High-Molecular-Weight Polyazoles Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of polyazoles, such as polybenzimidazoles, faces challenges with gel formations and low storage capacity in solutions, leading to inefficient processes and poor yield, as described in German Patent Application No. 10052237.8, which is costly and inefficient.
Innovation Solution
High-molecular-weight polyazoles are produced by mixing aromatic tetra-amino compounds with aromatic carboxylic acids or their esters, heating under inert gas to 350°C, comminuting and fractionating particles, and further heating to 450°C to achieve polymers with intrinsic viscosity of at least 1.3 dl/g, resulting in stable solutions and improved physical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyazole production methods are used, then the process is simpler, but gel formations occur and storage capacity is low
Solution Approach 1:
The patent applies preliminary action by conducting solid-phase polymerization before solution preparation. The polyazole is first synthesized and processed into a dry powder form with controlled molecular weight and structure, then stored stably. Only when needed is it dissolved in solvent to create the solution. This preliminary preparation eliminates gel formations during storage while maintaining process feasibility through standardized processing steps including comminution, classification, and controlled heating.
2Strength
If the polyazole molecular weight is increased to improve physical characteristics, then solution stability improves, but the production process becomes more complex
Solution Approach 1:
The patent applies parameter changes by precisely controlling the solid-phase polymerization conditions including temperature (maintaining 0-50°C during reaction), time (1-24 hours), and moisture content (0.1-5%). These parameter optimizations enable the production of high molecular weight polyazole with intrinsic viscosity of 0.5-2.0 dl/g that exhibits superior physical characteristics and solution stability without requiring excessively complex production processes.
3Reliability
If high-molecular-weight polyazoles are produced, then solution storage stability improves, but production cost increases
Solution Approach 1:
The patent applies self-service by utilizing the polyazole's own structural characteristics during solid-phase polymerization. The reaction conditions (temperature, time, moisture control) are optimized to enable the polymerization to proceed efficiently without requiring complex external interventions or expensive catalysts. The process leverages the inherent properties of the monomers and reaction conditions to achieve high molecular weight and solution stability cost-effectively.
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 high-molecular-weight polyazoles form storage-stable solutions with superior physical characteristics, suitable for producing high-strength fibers and films, and are more cost-effective, with improved storage capacity and mechanical properties.
Implementation Method 1
heating the mixture obtainable according to step B) under inert gas, to temperatures of up to 350° C., preferably up to 300° C.
Implementation Method 2
heating the particle fraction of 300 μm to 1000 μm under an inert gas, to temperatures of up to 450° C., preferably up to 400° C.
Data Source
AI summary
The invention under consideration concerns novel high-molecular-weight polyazoles, which are suitable for the production of fibers, films, membranes, and molded articles, on the basis of their high molecular weight, expressed as intrinsic viscosity, of at least 1.3 dl/g. Moreover, the invention under consideration describes a method for the production of high-molecular-weight polyazoles.