FDCA Polyester with Cyclohexanedimethanol for Stable Tg
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Solution Overview
Problem
Conventional polyester compositions based on terephthalic acid exhibit varying glass transition temperatures with composition changes, making them unsuitable for applications requiring stable thermal properties.
Innovation Solution
A polyester composition comprising 70-100 mole % of 2,5-furandicarboxylic acid or its ester, 0-30 mole % of aromatic dicarboxylic acid residues, and 0-30 mole % of aliphatic dicarboxylic acid residues, combined with 1-99 mole % of 1,4-cyclohexanedimethanol and 1-99 mole % of modifying glycols, which maintains a stable glass transition temperature across a wide range of compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cyclohexanedimethanol is added to terephthalic acid-based polyester to increase glass transition temperature, then the glass transition temperature increases, but the glass transition temperature becomes unstable and varies with composition changes
Solution Approach 1:
The patent changes the chemical parameter of the dicarboxylic acid from terephthalic acid to 2,5-furandicarboxylic acid (FDCA). This parameter change fundamentally alters the polymer's thermal behavior, enabling the glass transition temperature to remain stable (within ±2°C) across a wide range of cyclohexanedimethanol compositions (1-99 mole%), whereas terephthalic acid-based polyesters showed significant Tg variation with composition changes.
Solution Approach 2:
The patent creates a composite polyester system by combining FDCA-based polyester chains with cyclohexanedimethanol units. This composite structure, where FDCA provides thermal stability and CHDM contributes to polymer chain flexibility and intermolecular interactions, results in a material that maintains stable glass transition temperature while allowing compositional variation for different application requirements.
2Adaptability or versatility
If the composition of polyester is varied to achieve different properties, then the properties can be tailored, but the glass transition temperature becomes unstable
Solution Approach 1:
The patent changes the fundamental chemical parameter from terephthalic acid to 2,5-furandicarboxylic acid, which creates a polyester system where the glass transition temperature is insensitive to compositional variations. This allows the patent to achieve both compositional flexibility (1-99 mole% cyclohexanedimethanol) and thermal stability simultaneously, resolving the contradiction between adaptability and stability.
3Stability of the object's composition
If 2,5-furandicarboxylic acid is used instead of terephthalic acid, then the glass transition temperature remains stable, but the manufacturing process may require optimization
Solution Approach 1:
The patent uses dimethyl 2,5-furandicarboxylate (DMFDCA) as an intermediary ester form of FDCA. This intermediary allows for easier handling and more controlled polymerization reactions compared to using the free acid form. The ester can be more readily purified and provides better control over the polymerization process, facilitating manufacturing while maintaining the stable glass transition temperature characteristic of FDCA-based polyesters.
Data Source
Figure 1
AI summary
Described are polyesters comprising (a) a dicarboxylic acid component comprising 2,5-furandicarboxylic acid residues; optionally, aromatic dicarboxylic acid residues and/or modifying aliphatic dicarboxylic acid residues and 1,4-cyclohexanedimethanol residues. The polyesters may be manufactured into articles such as fibers, films, bottles, coatings, or sheets.