Polyester Depolymerization Using Nucleophiles for Material Reuse
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Solution Overview
Problem
There is a need for an efficient method to recycle polymer-containing materials, particularly those based on aliphatic polyalcohols and polycarboxylic acids, to convert them into reusable high-value materials while maintaining product quality.
Innovation Solution
A depolymerization process is employed at temperatures above 80°C using a nucleophile such as water, liquid polymer, or monomers of the same polymer, to reduce the polymer's extent of polymerization by at least 0.1 to 0.8, allowing the recovery of a material suitable for new polymeric materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoset polymer materials are used at high extents of polymerisation (at least 0.7), then strength and durability are improved, but recyclability and reusability deteriorate
Solution Approach 1:
The invention changes the extent of polymerisation parameter from high (at least 0.7) to reduced (at least 0.1), transforming the polymer from a thermoset state to a recyclable state. This parameter change enables the polymer to be processed and reused while maintaining adequate strength properties.
Solution Approach 2:
The invention applies a preliminary depolymerisation action before recycling to reduce the extent of polymerisation. This preliminary treatment prepares the polymer for subsequent processing and reuse, enabling the transformation from high-strength thermoset to recyclable material.
2Ease of manufacture
If conventional recycling methods are used, then processing simplicity is maintained, but product quality and molecular weight control deteriorate
Solution Approach 1:
The invention controls the depolymerisation process by adjusting parameters such as temperature (80-200°C), time (1-24 hours), and nucleophile concentration to achieve precise control over the extent of polymerisation reduction. This enables high product quality while maintaining reasonable processing simplicity.
Solution Approach 2:
The invention employs feedback control by monitoring the extent of polymerisation during the depolymerisation process and adjusting process parameters accordingly to maintain the desired polymer characteristics and product quality.
3Quantity of substance
If depolymerisation is performed for extended periods, then molecular weight reduction is improved, but processing time and energy consumption increase
Solution Approach 1:
The invention optimizes the depolymerisation process by adjusting temperature (80-200°C), nucleophile concentration, and other parameters to achieve efficient molecular weight reduction within reasonable time frames (1-24 hours), balancing processing speed with desired molecular weight control.
Solution Approach 2:
The invention may employ periodic or staged depolymerisation processes where the reaction is conducted in controlled intervals, allowing for efficient molecular weight reduction while managing processing time and energy consumption through optimized reaction cycles.
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 effectively reduces the molecular weight of the polymer, enabling its reuse in various industrial applications while preserving product quality, and avoids the introduction of new compounds that could alter the composition.
Implementation Method 1
contacting the starting material at a temperature of at least 80° C. for at most 24 hours with a nucleophile to effect depolymerisation of the polymer
Implementation Method 2
contacting the starting material at a temperature of at least 80° C.
Data Source
AI summary
The invention pertains to a process for treating a polymer-containing material, the process including: providing a starting material including a polymer which is a polyester derived from aliphatic polyalcohol with 2-15 carbon atoms that includes at least 70 wt% of polyalcohol with at least 3 hydroxyl groups, and aliphatic polycarboxylic acid with 2-15 carbon atoms that includes at least 70 wt% of tricarboxylic acid, the polyester having an extent of polymerization of at least 0.7, and contacting the starting material at a temperature of at least 80° C. for at most 24 hours with a nucleophile to effect depolymerisation of the polymer, resulting in a polymer with an extent of polymerisation which is reduced with at least 0.1 as compared to the polymer in the starting material, and is at a value in the range of 0.1-0.8, the nucleophile comprising at least one of water, liquid polymer which is the polymerisation product of an aliphatic polyalcohol with 2-15 carbon atoms and an aliphatic polycarboxylic acid with 2-15 carbon atoms.