Article
Polymer Science
Qing-song Jiang, He-sheng Liu, Xiao-chun Wang, Zhi-xin Hu, Hai-ying Zhou, Hua-rong Nie
Summary: A three-dimensional numerical model considering the wall slip effect and pressure dependence of viscosity was proposed for simulating the fiber orientation in thin-wall injection-molded parts of SGFRPC. The results showed that the three-dimensional numerical model can better predict the fiber orientation, and several important processing parameters were also studied.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Manufacturing
Eric L. Gilmer, David Anderegg, John M. Gardner, Godfrey Sauti, Emilie J. Siochi, Steven H. McKnight, David A. Dillard, Claire McIlroy, Michael J. Bortner
Summary: This study explores the heat transfer, polymer diffusion, and residual stress development in the FFF process of poly(ether imide) using finite difference models. The results indicate that the temperature of a layer is influenced by subsequent printed layers and the molecular mobility and degree of healing are sensitive to reptation time. Small changes in reptation time can lead to significant differences in healing outcomes.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Multidisciplinary
Haitao Fu, Mengyuan Dun, Binhui Chen, Zhifang Zhou, Haigang Wang, Weihong Wang, Yanjun Xie, Qingwen Wang
Summary: By studying the rheological properties of UF-WFPE under continuous deformation, a modified plug flow model was proposed to explain the rheological behavior of UF-WFPE melt. The study found that specimens with 70 wt%, 75 wt%, and 80 wt% WF displayed a stable rheological behavior period during compression, while those with 90 wt% WF entered a continuous fracture stage, lacking a stable rheological behavior period.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Polymer Science
Afni Restasari, Retno Ardianingsih, Luthfia Hajar Abdillah, Hamonangan R. D. Sitompul, Hasan Kurdianto, Hasan al Rasyid, Heri Budi Wibowo, Kendra Hartaya
Summary: The inappropriateness between the composition and casting technique of high density composite solid propellant (HD-CSP) increases the risk of explosion during the casting process. The use of wall slip phenomena as a lubrication effect can make the process safer. Pseudoplasticity, which is involved in the phenomena, plays a crucial role in determining the casting technique. The controlling mechanism of pseudoplasticity, specifically determined by aluminium, remains unclear.
IRANIAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Valentina Mazzanti, Annalisa Fortini, Lorenzo Malagutti, Giulia Ronconi, Francesco Mollica
Summary: This study investigated the effect of a toughening agent on the tribological behavior of wood polymer composites, showing that the agent improved wear resistance but water soaking pre-treatment caused severe damage.
Article
Polymer Science
Krzysztof Wilczynski, Kamila Buziak, Adrian Lewandowski, Andrzej Nastaj, Krzysztof J. Wilczynski
Summary: The study conducted extensive rheological and extrusion modeling on wood polymer composites based on the polypropylene matrix, investigating their unique flow properties and slip effects. Through numerical simulations and experimental validation, it was concluded that the location of the operating point in the extrusion process fundamentally depends on the material's rheological characteristics.
Article
Construction & Building Technology
Daniel Friedrich
Summary: This study investigated the impact of temperature, heating time, bending radius, and fiber content on the mechanical properties and memory behavior of extruded wood-plastic composite (WPC) cladding after thermoforming. The results showed that higher temperatures facilitated forming with smaller radii but significantly decreased strength. Fiber content had a comprehensive influence on the material behavior. For industrial implementation, rupture modulus and retention force should be used for development and process control, while research should focus on compound optimization.
AUTOMATION IN CONSTRUCTION
(2022)
Article
Chemistry, Multidisciplinary
Ying Hong, Lihan Jin, Biao Wang, Junchen Liao, Bing He, Tian Yang, Zhihe Long, Pengyu Li, Zhuomin Zhang, Shiyuan Liu, Youngjin Lee, Bee Luan Khoo, Zhengbao Yang
Summary: This study presents a flexible ultrasonic wireless power transfer system based on wood structures, demonstrating an output power density one order of magnitude higher than the state of the art. Ex vivo and in vivo experiments showcase the potential of this system for improving the quality of life and well-being of recipients of implantable devices.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Multidisciplinary Sciences
Chi Zhang, Mingyang Chen, Sinan Keten, Benoit Coasne, Dominique Derome, Jan Carmeliet
Summary: Wood hygromechanics mechanisms remain unclear due to nanoscopic system size and highly coupled physics. This study uses molecular dynamics simulations to characterize wood polymers, revealing the dominating role of cellulose fiber in wood cell wall mechanics. The moisture-induced anisotropic swelling and weakening of wood cell wall is governed by the interplay of cellulose reinforcement, mechanical degradation of matrix, and fiber-matrix interface.
Review
Polymer Science
Liang Yang, Hong Wang, Yanning Yang
Summary: This paper analyzes the main factors affecting the actuation performance of IPMC and describes three modeling techniques in detail: black box models, gray box models, and white box models. Then, five control methods of IPMC are analyzed and discussed, including proportional integral derivative control, adaptive control, sliding mode control, inverse control, and other control methods. Finally, the model and control of IPMC are summarized, and the future development direction is prospected.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Engineering, Chemical
Alex Thivierge, Jocelyn Bouchard, Andre Desbiens
Summary: This study introduces a state observer to estimate the slip profile in the HPGR working gap, based on force balance equations and Coulomb friction criterion from a series of HPGR tests. It is found that material descends at a slower rate in the compression zone and accelerates as it progresses downward, leading to slipping above the working gap level.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Kamil Kedzierski, Karol Rytel, Boleslaw Barszcz, Lukasz Majchrzycki
Summary: A suspension of SWCNH aggregates was used to create a floating film and transferred onto quartz substrates using the Langmuir-Schaefer technique. The packaging and arrangement of SWCNHs in the film can be controlled during the process. The resulting films have high electrical conductivity and figure of merit values, making them ideal for various applications.
Article
Construction & Building Technology
Siddhartha Arya, Ritesh Kumar, Shakti Chauhan, Bhushan U. Kelkar
Summary: This study aimed to prepare thermoplastic based hybrid wood veneer composite panels using bamboo fiber reinforced thermoplastic (BPC) and Melia dubia wood veneers. The effect of polymer type (PP, HDPE, PBAT) and bamboo fiber content on the properties of the plywood was investigated. Plywood prepared with BPC showed superior mechanical properties, with improved flexural strength and interfacial adhesion between BPC and wood veneers.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Energy & Fuels
Jing Huang, Jinjun Zhang, Wenwen Liu, Yiwei Xie, Qian Huang, Hongying Li
Summary: In this study, adhesive and cohesive fractures were identified as two possible modes of fracture during yield stress measurement of materials such as waxy oil gel. The balance between cohesive strength versus adhesive strength was found to determine the fracture mechanism of gel in the yield stress measurement, while oil composition and test conditions may influence one or both of these strengths.
Article
Materials Science, Composites
Ku Ren, Qinqin Xia, Yongzhuang Liu, Wanke Cheng, Ying Zhu, Yang Liu, Haipeng Yu
Summary: This study successfully synthesized a wood/polyimide composite with superior performance compared to natural wood by utilizing microwave-assisted deep eutectic solvent pretreatment and polyimide impregnation. The composite exhibited enhanced thermal stability, strength, and flame-retardant properties, making it a promising material for applications in extreme environments.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Valentina Mazzanti, Lorenzo Malagutti, Andrea Santoni, Francesca Sbardella, Andrea Calzolari, Fabrizio Sarasini, Francesco Mollica
Article
Engineering, Manufacturing
V Mazzanti, M. Salzano de Luna, R. Pariante, F. Mollica, G. Filippone
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2020)
Review
Polymer Science
Valentina Mazzanti, Francesco Mollica
Article
Dentistry, Oral Surgery & Medicine
Paolo Albertini, Valentina Mazzanti, Francesco Mollica, Luca Lombardo, Giuseppe Siciliani
Summary: This study aimed to determine and compare the play and torque expression of different types of self-ligating and conventionally ligated lingual brackets engaged with archwires of varying characteristics. Results showed that certain brands performed better at higher torsional loads.
JOURNAL OF OROFACIAL ORTHOPEDICS-FORTSCHRITTE DER KIEFERORTHOPADIE
(2022)
Article
Polymer Science
Valentina Mazzanti, Annalisa Fortini, Lorenzo Malagutti, Giulia Ronconi, Francesco Mollica
Summary: This study investigated the effect of a toughening agent on the tribological behavior of wood polymer composites, showing that the agent improved wear resistance but water soaking pre-treatment caused severe damage.
Article
Engineering, Environmental
Matteo Calosi, Marco Renon, Giada Belletti, Valentina Mazzanti, Francesco Mollica, Alessandro Massi, Monica Bertoldo
Summary: This study focuses on the depolymerization of rigid semi-Interpenetrated Polymer Network (semi-IPN) foam based on poly(vinyl chloride) (PVC) and cross-linked polyurea/isocyanurate, aiming to separate and reuse the individual components. By optimizing the glycolysis conditions, the researchers successfully depolymerized the crosslinked portion and recovered PVC with minimal degradation.
Proceedings Paper
Polymer Science
Valentina Mazzanti, Lorenzo Malagutti, Francesca Sbardella, Francesco Mollica
Summary: Wood Polymer Composites (WPCs) are gaining attention as environmentally friendly materials. Increasing wood content reduces the environmental impact, but it also leads to drawbacks such as brittleness and reduced processability. This study focuses on reducing brittleness by adding a toughening agent and finding the optimal processing conditions and elastomer content.
MACROMOLECULAR SYMPOSIA
(2022)
Proceedings Paper
Polymer Science
Lorenzo Malagutti, Valentina Mazzanti, Francesco Mollica
Summary: The Mooney wall slip correction procedure is necessary for rheological characterization of complex fluids that tend to slip at solid walls during capillary viscometry. The imprecise knowledge of the capillary radius in the Mooney procedure can amplify measurement errors, even if the uncertainty is small. This study proposes a MATLAB-based software to determine the maximum allowable inaccuracy of the capillary diameter for feasible data in fluid characterization, with prior knowledge of the unknown fluid's constitutive characteristics being ideal for the best results.
MACROMOLECULAR SYMPOSIA
(2022)
Article
Engineering, Chemical
Lorenzo Malagutti, Giulia Ronconi, Marco Zanelli, Francesco Mollica, Valentina Mazzanti
Summary: Fused-filament fabrication is a popular 3D printing technique, but its mechanical properties limit its use in structural applications. Post-processing methods, such as remelting and compaction, can improve mechanical properties and make the material more isotropic.
Article
Materials Science, Multidisciplinary
Tommaso Ludergnani, Giulia Fredi, Lorenzo Malagutti, Andrea Balbo, Andrea Dorigato, Francesco Mollica, Valentina Mazzanti
Summary: FFF is a low-cost 3D-printing technique that allows for the production of complex geometries with high customization. A two-step metallization method using a non-toxic and cost-effective plating solution is performed to enhance the mechanical and thermal properties of FFF-printed parts. The study finds that an infill density of 50-60% provides the best compromise between mechanical performance and thermal conductivity.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Giada Belletti, Giulia Ronconi, Valentina Mazzanti, Elena Buratti, Lorenzo Marchi, Giovanna Sotgiu, Matteo Calosi, Francesco Mollica, Monica Bertoldo
Summary: This study reports the preparation and characterization of poly(vinyl alcohol) (PVA)/poly(lactic acid) (PLA) blends of different compositions. Films of PLA and its blends with PVA were obtained by drying water dispersions. The morphology of the films showed a PVA-rich continuous phase, except for the 25/75 composition where an inverted phase composition was observed. Trapped air bubbles caused voids in the films and affected their thermal degradation and mechanical properties. Films with a neutral stabilizer showed improved toughness compared to commercial PLA, with properties depending on the composition and arrangement of blend phases.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Dentistry, Oral Surgery & Medicine
Anna Colonna, Margherita Drudi, Giorgio Alfredo Spedicato, Francesco Mollica, Valentina Mazzanti, Emanuele Paoletto, Giuliano Maino, Giuseppe Siciliani, Luca Lombardo
INTERNATIONAL ORTHODONTICS
(2020)
Article
Mechanics
Mateus C. Guimaraes, Fernando T. Pinho, Carlos B. da Silva
Summary: A new theory is proposed to describe the conformation state of polymer chains in free turbulent shear flows of viscoelastic fluids. The theory shows the existence of minimum and maximum solvent dissipation reduction asymptotes and four different polymer deformation regimes, based on self-similarity arguments and new scaling relations for the turbulent flux of conformation tensor. In addition, analytical solutions for the self-similar transverse profiles of the conformation tensor components are obtained. The theory is validated through excellent agreement with direct numerical simulations employing the FENE-P rheological model.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2024)
