Sol-Gel Synthesis of Co-ABPBI Membranes
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Solution Overview
Problem
Conventional methods for preparing ABPBI membranes are cumbersome, involve corrosive solvents, and result in powder formation instead of films, lacking mechanical strength and tunable acid content.
Innovation Solution
A sol-gel process synthesizing co-ABPBI membranes using 3,4-diaminobenzoic acid, tetramine, and rigid dicarboxylic acid in polyphosphoric acid as a solvent, allowing direct membrane casting without evaporation steps and enabling tunable acid content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional solution casting method is used with MSA solvent, then membrane can be formed, but corrosive solvent evaporation is required and process complexity increases
Solution Approach 1:
The patent combines polymerization and membrane casting into a single integrated process. The ABPBI polymer is synthesized directly in the membrane support structure, eliminating the need for separate solution casting and solvent evaporation steps. This merging of synthesis and fabrication resolves the technical contradiction by simplifying the manufacturing process while maintaining membrane formation capability.
Solution Approach 2:
The patent extracts and eliminates the corrosive MSA solvent from the process by using an alternative polymerization method that does not require strong acid solvents. The polymerization is conducted in a manner that allows direct film formation without the need for corrosive solvent evaporation, thereby removing the harmful element while preserving the membrane formation function.
2Productivity
If ABPBI is synthesized in PPA solvent, then polymerization can proceed, but membrane casting results in powder formation instead of films
Solution Approach 1:
The patent introduces a membrane support structure as an intermediary medium that enables direct film formation from the PPA-based polymerization reaction. The support structure acts as a template that guides the polymerization process to form a continuous film rather than powder, thereby resolving the contradiction between maintaining polymerization efficiency in PPA and achieving proper membrane film formation.
Solution Approach 2:
The patent changes the physical parameters of the polymerization system by conducting the reaction directly on a support surface rather than in bulk solution. This parameter change transforms the outcome from powder formation to film formation, allowing the use of PPA solvent for efficient polymerization while achieving the desired membrane film structure.
3Reliability
If multiple process steps are used for ABPBI membrane preparation, then polymer quality can be controlled, but process time and complexity increase
Solution Approach 1:
The patent merges multiple sequential steps (polymerization, isolation, dissolution, casting, and doping) into a single integrated process where ABPBI is synthesized directly in the membrane support. This consolidation maintains polymer quality control through the inherent stability of the one-pot synthesis method while dramatically reducing process time by eliminating intermediate isolation and re-dissolution steps.
Solution Approach 2:
The patent performs the polymerization action preliminarily within the final membrane structure itself, rather than preparing the polymer separately and then assembling it into the membrane. This preliminary action within the target structure eliminates subsequent assembly steps and reduces overall process time while maintaining quality through controlled in-situ synthesis.
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 process produces membranes with excellent mechanical strength and tunable acid content, reducing the complexity of conventional methods and avoiding powder formation, suitable for electrochemical devices and gas separations.
Implementation Method 1
A sol gel process synthesizing co-ABPBI membranes using 3,4-diaminobenzoic acid, tetramine, and rigid dicarboxylic acid in polyphosphoric acid as a solvent
Implementation Method 2
The process produces membranes with excellent mechanical strength and tunable acid content
Data Source
Figure 1a~2
Figure 3~4
AI summary
Disclosed herein is co-ABPBI membranes comprising co-ABPBI of formula (I), Invention discloses a sol gel process for the synthesis of membranes comprising co-ABPBI of formula (I).