Biodegradable Co-polyester Resin Strength Biodegradability Trade-off
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Solution Overview
Problem
Conventional biodegradable polymers face limitations in strength and durability, making them unsuitable for applications requiring high mechanical properties, while existing high-strength plastics are non-biodegradable and contribute to environmental pollution.
Innovation Solution
A biodegradable co-polyester resin is developed using a specific composition of dicarboxylic acid, C2-5 aliphatic diol, isosorbide, and cyclic aromatic dicarboxylic acid, which balances strength and biodegradability through controlled molar ratios and synthesis conditions, including esterification and condensation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional biodegradable polymers (PBS, PLA, PBAT, PBSAT) are used, then biodegradability is maintained, but strength and durability are insufficient for high-strength applications
Solution Approach 1:
The patent creates a copolymer composite material combining four different monomers (C2-5 aliphatic diol, C2-6 aliphatic dicarboxylic acid, cyclic aromatic dicarboxylic acid, and isosorbide) in specific ratios. This composite approach allows the material to simultaneously achieve high strength through aromatic dicarboxylic acid and isosorbide components while maintaining biodegradability through aliphatic diol and dicarboxylic acid components, resolving the contradiction between strength and biodegradability
2Strength
If PBS and PLA are used, then strength is relatively high, but brittleness increases making them easily breakable
Solution Approach 1:
The patent applies local quality by assigning different functional roles to different monomer components within the copolymer. The C2-5 aliphatic diol and C2-6 aliphatic dicarboxylic acid provide flexibility and biodegradability, while the cyclic aromatic dicarboxylic acid and isosorbide provide strength. This localized functional distribution within the polymer chain allows the material to have both high strength and reduced brittleness simultaneously
3Stability of the object's composition
If PBAT and PBSAT are used, then elongation is high, but strength becomes low making them unsuitable for high-strength applications
Solution Approach 1:
The patent utilizes parameter changes by precisely controlling the molar ratios of four different monomers in the copolymer synthesis. By adjusting the proportions of flexible components (C2-5 aliphatic diol, C2-6 aliphatic dicarboxylic acid) versus rigid components (cyclic aromatic dicarboxylic acid, isosorbide), the material achieves an optimal balance between elongation and strength, enabling high-strength applications while maintaining good elongation properties
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 co-polyester resin maintains high strength and durability during use and biodegrades after disposal, addressing environmental concerns and expanding application fields beyond traditional biodegradable polymers.
Implementation Method 1
mixing C2-5 aliphatic diol, isosorbide and dicarboxylic acid to perform an esterification reaction
Implementation Method 2
adding a catalyst and a thermal stabilizer to a compound produced in the esterification reaction to perform a condensation reaction
Data Source
AI summary
The present disclosure relates to a co-polyester resin of a composition including dicarboxylic acid, wherein the composition includes C2-5 aliphatic diol and isosorbide in an amount of 70 mol to 97.5 mol and 2.5 mol to 30 mol, respectively, based on 100 mol of the dicarboxylic acid, and the dicarboxylic acid includes C2-6 aliphatic dicarboxylic acid and cyclic aromatic dicarboxylic acid.