Results 81 to 90 of about 3,694 (226)

Experimental and numerical analysis of polyurethane spraying materials as a compressible layer in deep soft rock tunnels

Journal of Rock Mechanics and Geotechnical Engineering
Polyurethane foam, when used as a compressible layer in deep soft rock tunnels, offers a feasible solution to reduce the support pressure on the secondary lining.
Haibo Wang, Fuming Wang, Tongming Qu, Jun Liu, Lei Qin, Chengchao Guo   +5 more
doaj   +1 more source

Thermal Management and Mechanical Properties of Epoxy‐Sandwich Composites Containing Microencapsulated Phase Change Material

Polymer Composites, EarlyView.
Schematic representation of a multifunctional sandwich composite consisting of face sheets and a PCM‐filled epoxy foam core, combining structural performance with thermal energy storage capability. ABSTRACT In this work, epoxy (EP) foams containing 10, 20, and 30 wt% of microencapsulated phase change materials (PCMs) were developed as potential cores ...
Laura Simonini, Silvia Santagiuliana, Alessandro Tomasini, Giulia Fredi, Alessandro Pegoretti   +4 more
wiley   +1 more source

Dynamic Characterization of Frequency Response of Shock Mitigation of a Polymethylene Diisocyanate (PMDI) Based Rigid Polyurethane Foam

Latin American Journal of Solids and Structures
Kolsky compression bar experiments were conducted to characterize the shock mitigation response of a polymethylene diisocyanate (PMDI) based rigid polyurethane foam, abbreviated as PMDI foam in this study. The Kolsky bar experimental data was analyzed in
Bo Song, Kevin Nelson
doaj   +1 more source

Molecular Weight–Dependent Reinforcement of Biobased Aromatic Thermoplastic Polyurethanes Using Vegetable Oil Crosslinkers

Polymer Engineering &Science, EarlyView.
Strategy for biobased aromatic thermoplastic polyurethanes. ABSTRACT The transition toward sustainable thermoplastic polyurethanes (TPUs) is a key challenge for reducing the carbon footprint for a wide range of applications, from industrial to transportation, including advanced applications such as 3D‐printed sensors and soft actuators.
Héloïse Sauquet, Leonel Matias Chiacchiarelli, Edu Ruiz   +2 more
wiley   +1 more source

Bio‐Based Polyurethanes: Mechanical Performance, Structure–Property Relationships, and Future Directions

Journal of Polymer Science, EarlyView.
This review examines bio‐based polyurethanes from renewable feedstocks, focusing on structure‐property relationships governing mechanical performance. It analyzes reinforcement strategies, benchmarks against petrochemical counterparts, and explores future directions, including non‐isocyanate routes and circular economy integration for sustainable high ...
Khaled Chawraba, Hussein Medlej, Mohamad Sakr, Akram Hijazi, Abrar Hussain   +4 more
wiley   +1 more source

Enhanced thermal stability, flame retardancy, and mechanical properties of casein-modified rigid polyurethane foams

Case Studies in Thermal Engineering
Rigid polyurethane foam (RPUF) is now widely used in various industries, and there is an increasing interest in preparing green RPUF with high flame retardancy and mechanical properties.
Xu Zhang, Qihong Guan, Shuai Ding, Zhi Wang, Hua Xie   +4 more
doaj   +1 more source

Relation of Bulk‐to‐Shear Loss Factors in Viscoelastic Auxetic Metamaterials

physica status solidi (b), EarlyView.
This article examines the dynamic behavior of isotropic auxetic viscoelastic materials, highlighting how negative Poisson's ratios affect energy dissipation, damping, and the interplay between bulk and shear moduli. By extending established viscoelastic theories to the auxetic range, it defines bound limits and underscores how dynamic Poisson's ratio ...
Simon Preston, Julián Londoño‐Monsalve, Ken E. Evans   +2 more
wiley   +1 more source

Polyamide Acid–Based Surface Modification of Poly(p‐Phenylene Benzobisoxazole) Fibres Reinforcing Syntactic Foam for Using Them as High‐Performance Insulating Core Material

High Voltage, EarlyView.
ABSTRACT The insulating core is an important part of pillar composite insulators used in power transmission systems. Traditional insulating core materials suffer from various problems that can threaten the reliability of insulated equipment. Syntactic foam (SF) exhibits excellent properties, such as a low density, water penetration resistance and high ...
Le Li, Xingdou Li, Zhuangzhuang Li, Chi Wang, Yang Wang, Wenhua Wu, Lei Yang, Jinxiang Liang, Yunpeng Liu   +8 more
wiley   +1 more source

Hydraulic In Vitro Characterization of MR‐Conditional Blood Pumps

Artificial Organs, EarlyView.
Cardiac surgery in neonates requires close placement of cardiopulmonary bypass machines due to limited blood volume, complicating MR compatibility. This study introduces three MR‐conditional blood pump prototypes. None interfered with MRI imaging, though RF‐related sensor effects remain untested.
Dominik T. Schulte, Marcel Renggli, Henning Richter, Francesca Del Chicca, Michael Hofmann, Martin O. Schmiady, Marianne Schmid Daners   +6 more
wiley   +1 more source

Optimized sound absorption of a rigid polyurethane foam

Archives of Acoustics, 2003
In this study, cast panel received as sound insulator was implemented as sound absorber. The panel is composed of prepainted metal skins with a rigid self extinguishing polyurethane foam.
M. A. Ibrahim, R. W. Melik
doaj