Related Experiment Video
Updated: Sep 18, 2025
08:50
Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces
Published on: September 26, 2014
10.3K
One-Step Conversion of Bisphenol A Polycarbonate into Aliphatic Polycarbonate Polyols for Recyclable Polyurethane
Keita Saito1, Patrick Schara1, Fabian Eisenreich1
1Polymer Performance Materials Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, 5600 MB, The Netherlands.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 21, 2025
Summary
This study upcycles bisphenol A-polycarbonate (BPA-PC) waste into recyclable thermoplastic polyurethanes (TPUs). The novel process yields high-performance TPUs with excellent mechanical properties and recyclability, contributing to a circular plastic economy.
Area of Science:
- Polymer Science
- Materials Chemistry
- Sustainable Chemistry
Background:
- Growing plastic waste necessitates advanced recycling solutions.
- Bisphenol A-based polycarbonate (BPA-PC) is a common plastic waste stream.
- Thermoplastic polyurethanes (TPUs) offer versatile applications but face end-of-life challenges.
Purpose of the Study:
- To develop a sustainable method for converting BPA-PC waste into valuable materials.
- To synthesize aliphatic polycarbonate (APC) polyols from BPA-PC.
- To produce and characterize novel TPUs using APC polyols and assess their recyclability.
Main Methods:
- One-step conversion of BPA-PC waste into APC polyols using diols.
- Synthesis of TPUs by incorporating APC polyols as soft segments with 4,4'-methylene diphenyl diisocyanate (MDI).
- Evaluation of TPU mechanical properties, hydrolytic stability, and recyclability via organocatalytic depolymerization.
Main Results:
- Successful synthesis of APC polyols from BPA-PC waste.
- TPUs demonstrated excellent mechanical properties (tensile strength 58 MPa, elongation at break 397%) and hydrolytic stability.
- Organocatalytic depolymerization achieved simultaneous hydrolysis of urethane and carbonate bonds.
- High yields of 4,4'-methylenedianiline (MDA) (96%) and 1,4-butanediol (1,4-BD) (95%) were obtained, enabling MDI regeneration.
Conclusions:
- This research presents a viable one-step upcycling strategy for BPA-PC waste into high-performance, recyclable TPUs.
- The developed organocatalytic depolymerization offers an efficient closed-loop recycling method for TPUs.
- This approach contributes to a circular plastic economy by addressing plastic waste and end-of-life management of polyurethanes.
Related Concept Videos
01:20Types of Step-Growth Polymers: Polyesters
2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K
01:03Step-Growth Polymerization: Overview
3.6K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.6K
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
8.2K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
8.2K
01:16Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.7K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.7K
03:08Hydroboration-Oxidation of Alkenes
9.0K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
9.0K
01:57Preparation of Diols and Pinacol Rearrangement
3.5K
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
3.5K