high-temperature stability of polyimide with the superior oleophobic properties of fluoropolymers, enabling the membrane to maintain performance at temperatures above 100°C where conventional single-material membranes degrade.
Solution Approach 2:
The patent modifies the chemical composition parameters of the membrane by incorporating fluorinated polyimide fibers and coating with fluoropolymer. This parameter change in material composition provides sustained oleophobicity at elevated temperatures, transforming the membrane from temperature-sensitive to temperature-resistant while maintaining oleophobic functionality.
2Object-affected harmful factors
If porous membranes are used for bubble removal, then they provide hydrophobicity, but they lack sustained oleophobicity at high temperatures
Solution Approach 1:
The patent applies different properties to different parts of the membrane system: the polyimide fiber structure provides porosity for bubble removal, while the fluoropolymer coating provides localized oleophobicity. This local quality differentiation allows the membrane to simultaneously achieve bubble removal functionality and sustained oleophobic performance at high temperatures.
Solution Approach 2:
The patent utilizes porous polyimide fiber mats as the substrate structure, which enables gas bubble removal through the porous network. The pores allow bubbles to pass through while the fluoropolymer coating on the fiber surfaces maintains oleophobic properties, creating a material that combines bubble removal capability with high-temperature oleophobic stability.
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 membranes exhibit sustained oleophobicity and mechanical strength, maintaining performance at elevated temperatures with improved oil contact angles and mechanical properties, such as tensile strength and modulus, ensuring stability and effectiveness in high-temperature applications.
Implementation Method 1
The membrane has an oil contact angle of greater than about 90 degrees at a temperature above about 100° C.
Implementation Method 2
utilizing electrospinning to produce fibers with diameters ranging from 10 nm to 50 microns
Data Source
AI summary
There is provided a membrane that includes a plurality of polyimide fibers encased in a fluoropolymer sheath, the plurality of fibers having a diameter of from about 10 nm to about 50 microns, wherein the plurality of fibers form a permeable non-woven mat. A method of manufacturing the membrane is provided.