Research on the Mechanical Properties of Elliptical Negative Poisson’s Ratio Structures DOI Creative Commons
Ming Xie, Xiangdong Wu,

Fangbo Xu

et al.

Buildings, Journal Year: 2024, Volume and Issue: 14(12), P. 3965 - 3965

Published: Dec. 13, 2024

A negative Poisson’s ratio structure has special deformation behavior and energy absorption characteristics, is a new with broad application prospects. However, most of the current research still at micro theoretical level, there less on macro mechanical properties. Therefore, this paper proposes polyurethane elliptical (PES), uses methods experimental simulation numerical to carry out comparison concave (PCS) analyze influence length–width structure, highlighting advantages PES in absorption, using parameter analysis study structural form material properties elastic modulus PES, so as provide scientific basis technical support for high-end equipment manufacturing, seismic isolation other fields.

Language: Английский

Cardanol Modified Alkyd Resin: Novel Route to Prepare Mos2 Based Polyurethane Nanocomposite Coatings DOI

Vikas J. Patil,

Kiran S. Patil, Swapnil L. Sonawane

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

1
Unveiling the Potential of Plant-Derived Diarylheptanoids and Their Derivatives in Bio-Based Polyurethane Compositions DOI Creative Commons
Matīss Pāls, Jevgenija Ponomarenko, Māris Lauberts

et al.

Plants, Journal Year: 2025, Volume and Issue: 14(5), P. 775 - 775

Published: March 3, 2025

The key challenge in polymer science is developing sustainable synthesis methods using renewable feedstocks. This study explores plant-derived diarylheptanoids with various structures as the building blocks for polyurethane (PU) materials. Diarylheptanoid glucosides isolated from black alder (Alnus glutinosa) bark were hydrolyzed and fractionated to remove sugar moieties. resulting diarylheptanoids, along unhydrolyzed analogues curcumin, used biomass-based polyols synthesize model PU films. Incorporating enhanced mechanical strength reduced flexibility of due increased crosslinking, effects proportional OH functionality polyols. Weight loss, FTIR, Py-GC-MS/FID analyses revealed that catechol moieties glucosidic bonds are biodegradable structural subunits incorporated into Rigid foams (PURs) incorporating high-OH-functionality diarylheptanoid such oregonin demonstrated significantly higher compression less weight loss during non-isothermal thermal analysis air compared those commercial polyol-based foams. A cone calorimeter test showed PUR foam derivatives had a lower degradation rate, longer flame-burning time, 30% heat emission, 25% smoke, indicating improved flame retardancy. Adding 1–2% oregonin-enriched extracts Elastopir 1132/509/0 its resistance oxidative aging, outperforming antioxidant Irganox.

Language: Английский

Citations

0
Unlocking the Potential of Lignin-based Polyhydroxyurethanes: Insights into Kinetics, Physical Behavior, and Recyclability DOI Creative Commons

Nathan Wybo,

Antoine Duval, Luc Avérous

et al.

Materials Today Sustainability, Journal Year: 2025, Volume and Issue: unknown, P. 101117 - 101117

Published: April 1, 2025

Language: Английский

Citations

0
Study on Mechanical Properties of Elliptical Negative Poisson’s Ratio Rubber Material DOI

湘栋 武

Hans Journal of Civil Engineering, Journal Year: 2025, Volume and Issue: 14(04), P. 893 - 905

Published: Jan. 1, 2025

Language: Английский

Citations

0
Environmental benefits of valorising food waste into bio-based polyols for the production of polyurethane rigid foams DOI
Zi‐Hao Qin, Anda Fridrihsone, Dong Liang

et al.

Sustainable Production and Consumption, Journal Year: 2024, Volume and Issue: 51, P. 572 - 583

Published: Oct. 9, 2024

Language: Английский

Citations

2
Waste-Cooking-Oil-Derived Polyols to Produce New Sustainable Rigid Polyurethane Foams DOI Open Access
Miriam Cappello, Sara Filippi, Damiano Rossi

et al.

Sustainability, Journal Year: 2024, Volume and Issue: 16(21), P. 9456 - 9456

Published: Oct. 31, 2024

Polyurethanes (PUs) are one of the most versatile polymeric materials, making them suitable for a wide range applications. Currently, petroleum is still main source polyols and isocyanates, two primary feedstocks used in PU industry. However, due to future price uncertainties need eco-friendly alternatives, recent efforts have focused on replacing petrol-based isocyanates with counterparts derived from renewable resources. In this study, waste cooking oil was as feedstock obtain (POs) new sustainable polyurethane foams (PUFs). POs various hydroxyl numbers were synthesized through epoxidation followed by oxirane ring opening diethylene glycol. By adjusting reagent amounts (acetic acid H2O2), epoxidized oils (EOs) different degrees (50–90%) and, consequently, OH (200–300 mg KOH/g) obtained. Sustainable PUFs high bio-based content produced mixing commercial partially aliphatic isocyanate using water blowing agent presence gelling catalyst additives. Various (4, 8, 15 php) (0, 1, 2 tested assess their effect foam properties. also prepared EOs instead investigate potential use directly PUF production. Characterization included morphological, chemical, physical, thermal, mechanical analyses. The rigid exhibited density (150–300 kg/m³) stability up 200 °C. combined enabled 77 wt.%. demonstrated production bypassing second synthesis step, enhancing sustainability, significantly reducing energy costs; however, formulations require optimization lower epoxy reactivity.

Language: Английский

Citations

1
Research on the Mechanical Properties of Elliptical Negative Poisson’s Ratio Structures DOI Creative Commons
Ming Xie, Xiangdong Wu,

Fangbo Xu

et al.

Buildings, Journal Year: 2024, Volume and Issue: 14(12), P. 3965 - 3965

Published: Dec. 13, 2024

A negative Poisson’s ratio structure has special deformation behavior and energy absorption characteristics, is a new with broad application prospects. However, most of the current research still at micro theoretical level, there less on macro mechanical properties. Therefore, this paper proposes polyurethane elliptical (PES), uses methods experimental simulation numerical to carry out comparison concave (PCS) analyze influence length–width structure, highlighting advantages PES in absorption, using parameter analysis study structural form material properties elastic modulus PES, so as provide scientific basis technical support for high-end equipment manufacturing, seismic isolation other fields.

Language: Английский

Citations

0