Emerging Trends in Nonisocyanate Polyurethane Foams: A Review DOI Creative Commons

Chen Chuan Lim,

Michelle Jui Hsien Ong,

Mingyue Wu

et al.

ACS Engineering Au, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 31, 2024

Polyurethane foams (PUF) are essential materials known for their exceptional chemical and mechanical properties, making them ubiquitous in a wide range of applications. Conventionally, PUF produced through polyaddition reactions between polyols polyisocyanates at room temperature, where water plays critical role this process by hydrolyzing the isocyanates, leading to release carbon dioxide (CO2) as blowing agent. In recent years, isocyanates have raised significant concerns industries consumers due high toxicity. Therefore, driving need explore alternative synthesis routes that do not involve use isocyanates. Nonisocyanate polyurethane (NIPUF) derived from aminolysis cyclic carbonates emerged most promising solution replace conventional method producing PUF. Despite this, challenging aspect lies identifying suitable foaming strategy NIPUF can satisfy both sustainability performance requirements. view first part review focuses on background, chemistry, challenges second part, chemistry various strategies used prepare discussed analyzed. Finally, outlook future research focus areas outlined.

Language: Английский

Increasing the cross-link density in a dual dissociative and associative polythiourethane covalent adaptable network improves both creep resistance and extrudability DOI
Sergio Serna, Nathan S. Purwanto, Logan M. Fenimore

et al.

Polymer, Journal Year: 2024, Volume and Issue: 306, P. 127232 - 127232

Published: June 1, 2024

Language: Английский

Citations

5
Nonisocyanate Polyurethanes Originated from Biobased Isosorbide with Good Combined Properties DOI

Danqing Song,

Jin He,

Qiqi Xie

et al.

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(14), P. 8133 - 8141

Published: July 17, 2024

Polyurethane (PU) is conventionally synthesized via the isocyanate route, which has been widely reported to be hazardous environment and humans. Consequently, there an urgent need develop environmentally friendly method for preparation of nonisocyanate polyurethanes (NIPUs). Herein, a green synthetic route polyurethane, originating from dimethyl carbonate, 1,6-hexanediamine, 1,6-hexanediol, rigid biobased isosorbide introduced enhance mechanical properties heat deflection temperature NIPUs. A series polycarbonate-based (ISPCUs) were by adjusting content in hard segments. The results show that ring structure enhances thermal PU. Notably, melting point ISPCUs increased 93 119 °C, enhanced 85 °C 41 NIPUs without isosorbide. improved substantially, especially tensile strength, evidently 18 MPa PU 65 ISPCUs. This work provides synthesize with exceptional resistance properties.

Language: Английский

Citations

5
Biobased, catalyst-free non-isocyanate polythiourethane foams: Highly dynamic nature affords fast reprocessability, extrudability and refoamability DOI
Yixuan Chen, Nathan S. Purwanto, Boran Chen

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 154035 - 154035

Published: July 21, 2024

Language: Английский

Citations

4
Bio-based poly(hydroxyurethane)s of good thermal/mechanical properties upon insertion of polyamide segments DOI

Yao Qin,

Yanyan Wang,

Yuanmeng Wang

et al.

Materials Chemistry and Physics, Journal Year: 2025, Volume and Issue: unknown, P. 130522 - 130522

Published: Feb. 1, 2025

Language: Английский

Citations

0
Advancing Non-isocyanate Polyurethane Foams: exo-Vinylene Cyclic Carbonate–Amine Chemistry Enabling Room-Temperature Reactivity and Fast Self-Blowing DOI
M S Makarov,

Maxime Bourguignon,

Bruno Grignard

et al.

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Language: Английский

Citations

0
Bio-Based Polyurethane Foams: Feedstocks, Synthesis, and Applications DOI Creative Commons
Marta Santos, Marcos Mariz, Igor Tiago

et al.

Biomolecules, Journal Year: 2025, Volume and Issue: 15(5), P. 680 - 680

Published: May 7, 2025

Polyurethanes (PUs) are extremely versatile materials used across different industries. Traditionally, they synthesized by reacting polyols and isocyanates, both of which petroleum-derived reagents. In response to the demand for more eco-friendly materials, research has increasingly focused on developing new routes PU synthesis using renewable feedstocks. While substituting isocyanates remains a greater challenge, replacing fossil-based with bio-based alternatives is now promising strategy. This review explores main natural sources their transformations into bio-polyols, incorporation bio-fillers formulations, production non-isocyanate polyurethanes (NIPUs). Additionally, study summarizes growing body that reported successful outcomes bio-polyols in foams distinct applications.

Language: Английский

Citations

0
Covalent Adaptable Networks with Associative Siloxane Exchange Enabled by Amide‐Based Internal Catalysis: Designing for Reprocessability and Extrudability by Increasing the Cross‐Link Density DOI Creative Commons
Nathan S. Purwanto, Tong Wang, Xiaoyang Liu

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 9, 2025

Abstract Replacing non‐recyclable thermosets with covalent adaptable networks (CANs) that recover cross‐link density after reprocessing will reduce waste and contribute to a circular polymer economy. Many CANs undergoing associative dynamic exchange require catalysis. External catalysis often leads harmful effects, e.g., increased creep, accelerated material aging, catalyst leaching. Herein, internally catalyzed siloxane chemistry is demonstrated resulting from amides covalently linked through alkyl chains siloxanes. Small‐molecule studies show the formation of products reaction two amide‐containing molecules. From rubbery plateau modulus, each siloxane‐exchange‐based CAN exhibits temperature‐invariant, or nearly so, characteristic CANs. The length in siloxane‐containing monomer tunes network density. Cross‐link recovery achieved, required time temperature decreasing increasing Stress relaxation also faster dynamics reprocessability arise because second order (i.e., cross‐linker) concentration. Capitalizing on this, melt extrusion highest demonstrated, achieving same extruded compression‐molded Using identical conditions, next‐highest not extrudable.

Language: Английский

Citations

0
Catalyst-Free Polyhydroxyurethane Covalent Adaptable Networks Exhibiting Full Cross-Link Density Recovery after Reprocessing: Facilitation by Synthesis with Well-Designed Secondary Amines DOI
Yen-Wen Huang, John M. Torkelson

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Language: Английский

Citations

0
The Multifaceted Role of Water as an Accelerator for the Preparation of Isocyanate-Free Polyurethane Thermosets DOI
Florent Monie, Thomas Vidil, Étienne Grau

et al.

Macromolecules, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 12, 2024

Language: Английский

Citations

3
The multifaceted role of water as an accelerator of the crosslinking reaction of isocyanate-free polyurethane networks DOI Creative Commons
Florent Monie, Thomas Vidil, Étienne Grau

et al.

Published: June 21, 2024

Polyhydroxyurethane (PHU) thermosets are the most promising isocyanate-free substitutes to polyurethane ones when targeting main applications of PU business (coatings, adhesives, foams). However, curing their solvent-free formulations at near room temperatures is often very slow and requires utilization organocatalysts, limiting large-scale deployment technology. Herein, we study impact water, introduced as an additive (2 10 wt.%), on crosslinking rate common thermosetting PHU composed a polycyclic carbonate diamine. Rheology measurements, using multi-frequency approach, indicate that even small amounts water (< 5 wt.%) impressively shorten gel times, by up folds 40 °C. The methodology highlights for first time strong interactions with growing network during reaction. It suggests breaks down multiple intra-/inter-molecular H-bond within clusters, consequently enhancing molecular mobility delaying vitrification (hydroplasticization), both phenomena contributing accelerate rate. On top that, through combination model reactions computational calculations, demonstrate actual catalyst cyclic aminolysis. Eventually, thanks its multifaceted role, can efficiently substitute organocatalysts (e.g. TBD, DBU) usually required cure ambient temperature. This work demonstrates use in cost-effective, non-toxic, robust solution production materials, free any organocatalyst. offers prospects PHU-based materials requiring mild processing conditions.

Language: Английский

Citations

1