PVDF-g-PSSA Membrane for Breath Analysis Water Pervaporation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current membranes for water pervaporation in breath analysis systems, such as those using Nafion®, are costly, fragile, and inefficient due to high water permeability and require complex manufacturing processes, while existing alternatives suffer from low flux and mechanical fragility.
Innovation Solution
A robust polymer substance, such as a membrane or tube, is developed with a polymer grafted using sulfonic groups, specifically poly(vinylidene fluoride)-graft-poly(styrene sulfonated acid) (PVDF-g-PSSA), which is designed for efficient water pervaporation with improved mechanical strength and ease of handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional membranes like Nafion® are used for water pervaporation, then high water permeability is achieved, but the membranes are costly and fragile with complex manufacturing processes
Solution Approach 1:
The patent uses composite materials by combining PVDF polymer matrix with grafted sulfonic acid groups to create a membrane that achieves both high water permeability and mechanical strength. The PVDF-g-PSSA composite structure provides the necessary robustness while maintaining pervaporation performance, eliminating the fragility issue of conventional membranes.
Solution Approach 2:
The patent changes the chemical parameters of the polymer by introducing sulfonic acid groups through grafting onto PVDF. This parameter change modifies the membrane's properties to achieve high water permeability without requiring expensive materials like Nafion®, thereby reducing cost while maintaining performance and improving mechanical reliability.
2Productivity
If membrane thickness is decreased to increase flux, then water removal efficiency improves, but mechanical strength and robustness decrease
Solution Approach 1:
The PVDF-g-PSSA composite material provides enhanced mechanical properties that allow the use of thinner membranes without sacrificing strength. The grafted sulfonic acid groups create a robust structure that maintains integrity even at reduced thickness, enabling high flux while preserving mechanical reliability.
3Productivity
If complex manufacturing processes are used to achieve high performance, then pervaporation efficiency improves, but ease of manufacture decreases
Solution Approach 1:
The patent achieves high pervaporation efficiency through parameter changes in the polymer structure (grafting sulfonic acid groups onto PVDF) rather than through complex multi-step manufacturing processes. This approach simplifies manufacturing while maintaining high water removal efficiency, making the membrane more ease of manufacture compared to conventional high-performance membranes.
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 substance achieves high water evaporation rates and mechanical stability, maintaining gas component concentrations during breath analysis, and is cost-effective with simplified manufacturing compared to traditional methods.
Implementation Method 1
The separation or removal of liquids, such as water, from gases, such as organic gases, is an important process within the chemical, petrochemical, medical and energy industries.
Implementation Method 2
Pervaporation is a process that involves a membrane in contact with a fluid (which may include gas and/or liquid) on a feed or upstream side and a vapor on the permeate or downstream side.
Implementation Method 3
The polymer substance achieves high water evaporation rates and mechanical stability
Data Source
AI summary
There is provided herein a dryer polymer substance comprising a polymer grafted with a compound having sulfonic groups, wherein the substance is adapted to pervaporate a fluid such as water, water vapor or both. There is further provided a process for the preparation of a dryer polymer substance adapted to pervaporate a fluid, the process includes processing a polymer into a desired form, activating at least a portion of the polymer, and grafting the activated portion of the polymer with a compound having groups adapted to be sulfonated.