Zhipeng Ran^*, Peishuang Xiao, Shuen Liang, Keping Chen, Xiuli Zhao^*

Journal of Polymer Materials, Vol.43, No.1, 2026, DOI:10.32604/jpm.2026.074431 - 03 April 2026

Abstract This study presents the development of high-performance, solvent-free polyurethane-urea (PU) elastomeric coatings engineered for rapid curing and precise sprayability. Utilizing polyoxytetramethylene glycol (PTMG) as the primary polyol and a static-mixing spraying technique, the formulations were systematically optimized. It was found that a soft-segment content of 64% yields optimal mechanical properties, achieving a remarkable tensile strength exceeding 30 MPa. Crucially, the incorporation of an ultra-low concentration (0.002 wt%) of dibutyltin dilaurate catalyst was sufficient to enhance curing completeness and mechanical performance while effectively eliminating moisture-induced foaming, a common challenge in solvent-free spray applications. The gel and… More >

Awanda Wira Anggini^1,2, Rita Kartika Sari^1,*, Dede Hermawan¹, Muhammad Iqbal Maulana², Wahyu Hidayat³, Bora Jeong⁴, Muhammad Adly Rahandi Lubis^2,5,*

Journal of Renewable Materials, Vol.14, No.3, 2026, DOI:10.32604/jrm.2025.02025-0114 - 25 March 2026

Abstract Recent advancements in developing tannin-based non-isocyanate polyurethane (NIPU) resins have unlocked new possibilities for sustainable and eco-friendly wood adhesives. Unlike conventional polyurethane, NIPUs eliminate hazardous isocyanates, offering safer alternatives for industrial applications. Tannin, a naturally occurring polyphenolic compound, plays a pivotal role in enhancing these resins’ fire-resistance and super-hydrophobic properties. This review highlights key developments in synthesizing tannin-based NIPU, focusing on various polymerization techniques such as polyaddition, polycondensation, ring-opening polymerization, and rearrangement. These strategies contribute to improved mechanical strength, thermal stability, and resistance to water absorption. Recent studies demonstrate that tannin-based NIPU adhesives meet or… More > Graphic Abstract

Nikita Golovkin^1,2, Olesya Nikulenkova³, Vsevolod Pobezhimov¹, Alexander Nesmelov¹, Sergei Chvalun¹, Fedor Sorokin³, Arthur Krupnin^1,3,*

CMC-Computers, Materials & Continua, Vol.86, No.3, 2026, DOI:10.32604/cmc.2025.073161 - 12 January 2026

Abstract This study presents and verifies a hybrid methodology for reliable determination of parameters in structural rheological models (Zener, Burgers, and Maxwell) describing the viscoelastic behavior of polyurethane specimens manufactured using extrusion-based 3D printing. Through comprehensive testing, including cyclic compression at strain rates ranging from 0.12 to 120 mm/min (0%–15% strain) and creep/relaxation experiments (10%–30% strain), the lumped parameters were independently determined using both analytical and numerical solutions of the models’ differential equations, followed by cross-verification in additional experiments. Numerical solutions for creep and relaxation problems were obtained using finite element analysis, with the three-parameter Mooney-Rivlin… More > Graphic Abstract

Markapudi Bhanu Prasad¹, Borhen Louhichi², Santosh Kumar Sahu^1,*

CMES-Computer Modeling in Engineering & Sciences, Vol.145, No.1, pp. 483-519, 2025, DOI:10.32604/cmes.2025.069395 - 30 October 2025

Abstract This study investigates the mechanical behavior of polyurethane (PU) nanocomposites reinforced with nanodiamonds (NDs) and proposes an integrated optimization–prediction framework that combines the Taguchi method with machine learning (ML). The Taguchi design of experiments (DOE), based on an L9 orthogonal array, was applied to investigate the influence of composite type (pure PU, 0.1 wt.% ND, 0.5 wt.% ND), temperature (145°C–165°C), screw speed (50–70 rpm), and pressure (40–60 bar). The mechanical tests included tensile, hardness, and modulus measurements, performed under varying process parameters. Results showed that the addition of 0.5 wt.% ND substantially improved PU performance,… More >

Dmitry S. Konovalov¹, Natalia N. Saprykina², Vjacheslav V. Zuev^1,2,*

Journal of Renewable Materials, Vol.13, No.10, pp. 2043-2058, 2025, DOI:10.32604/jrm.2025.02025-0079 - 22 October 2025

Abstract In this study, the polyurethanes (PU) were synthesized from 4,4^′-methylene diphenyl diisocyanate and biobased ethoxylated castor oil or one mixture of ethoxylated and neat castor oil by direct mixing method. Utilization of ethoxylated castor oil increases the tensile strength of PU up to 2.75 times (from 3.2 to 8.8 MPa), compared to PU based on neat castor oil. The PU composites filled with birch flour, diatomite, and their mixture were prepared using a homemade dissolver with a cutter-shaped attachment at a speed of 1500 r min⁻¹. The tensile strength of PU composites filled with birch flour… More > Graphic Abstract

Lingyao Zhou, Ling Zhang, Qifan Zhao, Zhanhua Wang, Xili Lu, Guoxia Fei, Lirong He^*, Hesheng Xia^*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.33, No.1, pp. 1-1, 2025, DOI:10.32604/icces.2025.012861

Abstract Powder based high speed sintering (HSS) improves the printing efficiency compared to SLS printing. The shortened layer time for HSS requires quick melting and solidification of powders, which is a big challenge for traditional printing powders materials, especially the viscous elastomers. Herein, a dynamic cross-linked polyurethane containing Diels-Alder bonds (PUDA) was synthesized at kilo scale and used for HSS. The incorporation of dynamic DA bonds into PU enables the dissociation of the polymer chain under IR light heating, and will lead to fast relaxation, diffusion and dis/re-entanglement, addressing the problem of incomplete sintering and weak… More >

Qizhi Chen^1,2, Wensheng Cheng^1,2, Baoping Zou^1,2,*, Bowen Kong^1,2, Yansheng Deng^1,2, Xu Long^3,*

Journal of Polymer Materials, Vol.42, No.2, pp. 463-475, 2025, DOI:10.32604/jpm.2025.064257 - 14 July 2025

Abstract The rapid development of urban rail transit has posed increasing construction and operational challenges for metro tunnels, often leading to structural damage. Grouting technology using cement-based materials is widely applied to address issues such as seepage, leakage, and alignment correction in shield tunnels. This study investigates the additional stress induced by grouting in silty soil layers, using cement-based grouts with different water-to-cement ratios and polyurethane-modified cement-based materials. Results show that additional stress decreases with depth and is more influenced by horizontal distance from the grouting point. In staged grouting, the first injection phase contributes about More >

Zhen-Yu Chen¹, Yue-RU Wang¹, De-Yi Teng¹, Yan-Fang Xue¹, Gui-Chang Jiang^1,2,*

Journal of Polymer Materials, Vol.42, No.2, pp. 359-377, 2025, DOI:10.32604/jpm.2025.063342 - 14 July 2025

Abstract PU, or polyurethane, features a repeating urethane group (-NH-COO-) in its molecular structure. Traditionally, PUs are synthesized from isocyanate and polyol compounds derived from fossil resources through polymerization reactions. The depletion of fossil fuels and the increasing climate problems call for the expansion of more renewable sources of chemicals, such as modern biomass. However, the conversion of biomass into chemicals is challenging due to the inherent molecular complexity of its composition. In recent years, advances in green chemistry have led researchers to focus on developing bio-based polyurethanes by sourcing polyols, isocyanates, and chain extender precursors More >

Baoping Zou^1,2, Jiahao Yin^1,2, Chunhui Cao^1,2,*, Xu Long^3,*

Journal of Polymer Materials, Vol.42, No.1, pp. 255-275, 2025, DOI:10.32604/jpm.2025.062081 - 27 March 2025

Abstract The ongoing operation of subway systems makes existing tunnels vulnerable to deformations and structural damage caused by adjacent foundation pit construction. Such deformations-manifesting as horizontal displacement, heightened lateral convergence, and internal force redistribution-may significantly compromise subway operational safety. Grouting remediation has become a widely adopted solution for tunnel deformation control and structural reinforcement. Developing optimized grouting materials is crucial for improving remediation effectiveness, ensuring structural integrity, and maintaining uninterrupted subway operations. This investigation explores the substitution of fine mortar aggregates with 0.1 mm discarded rubber particles at varying concentrations (0%, 3%, 6%, 9%, 12%, and More >

Nayara Koba de Moura Morgado, Guilherme Ferreira de Melo Morgado, Erick Gabriel Ribeiro dos Anjos, Fabio Roberto Passador^*

Journal of Polymer Materials, Vol.42, No.1, pp. 95-110, 2025, DOI:10.32604/jpm.2025.059364 - 27 March 2025

Abstract The continuous improvement in patient care and recovery is driving the development of innovative materials for medical applications. Medical sutures, essential for securing implants and closing deep wounds, have evolved to incorporate smart materials capable of responding to various stimuli. This study explores the potential of thermoresponsive sutures, made from shape memory materials, that contract upon heating to bring loose stitches closer together, promoting optimal wound closure. We developed nanocomposites based on a blend of poly(lactic acid) (PLA) and thermoplastic polyurethane (TPU)—biopolymers that inherently exhibit shape memory—enhanced with carbon nanotubes (CNT) and graphene nanoplatelets (GN)… More >