Biodegradable Polyester Composition for Thermal Stability
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Solution Overview
Problem
Current biodegradable aliphatic-aromatic polyesters face challenges in maintaining high thermal and mechanical properties while reducing environmental impact, as high terephthalic acid content decreases biodegradation percentages and relies on non-renewable synthetic sources.
Innovation Solution
Development of biodegradable aliphatic-aromatic polyesters incorporating 1-99% phthalic aromatic diacid and 99-1% heterocyclic aromatic diacid of renewable origin, with a focus on using diacids and diols from renewable sources, allowing for a high percentage of renewable carbon content and improved biodegradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If terephthalic acid content is increased to improve thermal and mechanical properties, then melting temperature and crystallization rate improve, but biodegradation percentage decreases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing terephthalic acid with phthalic acid and heterocyclic aromatic diacids in specific ratios (1-99% phthalic, 99-1% heterocyclic). This parameter modification maintains the aromatic content needed for high melting temperature while introducing biodegradable structures through the heterocyclic components, thus resolving the contradiction between thermal stability and biodegradability
Solution Approach 2:
The patent creates a composite polyester structure combining phthalic acid units, heterocyclic aromatic diacid units, and aliphatic dicarboxylic acid units. This composite approach allows the material to exhibit both the high melting temperature characteristics from the aromatic phthalic components and the biodegradation capability from the heterocyclic and aliphatic components, simultaneously satisfying both requirements
2Strength
If terephthalic acid content is increased to improve thermal and mechanical properties, then polymer performance improves, but environmental impact worsens due to non-renewable synthetic sources
Solution Approach 1:
The patent modifies the feedstock source parameter by replacing synthetic terephthalic acid with heterocyclic aromatic diacids derived from renewable resources (such as furandicarboxylic acid from biomass). This parameter change maintains the mechanical properties through adequate aromatic content while eliminating the environmental harm associated with petroleum-based synthetic feedstocks
Solution Approach 2:
The patent adopts a bio-based, renewable feedstock approach that is sustainable and environmentally friendly, replacing the persistent synthetic petroleum-based terephthalic acid with biodegradable heterocyclic diacids from renewable sources, thus reducing long-term environmental impact while maintaining performance
3Object-affected harmful factors
If heterocyclic aromatic diacid of renewable origin is used to reduce environmental impact, then renewable carbon content increases, but thermal and mechanical properties may decrease
Solution Approach 1:
The patent optimizes the compositional parameters by maintaining a minimum of 1% heterocyclic aromatic diacid for biodegradability and renewable content while compensating for thermal properties through adequate phthalic acid content (1-99%) and appropriate selection of aliphatic dicarboxylic acids and diols. This parameter balancing ensures both environmental sustainability and sufficient thermal performance
Solution Approach 2:
The patent creates a composite structure where heterocyclic aromatic diacid units provide biodegradability and renewable content, phthalic acid units contribute to high melting temperature and mechanical strength, and aliphatic dicarboxylic acid units enhance flexibility and biodegradation. The synergistic combination of these different units in the copolyester chain allows simultaneous achievement of environmental sustainability and thermal-mechanical performance
Data Source
AI summary
Disclosed are biodegradable aliphatic-aromatic polyesters obtained from aliphatic dicarboxylic acids, polyfunctional aromatic acids and diols, wherein the polyfunctional aromatic acids are constituted by mixtures of acids of renewable and synthetic origin its esters. In particular, the polyfunctional aromatic acids comprise at least one phthatic diacid and at least one heterocyclic aromatic diacid of renewable origin, which can be 2,5-furandicarboxylic acid and its esters. Also, provided are mixtures of the polyesters with other biodegradable polymers both of natural and synthetic origin.