Polyester Tensile Strength via Sulfonate Group Control
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Solution Overview
Problem
Water-soluble polymers based on 2,5-furandicarboxylic acid lack sufficient mechanical strength for many applications, despite being biodegradable and renewable.
Innovation Solution
Development of polyesters comprising 2,5-furandicarboxylic acid, aliphatic C4-C36 dicarboxylic acids, and sulfonate group-containing dicarboxylic acids, with specific diol and branching components, which enhance mechanical properties and biodegradability, allowing for higher tensile strength and improved processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water-soluble polymers based on 2,5-furandicarboxylic acid are produced with high sulfonate group content (>12 mol %) to achieve water solubility, then water solubility is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the sulfonate group content within 3-12 mol % (optimizing the previously problematic high concentration), adjusting the molar ratios of diacids and diols, and controlling polymerization parameters to achieve both water solubility and improved mechanical properties
Solution Approach 2:
The patent creates a composite polyester system combining 2,5-furandicarboxylic acid units with sulfonate group-containing units in specific proportions, integrating renewable aromatic content with water-solubility-providing sulfonate groups to achieve a balance between mechanical strength and solubility
2Reliability
If polyesters are made from renewable raw materials like 2,5-furandicarboxylic acid to improve biodegradability, then biodegradability is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent creates a composite polyester structure integrating renewable 2,5-furandicarboxylic acid units (providing biodegradability) with aliphatic dicarboxylic acid units and sulfonate group-containing units (providing mechanical strength and water solubility), achieving a balance between biodegradability and mechanical performance
Solution Approach 2:
The patent applies local quality by distributing different functional units throughout the polymer chain: 2,5-FDCA units for biodegradability, aliphatic dicarboxylic acid units for flexibility and processability, and sulfonate units for water solubility, with each component contributing locally to the overall performance
3Adaptability or versatility
If aliphatic-aromatic polyesters contain 25-99 mol % 2,5-furandicarboxylic acid to maximize renewable content, then renewable sourcing is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent optimizes the renewable content parameter by setting 2,5-FDCA at 25-99 mol % (with preferred ranges of 40-80 mol %) rather than using pure 2,5-FDCA, balancing renewable content with mechanical performance through controlled composition
Solution Approach 2:
The patent develops a composite polyester system where renewable 2,5-FDCA units are combined with aliphatic dicarboxylic acid units and sulfonate-containing units, creating a multi-component renewable polyester that achieves both high renewable content and acceptable mechanical properties
Data Source
AI summary
The present invention relates to a polyester consisting of (A) repeat units derived from an acid component, which consists of (a1) 2,5-furandicarboxylic acid, (a2) an aliphatic C4-C36 dicarboxylic acid or a mixture of a plurality of aliphatic C4-C36 dicarboxylic acids, and (a3) a sulfonate group-containing dicarboxylic acid, and of (B) repeat units derived from a di-ol/amine component, and optionally of further repeat units (C) and/or branching components (E), and of (D) repeat units derived from at least one di- or oligofunctional compound selected from the group consisting of a di- or oligoisocyanate and a di- or oligoisocyanurate. In addition, the present invention relates to the production of these polyesters and their use.