Synthesis and characterization of bio-based cyclic carbonate monomers for sustainable polymer networks via ring-opening polymerization and their application in CO2 capture and catalysis.

Project Abstract

Sustainable polymer networks demand renewable monomers with tunable properties and enhanced environmental compatibility, and this study presents a comprehensive exploration of bio-based cyclic carbonate monomers synthesized from renewable feedstocks such as oleochemicals and lignocellulosic derivatives through efficient ring-opening polymerization (ROP) strategies. The synthesis workflow integrates exo- and endo-selective cyclization, solvent- and catalyst-optimized conditions, and chemoselective functionalization to yield a library of cyclic carbonates with varied ring sizes, substituents, and pendant functionalities tailored for 3D network formation and processability. Detailed structural characterization using NMR (1H, 13C, and HSQC), FTIR, GC-MS, and X-ray diffraction confirms the integrity of cyclic carbonate rings, while GPC analyses reveal controllable molecular weights, narrow dispersities, and successful end-group fidelity essential for precise network architecture. Thermal and mechanical profiling via DSC, TGA, DMA, and dynamic rheology demonstrates that polymer networks derived from these bio-based monomers exhibit high glass-transition temperatures, elevated storage moduli, and robust thermal stability, attributable to rigid carbonate backbones and strategic covalent crosslinking densities. The research investigates the impact of substituent electronics and sterics on polymerization kinetics and network topology, establishing correlations between monomer structure, polymerization rate, and final mechanical performance. A significant focus is placed on sustainability metrics, including life-cycle assessment (LCA), cradle-to-gate energy consumption, and the carbon footprint reduction relative to conventional fossil-based monomers, alongside an evaluation of biodegradability and end-of-life options under composting and specific enzymatic conditions. The study extends to functional assessments of CO2 capture and catalysis, where the cyclic carbonate networks are post-functionalized with amine and metal-chelating groups to create heterogeneous sorbents and catalytic supports. CO2 absorption-desorption cycles quantify uptake capacity, selectivity in mixed-gas streams, and recyclability over multiple cycles, while catalytic tests probe activity and stability in representative transformations such as transesterification, cycloaddition, and oxidation-reduction reactions under mild conditions, using immobilized metal complexes and organocatalysts tethered to the network matrix. Mechanistic insights are gained through operando spectroscopic techniques and kinetic modeling, delineating pathways for CO2 activation, carbonate exchange, and network remodeling under process temperatures. The research also addresses process scale-up considerations, solvent recovery strategies, and solubility challenges, proposing a scalable synthetic route and modular network fabrication platform that can accommodate diversified monomer designs. Overall, the work delivers a holistic framework linking bio-based cyclic carbonate monomer chemistry to the performance of sustainable polymer networks and their dual role in CO2 capture and catalysis, demonstrating that renewable feedstocks can meet stringent material property targets while enabling circular material lifecycles and contributing to climate-positive technological solutions.

Project Overview

What This Project Is About

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A straightforward look at creating and studying bio-based cyclic carbonate molecules and using them to build durable, recyclable polymer networks. The project also explores how these networks can capture carbon dioxide (CO2) and help drive chemical reactions in useful ways.

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The Problem It Addresses

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Many plastics are hard to recycle and rely on fossil-based materials. This project aims to use renewable, bio-based building blocks to make polymers that can be opened and re-closed (reversible chemistry), reducing waste. It also investigates efficient CO2 capture and catalytic uses, which could lower greenhouse gas emissions and support greener chemical processes.

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Objectives of the Project

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1. Learn how to synthesize bio-based cyclic carbonate monomers.
2. Characterize the chemical structure and properties of these monomers.
3. Study ring-opening polymerization to form sustainable polymer networks.
4. Evaluate the materials’ ability to absorb CO2.
5. Test catalytic activity for representative chemical reactions.
6. Assess recyclability and reprocessability of the networks.
7. Compare performance with conventional fossil-based polymers.
8. Document practical guidelines for future work and safety.

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What You Will Do Step by Step

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Step 1: Review literature on bio-based monomers and cyclic carbonates.

Step 2: Synthesize selected bio-based cyclic carbonate monomers.

Step 3: Use ring-opening polymerization to form networks and test basic properties.

Step 4: Measure CO2 absorption capacity under controlled conditions.

Step 5: Conduct simple catalytic tests to assess reaction efficiency.

Step 6: Analyze materials with basic tools (e.g., spectroscopy, thermal analysis).

Step 7: Compare results to conventional polymers and discuss advantages/limits.

Step 8: Compile results, draw conclusions, and suggest improvements.

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Expected Outcome

Anticipated results include a set of bio-based monomers, polymer networks with good recyclability, measurable CO2 capture capability, and initial evidence of useful catalytic activity. The project should provide a clear path for optimizing sustainability and reducing reliance on fossil-based materials.