Synthesis, characterization, and application of bio-based polyurethane foams from isosorbide-derived diols and renewable polyols for sustainable thermal insulation

Project Abstract

Synthesis, characterization, and application of bio-based polyurethane foams from isosorbide-derived diols and renewable polyols for sustainable thermal insulation demonstrates a sustainable alternative to conventional petrochemical foams by integrating bio-based diols derived from isosorbide with renewable polyols to produce flexible and rigid polyurethane foams. The study develops a comprehensive synthesis strategy that leverages transesterification and polyaddition reactions to achieve high crosslink density while maintaining processability for scalable manufacturing. Key objectives include optimizing the isosorbide-derived diol content, selecting compatible renewable polyols (such as sucrose polyesters and bio-based polyether polyols), and employing catalysts and blowing agents that minimize environmental impact without compromising foam morphology, mechanical strength, or thermal insulation performance. A full characterization suite is employed, including FTIR and NMR to confirm chemical structures and urethane linkage formation, DSC and DMTA to assess thermal transitions and mechanical behavior across service temperatures, TGA for thermal stability, and SEM to analyze foam cell morphology. Mechanical properties, including compressive strength, modulus, and creep resistance, are evaluated in relation to density and crosslinking degree, while thermal insulation performance is quantified through apparent thermal conductivity (k-value) under standard and humidity-controlled conditions. The research investigates long-term aging behavior, including UV stability, hydrolytic resistance, and oxidative stability, to project service life in building envelope applications. An environmental life cycle assessment (LCA) compares the bio-based foam formulation with conventional fossil-based polyurethane foams, focusing on cradle-to-gate impacts, energy consumption, greenhouse gas emissions, and end-of-life scenarios such as recyclability and potential for chemical recycling. The study also examines the influence of blowing agents on global warming potential and ozone depletion, and explores the feasibility of incorporating bio-based fillers (e.g., lignocellulosic fibers) to enhance mechanical properties while maintaining low thermal conductivity. Results indicate that increasing the isosorbide-derived diol fraction improves glass transition temperature and dimensional stability, reduces flammability indicators, and maintains acceptable compressive properties at reduced density. The optimized formulation achieves k-values competitive with conventional rigid foams while delivering a significant reduction in embodied energy and fossil resource depletion. The work further demonstrates scalable synthesis routes compatible with existing polyurethane equipment, along with processing guidelines to minimize phase separation and achieve uniform cell structure. Overall, the research provides a viable pathway toward sustainable thermal insulation materials with reduced environmental footprint, high-performance thermal resistance, and compatibility with green construction practices, contributing to policy-aligned advancements in bio-based polymer foams for building applications.

Project Overview

What This Project Is About

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This project looks at making and testing bio-based foams called polyurethane foams. The goal is to use natural, renewable materials (is_isosorbide-derived diols and renewable polyols) instead of traditional, petroleum-based components to create foams that insulate well and are friendlier to the environment. We will study how these materials react to form foam, how strong and warm they are, and how they behave in real-world insulation applications.

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The Problem It Addresses

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Many insulation foams rely on non-renewable chemicals and can have environmental drawbacks. This project aims to reduce dependence on fossil resources by using isosorbide-derived diols and other renewable polyols. It also seeks to understand how bio-based foams compare to conventional ones in terms of performance and safety, addressing both sustainability and practical use in buildings or equipment.

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Objectives of the Project

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1. Identify suitable bio-based raw materials and prepare polyurethane foams from them.
2. Characterize the chemical structure and properties of the foams (e.g., density, strength, thermal conductivity).
3. Assess thermal insulation performance and fire-related safety features.
4. Evaluate processing methods to optimize foam quality and consistency.
5. Compare performance with traditional foams to highlight advantages and limits.

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What You Will Do Step by Step

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1) Literature review on bio-based polyurethanes and isosorbide-derived diols. 2) Sourcing materials and preparing polyurethane foams. 3) Conducting chemical and physical tests on the foams. 4) Measuring insulation performance and stability under heat. 5) Analyzing data to identify correlations between composition and properties. 6) Comparing results with conventional foams. 7) Writing a concise report summarizing findings and implications.

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Expected Outcome

We expect to produce a set of bio-based polyurethane foams with competitive insulation performance and clearer environmental benefits. The project should show how renewable components affect strength, durability, and safety, providing a basis for further optimization and potential real-world use.