Related Experiment Video
Updated: Sep 21, 2025
10:22
Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
Published on: November 30, 2020
3.6K
Unique Base-Initiated Depolymerization of Limonene-Derived Polycarbonates
Chunliang Li1,2, Rafaël J Sablong1,3, Rolf A T M van Benthem1,4
1Laboratory of Physical Chemistry, Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
ACS Macro Letters
|June 2, 2022
Summary
Poly(limonene carbonate) (PLC) undergoes rapid depolymerization using 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) base. This process enables complete recycling of PLC into its original monomer, highlighting its potential as a sustainable material.
Area of Science:
- Polymer Chemistry
- Sustainable Materials Science
- Organic Synthesis
Background:
- Poly(limonene carbonate) (PLC) is a biobased polymer with potential applications in sustainable materials.
- Efficient depolymerization and recycling methods are crucial for realizing the full potential of biobased polymers.
- Understanding degradation pathways is key to controlling polymer stability and recyclability.
Purpose of the Study:
- To investigate the depolymerization of poly(limonene carbonate) (PLC) initiated by the organic base 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD).
- To explore the recyclability of PLC into its constituent monomer.
- To assess the impact of end-capping on PLC stability during degradation.
Main Methods:
- Depolymerization experiments using TBD as a catalyst at elevated temperatures.
- Analysis of degradation products to confirm monomer recovery.
- End-capping reactions to modify PLC chain ends and evaluate stability.
Main Results:
- TBD effectively deprotonates OH-terminated PLC, initiating rapid degradation via backbiting reactions.
- Quantitative depolymerization of PLC into limonene oxide monomer was achieved.
- End-capping of PLC enhanced its stability against TBD-initiated degradation, supporting the proposed mechanism.
Conclusions:
- The base-initiated depolymerization of PLC by TBD offers a pathway for complete back-to-monomer recyclability.
- PLC can be considered a highly sustainable material due to its efficient recyclability.
- End-capping strategies can be employed to control PLC stability and degradation pathways.
Related Concept Videos
00:57Cationic Chain-Growth Polymerization: Mechanism
2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
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
01:20Anionic Chain-Growth Polymerization: Overview
2.2K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.2K
01:04Anionic Chain-Growth Polymerization: Mechanism
2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
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
01:13Olefin Metathesis Polymerization: Overview
2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.3K