Bis-Schiff Base Compositions Viscosity Stability
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Solution Overview
Problem
Conventional bis-Schiff base compositions have high melt viscosity and instability, leading to rapid increases in viscosity and gelation during processing, making them unsuitable for large-scale production and application in molding or coating processes.
Innovation Solution
Development of chemical compositions with a structure of Formula (I), comprising aromatic moieties, which exhibit low melt viscosity and stability over a wider temperature and time range, allowing for processing without undesirable reactions, using a neat polymerizable resin with minimal additives and a solvent for improved rheological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional bis-Schiff base compositions are heated to achieve appropriate viscosity for processing, then the viscosity becomes malleable enough to manipulate, but the compositions undergo further reactions, polymerizing and/or crosslinking which results in rapid increases in viscosity and gelation
Solution Approach 1:
The patent modifies the chemical structure of bis-Schiff bases by selecting specific aromatic aldehydes and aromatic amines with particular substituent patterns (e.g., meta-substitution, specific electron-donating or electron-withdrawing groups). These structural parameter changes result in compositions that maintain stability at processing temperatures while achieving appropriate viscosity, preventing the polymerization and crosslinking reactions that plague conventional compositions.
2Reliability
If aromatic aldehydes with polyaromatic moieties are used to improve stability, then the compositions become more stable, but they become more difficult to process due to higher melting points
Solution Approach 1:
The patent applies local quality by strategically placing specific functional groups and substituent patterns at particular positions on the aromatic rings. For example, using meta-substitution patterns and specific electron-donating groups at certain positions creates local electronic and steric environments that simultaneously enhance stability and reduce melting points, improving processability without sacrificing compositional stability.
Data Source
AI summary
A chemical formulation having at least one solvent and a chemical having the structure of Formula (I):where R includes at least one aromatic moiety, and X and X′ may both or independently include an aromatic moiety, an aliphatic moiety, or a hydrogen.