Article
Mechanics
Zaryab Shahid, Coleman Gustav Bond, Molly Saylor Johnson, James E. Hubbard, Negar Kalantar, Anastasia Muliana
Summary: Kerfing, also known as relief cutting, is a technique to create flexible freeform surfaces from rigid planar surfaces. This study focuses on the dynamic response of kerf structures, including mode shapes, resonance frequencies, and stress wave propagation. The findings show that the cut density and unit cell size of kerf structures can affect their modal behaviors, and the flexibility and reconfigurability of kerf panels can alter their dynamic response. These findings are valuable for designing architectural structures with desired performance requirements.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Polymer Science
Xiangyu Li, Tongfei Wu
Summary: Dynamic covalent polymers based on imine bond (FPIs) are capable of reorganizing their molecular structure. The rheological behavior of FPIs is similar to that of static linear entangled polymers predicted by Likhtman-McLeish theory, influenced by the dynamic chain arrangements caused by imine-bond exchange.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Mohammadreza Nofar, Beril Saadet Yenigul, Burcu Ozdemir, Ceren Yargici Kovanci, Abbas Ghanbari, Amirjalal Jalali
Summary: In this study, rPE based MFCs were developed by incorporating rPET and rPA as reinforcing fibrillar phases at a given weight ratio. The effects of extrusion and injection molding temperatures on fibrillar structure and properties were explored. EnBAGMA and MAH-g-PE acted as compatibilizers, refining the fibrillar structure and significantly influencing mechanical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Mechanics
Pierre Lemerle
Summary: Viscoelastic materials are commonly used for vibroacoustic solutions due to their ability to dissipate energy and mitigate vibrations. Wave propagation methods analyze waveform patterns in one-dimensional structures to determine material properties. Adapting these methods for shorter samples allows for more precise measurements, representing a significant advancement in material characterization.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2021)
Article
Multidisciplinary Sciences
Ryan W. Clarke, Tobias Sandmeier, Kevin A. Franklin, Dominik Reich, Xiao Zhang, Nayan Vengallur, Tarak K. Patra, Robert J. Tannenbaum, Sabin Adhikari, Sanat K. Kumar, Tomislav Rovis, Eugene Y. -X. Chen
Summary: The global plastics problem has a significant impact on the environment, energy, and climate. Various innovative strategies have been proposed to address these issues and achieve a circular economy. However, the challenge of reusing mixed-plastics waste remains, as there is currently no effective closed-loop solution.
Article
Energy & Fuels
Lianzeng Chai, Shaobo Chai, Pei Li, Jinhao Liu, Boyang Song, Xianpeng Li
Summary: This study analyzes stress wave propagation in filled jointed rock mass with viscoelastic properties based on the time-domain recursive analysis method. The results show that the amplitude attenuation and time delay of stress wave in rock mass with small cracks are influenced by the rock's viscoelastic behavior. The transmission and reflection characteristics of P-wave in filled jointed rock mass decrease significantly due to the attenuation effect of rock viscoelasticity, but stabilize as the quality factor increases.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Acoustics
Max Gattin, Nicolas Bochud, Giuseppe Rosi, Quentin Grossman, Davide Ruffoni, Salah Naili
Summary: Photopolymer-based additive manufacturing has gained attention in acoustics for designing tissue-mimicking phantoms and ultrasound components. This study investigated the longitudinal and transverse bulk properties of photopolymer materials using a double through-transmission method. The results showed that these properties are sensitive to slight variations in the manufacturing process.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Polymer Science
Yu Chen, Tian Tang, Cagri Ayranci
Summary: This study investigates the effect of moisture on the mechanical properties of PLA and finds that the increase in moisture content leads to a decrease in instantaneous elastic compliance and a more flattened creep curve, indicating the existence of water-bridge-anti-plasticization effect. The findings highlight the importance of considering moisture's anti-plasticization effect on the viscoelasticity of PLA and provide a methodology for evaluating PLA's viscoelasticity for different applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Composites
Amirreza Zabihi, Mohammad Fasihi, Sajad Rasouli, Rahida Wati Sharudin
Summary: The effects of silicon carbide (SiC) as a thermal conductive filler on styrene-butadiene-rubber/butadiene rubber (SBR/BR) were investigated. The addition of SiC improved the mechanical properties, physical properties, and curing kinetics of the composite. However, particle agglomeration of SiC after a certain content reduced its performance in the composite.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Chulmin Youn, Hyeon Jung Gwak, Younghwan Bae, Dokun Kim, Byeong Jin Yeang, Song Jun Doh, Sang Young Yeo
Summary: This study investigated the effect of thermal drawing process on the mechanical properties of PEI filaments. The results showed that optimizing the draw ratio, process temperature, and cooling temperature can lead to PEI filaments with excellent mechanical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Ioannis Ioannou, Paraskevas Kyriacou, Marios Pantelas, Ioannis Pashalidis, John Makris, Spyros Rallis, Giachalis Kostas, Kyriakos Avraam, Theodora Krasia-Christoforou
Summary: The study focuses on the fabrication and thermomechanical characterization of fully recycled composite materials based on HDPE reinforced with bio-natural carbonized Luffa cylindrica inclusions. The use of the twin roll mill process enabled the production of polymer composites with variable c-LC content, with morphological and thermomechanical analysis confirming the reinforcing effect of biochar inclusions on HDPE thermoplastic. This opens the way for the potential use of such fully-recycled biochar thermoplastic composite materials in structural and semi-structural applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Mohammad M. Afroz, Yun Kyung Shin, Adri C. T. van Duin, Katie D. Li-Oakey
Summary: In this study, we used the ReaxFF simulation method to investigate the physiochemical and mechanical properties, as well as the stimuli response behavior, of a shape-memory polyurethane (SMPU) rigid segment. We developed models for both crystalline and amorphous forms of a common rigid segment of SMPUs and performed molecular dynamics simulations to predict their structural and physiochemical properties. This study provides a theoretical pathway for the application-oriented design of high-performance SMPUs in fields such as soft robotics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Luis A. Chavez, Paulina Ibave, Md Sahid Hassan, Samuel E. Hall-Sanchez, Kazi Md Masum Billah, Alba Leyva, Cory Marquez, David Espalin, Sabrina Torres, Thomas Robison, Yirong Lin
Summary: This study demonstrates a method to fabricate and engineer HPP using a desktop SLS printer by blending a high-performance polymer with a commercial low-temperature polymer and implementing post-processing heat treatments. The treated blends exhibited significantly improved mechanical properties and thermal resistance compared to PA-12 alone.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yi He, Dong Li, Na Zhou, Lin Gan, Jin Huang
Summary: A strategy of transforming cell shape from convex to concave through viscoelastic compression was proposed, aiming to reverse the Poisson's ratio of biomass foam to negative and enhance its compression and shockproof properties. The preparation of poly(butylene succinate) foam with negative Poisson's ratio (NPR) showed significant improvements in compressive modulus, storage modulus, and loss modulus, indicating the universal potential of viscoelastic compression for reinforcing biomass foam materials.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Materials Science, Composites
Shuai Li, Tianyu Wang, Jiqiang Hu, Bing Wang, Yingze Li, Lianchao Wang, Gao Li, Jialin Zhang, Zhengong Zhou
Summary: PEEK-HA composites show impaired tensile/bending strength and elongation at break with increasing HA content, but improved modulus. The compressive strength and modulus of PEEK-HA are enhanced with increasing HA amount. Smaller HA particle size in PEEK-HA leads to higher tensile/bending performance and lower compressive properties. In vitro osteogenesis tests reveal that higher HA content and smaller particle size result in more evenly flattened cells with increased cytoplasmic processes. The PEEK-HA composite with 20 wt% HA content and 20 nm particle size shows optimal osteogenesis performance while maintaining sufficient mechanical properties.
POLYMER COMPOSITES
(2021)
Article
Green & Sustainable Science & Technology
Sanosh Kunjalukkal Padmanabhan, Francesca Lionetto, Rossella Nisi, Mariangela Stoppa, Antonio Licciulli
Summary: In this study, an economical and environmentally friendly method for synthesizing bacterial cellulose (BC) using orange peel extract was evaluated. It was found that orange peel extract can be effectively used as a carbon source for BC production, resulting in BC with high crystallinity and nanofibrous structure. This suggests that orange peel extract can be a valuable resource for the production of high-value BC.
Article
Materials Science, Composites
Francesco Nicassio, Alfonso Maffezzoli, Giuseppe Buccoliero, Gennaro Scarselli
Summary: This study tested a thermoplastic matrix composite flat panel stiffened by induction welded stringers, with a focus on investigating its shear buckling behavior. A finite element model was developed and compared with experimental results to understand the panel's buckling and postbuckling behavior.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Physical
Hesam Mehdikhani, Amir Mostafapour, Hossein Laieghi, Reza Najjar, Francesca Lionetto
Summary: This study presents a feasible route for joining polymer pipes using an orbital friction stir welding (OFSW) set-up with a retractable pin tool. The joined pipes achieved fully consolidated joints with high-quality weld surfaces and no defects. The samples welded with the optimum parameters showed comparable properties with the base materials and even a slight increase in tensile strength.
Article
Biochemistry & Molecular Biology
Nunzia Gallo, Alberta Terzi, Teresa Sibillano, Cinzia Giannini, Annalia Masi, Alessandro Sicuro, Federica Stella Blasi, Angelo Corallo, Antonio Pennetta, Giuseppe Egidio De Benedetto, Francesco Montagna, Alfonso Maffezzoli, Alessandro Sannino, Luca Salvatore
Summary: In the last two decades, fish industry by-products have been used to extract type I collagen due to issues with traditional mammalian tissue extraction. This study focused on fish by-products from aquaponic plants as a source of biopolymers, aiming to create eco-friendly and profitable materials. The research evaluated the impact of age on the properties of Tilapia skin for collagen extraction, identifying significant age-related differences in thickness, collagen fiber bundle diameter, organization, orientation, thermal properties, mechanical properties, and composition.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Environmental
Francesca Lionetto, Carola Esposito Corcione, Francesco Messa, Serena Perrone, Antonio Salomone, Alfonso Maffezzoli
Summary: This study investigates the challenges associated with adsorption studies of contaminants on microplastics (MPs) in the marine environment and explores the adsorption of amoxicillin on different types of MPs. The results show that aged MPs absorb a higher antibiotic content than unaged ones due to their different specific surface areas. The thermodynamic affinity between amoxicillin and PET MPs is analyzed through Hansen's solubility parameters, and a potential interaction mechanism based on hydrogen bonding is hypothesized. Additionally, it is found that PET MPs can serve as carriers for pollutant transport in the aquatic environment.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Materials Science, Composites
Fabio De Pascalis, Francesca Lionetto, Alfonso Maffezzoli, Michele Nacucchi
Summary: A general method of predicting the stiffness tensor of short-fiber composites has been presented in this study, based on the fabric tensor obtained from X-ray computed tomography. The method does not rely on the specific type of fabric tensor used to characterize the symmetry properties of the composite. Experimental data from thermoplastic composite matrices reinforced with short carbon and basalt fibers were used to validate the method. The statistical alignment of fibers in each portion of the sample was measured to calculate the components of the stiffness tensor.
POLYMER COMPOSITES
(2023)
Review
Polymer Science
Zahra Rajabimashhadi, Nunzia Gallo, Luca Salvatore, Francesca Lionetto
Summary: Fish collagen has gained attention in recent decades for its potential applications in various health-related industries. Its advantages over mammalian-based collagen, such as reduced zoonosis transmission risk and cost-effective manufacturing process, have led to the expansion of using collagen derived from fish wastes. This review summarizes the recent advances in extracting collagen from fish industry wastes for several applications and discusses the challenges in the fish-collagen market.
Review
Polymer Science
Andrea Dei Sommi, Francesca Lionetto, Alfonso Maffezzoli
Summary: Liquid composite molding (LCM) is a fast and cheap process for fabricating large parts with good properties. The filling stage, which involves impregnating a reinforcing fiber preform with low-viscosity resin, relies on Darcy's permeability. This review summarizes the most commonly used methods for permeability measurement in LCM.
Article
Polymer Science
Lucia D'Accolti, Alessia De Cataldo, Francesco Montagna, Carola Esposito Corcione, Alfonso Maffezzoli
Summary: This study presents a new method using recyclable 3D-printed polylactic acid (PLA) scaffolds coated with iron oxide catalyst for Fenton reactions on aromatic model molecules. The results show that the scaffolds have advantages of easier handling and waste reduction, leading to a reduction in times and costs. The catalyst coating has limited leachability and can be easily recovered and reused multiple times.
Article
Engineering, Multidisciplinary
Andrea Dei Sommi, Giuseppe Buccoliero, Francesca Lionetto, Fabio De Pascalis, Michele Nacucchi, Alfonso Maffezzoli
Summary: The purpose of this study was to develop a multiphysic model to predict the conditions leading to water-generated porosity in autoclave lamination of composite parts, and to prevent their presence by modifying the process parameters. The model was proven effective in predicting and avoiding porosity development in epoxy matrix carbon fiber reinforced laminates exposed to a moist environment.
COMPOSITES PART B-ENGINEERING
(2023)
Proceedings Paper
Polymer Science
Antonio Greco, Francesca Ferrari, Alfonso Maffezzoli
Summary: This study aims to investigate the suitability of plasticized polylactic acid (PLA) using two cardanol derivatives, cardanol (CA) and epoxidized cardanol acetate (ECA), in two different processing techniques, injection molding and rotational molding. The crystallization kinetics of plasticized PLA were initially studied, with poly(ethylene glycol) (PEG) shown to significantly increase the rate of crystallization during cooling. The two different processing techniques, characterized by different cooling rates, resulted in the production of either amorphous or crystalline samples, with CA and ECA allowing for the production of amorphous samples even in rotational molding, thus retaining good toughness.
PROCEEDINGS OF THE 36TH CONFERENCE OF THE POLYMER PROCESSING SOCIETY, PPS36
(2023)