Poly(ethylene-2,5-furandicarboxylate) Synthesis Without Purification
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Solution Overview
Problem
Current methods for producing polymers with 2,5-furandicarboxylate moieties result in colored impurities, making it difficult to achieve high molecular weight polymers without purification steps, which limits their commercialization and application in bottles, films, and fibers.
Innovation Solution
A three-step process involving transesterification of dimethyl-2,5-furandicarboxylate with diols, followed by melt-polymerization under reduced pressure, and solid-state polymerization using specific catalysts like antimony oxide, which avoids the formation of colored by-products and achieves high molecular weight polymers without the need for purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ester interchange or direct polycondensation methods are used to produce 2,5-FDCA polyesters, then the polymer can be formed, but colored impurities are generated requiring purification steps
Solution Approach 1:
The patent applies preliminary action by using dimethyl-2,5-furandicarboxylate as a pre-prepared monomer that already has the desired molecular structure, eliminating the need for subsequent purification steps to remove colored impurities. The transesterification reaction with this specific monomer produces polymers with inherently low coloration, avoiding the need for complex purification equipment and processes.
Solution Approach 2:
The patent changes the chemical parameters by selecting specific monomers (dimethyl-2,5-furandicarboxylate combined with diols) and controlling reaction conditions (catalyst selection, temperature, pressure) to achieve high molecular weight polymers with low coloration. This parameter optimization allows direct production of purification-grade polymer without additional processing steps.
2Manufacturing precision
If purification steps are added to remove colored impurities, then polymer purity is improved, but production time and cost increase
Solution Approach 1:
The methodology performs preliminary action by selecting monomers and reaction conditions that prevent colored impurity formation from the outset. The transesterification of dimethyl-2,5-furandicarboxylate with diols under controlled conditions produces polymers with inherently low coloration, eliminating the need for time-consuming purification steps and thereby maintaining high production efficiency.
Solution Approach 2:
The patent converts the potential harm of colored impurities into a benefit by carefully selecting the monomer system and reaction parameters. The specific combination of dimethyl-2,5-furandicarboxylate and diols, along with controlled transesterification conditions, transforms what could be a problematic side reaction into a controlled process that produces low-coloration polymers directly, improving both purity and productivity.
3Strength
If high molecular weight is achieved through extended polycondensation, then mechanical properties improve, but colored by-products increase requiring purification
Solution Approach 1:
The patent optimizes reaction parameters by using specific catalyst systems and controlling temperature, pressure, and monomer ratios during transesterification. This parameter control enables the production of high molecular weight polymers with excellent mechanical properties while simultaneously minimizing colored by-product formation, achieving both high strength and high purity without compromise.
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 process produces high molecular weight poly(ethylene-2,5-furandicarboxylate) polymers with low absorbance, suitable for applications in bottles, fibers, and films, offering improved mechanical properties and barrier properties, such as enhanced oxygen and CO2 resistance.
Implementation Method 1
A three-step process involving the esterification of the 2,5-FDCA with a diol first using a tin catalyst and a titanium catalyst, and a second step involving polycondensation through an ester exchange reaction
Implementation Method 2
the polycondensation was carried out between 190 and 220 °C under 3 mm Hg pressure
Implementation Method 3
the ester interchange reaction is promoted by the presence of a catalyst such as litharge, a natural mineral form of lead(II) oxide. The polymers made, however, were brown to greyish white
Implementation Method 4
the third step, a solid state polymerization at a temperature in the range of from 140 to 180 °C
Data Source
AI summary
The invention relates to a polymer having a 2,5-furandicarboxylate moiety within the polymer backbone, and having a number average molecular weight of at least 25,000, wherein said polymer is obtainable by a process comprising a transesterification step, a polycondensation step, a drying and/or crystallizing step, and a step wherein the polymer is subjected to post condensation conditions.