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SSRN 2025年

作者： Nicolae, Carmen-Valentina Jahani Kadousaraei, Masoumeh Yamada, Shuntaro Aydin, Mehmet Serhat Al-Sharabi, Niyaz Campodoni, Elisabetta Sandri, Monica Steinmüller-Nethl, Doris Syverud, Kristin Rashad, Ahmad Stancu, Izabela Cristina Mustafa, Kamal Advanced Polymer Materials Group University Politehnica of Bucharest 1-7 Gh. Polizu Street Bucharest011061 Romania Center of Translational Oral Research Department of Clinical Dentistry Faculty of Medicine University of Bergen Bergen Norway CNR-ISTEC Institute of Science and Technology for Ceramics National Research Council of Italy Faenza Italy DiaCoating GmbH Wattens Austria RISE PFI AS Trondheim Norway Bioengineering Graduate Program Aerospace and Mechanical Engineering University of Notre Dame Notre DameIN46556 United States

The development of bioinks for bone tissue engineering (BTE) requires a precise balance of printability, stability and bioactivity to ensure cell viability while supporting cell attachment, proliferation and osteogenic differentiation. Although numerous bioink formulations for BTE demonstrate good printability and bioactivity, they often lack the stability or osteogenic potential required to support long-term bone regeneration. To address these limitations, we developed multicomponent formulations for extrusion-based bioprinting by combining TEMPO-oxidized cellulose nanofibrils (TO-CNFs) with gelatin methacryloyl (GelMA) and sodium alginate (SA). The formulation was further loaded with nanodiamond particles (NDs), magnesium-doped nanohydroxyapatite (MgHA) or a combination of both to impart synergistic effects. This study investigates the individual and combined effects of NDs and MgHA on the printability, structural integrity, biocompatibility, and osteogenic performance of the bioink, hypothesizing that a dual nanoparticle system could provide superior multifunctionality. Rheological and printability tests confirmed that the incorporation of NDs improved the structural integrity and printing fidelity of the printed structures, with all formulations showing comparable mechanical properties. Seeded human gingival fibroblasts showed enhanced viability and spreading, and favorable metabolic activity and proliferation on ND-containing hydrogels. While the viability and elongation of bioprinted osteoblast-like cells in all four bioinks were comparable, MgHA-containing bioinks promoted osteogenic differentiation of osteoblasts, shown by increased Runx2 expression, ALP activity, and biomineralization. These findings suggest that the combined incorporation of NDs and MgHA within the TO-CNFs-GelMA-SA matrix provides a promising platform with robust printability and enhanced bioactivity, addressing the current trade-offs in the design of bioinks for comprehensive BTE. © 2025,

关键词： Bone

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Novel Membranes Regenerated from Blends of Cellulose/Gluten Using Ethylenediamine/Potassium Thiocyanate Solvent System

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Journal of Renewable Materials 2019年第1期7卷 41-55页

作者： Yang Yu Ramiz Boy Richard Kotek Fiber and Polymer Science Program College of TextilesNorth Carolina State UniversityRaleighNC 27606USA Department Textile Engineering Çorlu Faculty of EngineeringTekirdağNamık Kemal UniversityTekirdağ59860TURKEY

Current industrial methods for dissolution of cellulose in making regenerated cellulose products are relatively expensive,toxic and dangerous and have environmental problems coming with the hazard chemical *** solve these problems,a novel ethylenediamine and potassium thiocyanate(ED/KSCN)solvent system was developed,that is economical,ecofriendly,and highly *** ED/KSCN solvent system was proven to be a suitable solvent for fabricating cellulose(blended with other polymers)*** this study,gluten was used to develop nonporous membranes with *** method of casting these membranes provided better ones than the former researchers’*** composite membranes’physical and mechanical properties were studied by analysis of morphology,viscosity,crystallinity,thermal behaviors,tensile properties and water absorption of *** showed that membranes are nonporous,uniform,strong,flexible,ecofriendly and *** and physical properties were influenced by the ratio of cellulose/*** blending 40% gluten,the tensile strength of cellulose membrane dropped to 15.89 MPa from 35.11 ***,its elongation at break increased from 35.3% to 57.02% accordingly.

关键词： Cellulose gluten blended film novel ED/KSCN solvent physical and mechanical properties

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Effects of sequential plasma modification and alkali treatment applied to cellulose fibers on the properties of the paper

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Nordic Pulp and Paper Research Journal 2025年

作者： Ugurdan, Meral Coban Aytac, Ayşe Department of Chemical Engineering Engineering Faculty Kocaeli University Kocaeli41380 Turkey Polymer Science and Technology Program Kocaeli University Kocaeli41380 Turkey Department of Research & Development Department of Patent Hayat Kimya A.S. Kocaeli41275 Turkey

This study investigates the effects of plasma treatment, alkaline treatment, and their sequential application on eucalyptus cellulose fibers and laboratory-made paper sheets. Handsheet samples were prepared from eucalyptus cellulose under four different conditions: untreated (control), plasma-treated, alkaline-treated, and plasma-treated followed by alkaline treatment. The untreated eucalyptus cellulose handsheets served as the control group. Plasma treatment was performed in air under a vacuum of 89.2 kPa using a 100 kHz radio frequency at a flow rate of 0.6 L/min. The samples were exposed to 200 W of radio frequency power for 2 min on both sides. Alkaline treatment was applied at concentrations of 1 and 3 wt%. In the sequential treatment, the alkaline solution was applied at the same concentrations following plasma modification on both sides under the same conditions. An increase in plasma intensity and treatment duration resulted in a decrease in dry tensile strength. Overall, the use of modified fibers had a significant impact on the water absorption properties of the handsheets. This study highlights the potential of sequential fiber modification to enhance paper properties and supports the development of more sustainable paper-based products. © 2025 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Plasma deposition

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Machine Learning Prediction on the Fractional Free Volume of polymer Membranes

SSRN

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SSRN 2022年

作者： Tao, Lei He, Jinlong Arbaugh, Tom McCutcheon, Jeffrey R. Li, Ying Department of Mechanical Engineering University of Connecticut StorrsCT06269 United States Department of Physics Wesleyan University MiddletownCT06459 United States Department of Chemical & Biomolecular Engineering Center for Environmental Sciences and Engineering University of Connecticut StorrsCT06269 United States Polymer Program Institute of Materials Science University of Connecticut StorrsCT06269 United States Department of Mechanical Engineering University of Wisconsin-Madison MadisonWI53706 United States

Fractional free volume (FFV) characterizes the microstructural level features of polymers and affects their properties including thermal, mechanical, and separation performance. Experimental measurements and theoretical analyses have been used to quantify the FFV of polymers, but challenges remain because of their limitations. Experimental measurements are laborious and based on semi-empirical equations, while Bondi’s group contribution theory involves ambiguities like the determination of van der Waals volume and the choice of factor values in the theoretical equation. To efficiently evaluate the FFV of polymers, this study utilizes high-throughput molecular dynamics (MD) simulations to build a large dataset regarding polymer’s FFV. Based on this large dataset, we further build machine learning (ML) models to establish the composition-structure relation. Inspired by group contribution theory which correlates polymer’s functional groups to FFV, our ML models correlate polymer’s sub-structures or physico-chemical indexes to FFV. Our study first benchmarks the MD simulation protocol to obtain reliable FFV of polymers and then carries out high-throughput MD simulations for more than 6,500 homopolymers and 1,400 polyamides. Such a large and diverse dataset makes the well-trained ML models more generalizable, compared with the group contribution theory. The efficiency of a feed-forward neural network model is further demonstrated by applying it to a hypothetical polyimide dataset of more than 8 million chemical structures. The predicted FFVs of hypothetical polyimides are further validated by MD simulations. The obtained FFVs of the 8 million polymers, plus their previously reported gas separation performances, demonstrate the promising capability of ML virtual screening for the discovery of polymer membranes with exceptional permeability/selectivity. © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

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Silane-coupled kenaf fiber filled thermoplastic elastomer based on recycled high density polyethylene/natural rubber blends

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Polimeros 2021年第2期31卷

作者： Viet, Cao Xuan Ismail, Hanafi Masa, Abdulhakim Hayeemasae, Nabil Department of Polymer Materials Faculty of Materials Technology Ho Chi Minh City University of Technology - HCMUT Ho Chi Minh City Viet Nam School of Materials and Mineral Resources Engineering Universiti Sains Malaysia Engineering Campus Nibong Tebal Penang Malaysia Rubber Engineering and Technology Program International College Prince of Songkla University Hat Yai Songkhla Thailand Department of Rubber Technology and Polymer Science Faculty of Science and Technology Prince of Songkla University Pattani Campus Pattani Thailand

A silane coupling agent, namely γ-aminopropyltriethoxysilane (APS), was used to modify kenaf powder (KP). It was then used as filler in a thermoplastic elastomer (TPE) based on Recycled High Density Polyethylene/Natural Rubber Blends (rHDPE/NR). The attachment of silane onto KP was verified by Fourier Transform Infrared Spectroscopy (FTIR), while the performance of the TPE was assessed in terms of mechanical and thermal properties. The results revealed that specific functional groups of APS were efficiently grafted onto the KP. Tensile strength was improved by the modification with silane and this also affected Young's modulus of the TPE. Also, improved thermal stability was confirmed by thermogravimetric analysis (TGA), as the degradation temperature increased upon inclusion of silane. These effects are attributed to improved compatibility of the KP and rHDPE/NR blend. Such compatibilizing effect was confirmed by Differential Scanning Calorimetry (DSC) that indicated significantly increased crystallinity after the modification with silane. © 2021 Associacao Brasileira de Polimeros. All rights reserved.

关键词： Rubber

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Imaging Ionic Aggregates in Zn-Neutralized Sulfonated Polystyrene Ionomers: Shape and Spatial Heterogeneity

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Microscopy and Microanalysis 2020年第S2期6卷 1112-1113页

作者： Brian P. Kirkmeyer Robert A. Weiss Karen I. Winey Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania19104- 6272 Polymer Science Program and Department of Chemical Engineering University of Connecticut Storrs Connecticut06269-3136

Ionomers are ionically-associating copolymers whose distinctive rheological and mechanical properties arise from the formation of ionic aggregates. The ionic aggregates form when dipoles of minority anionic polymer backbone segments and cationic neutralizing species locally associate and dissociate among each other. Specific ionomer properties depend upon the base copolymer, the minority constituent and the neutralizing agent. One system that has been studied extensively is sulfonated polystyrene ionomer neutralized with Zn (Zn-SPS). The most common technique to date for studying ionomer morphology is small-angle x-ray scattering (SAXS). This technique has provided quantitative information about the aggregate morphology by imposing morphology models that have not been independently *** the present study, we demonstrate the capability to directly image the ionic aggregates of Zn-SPS ionomers using scanning transmission electron microscopy (STEM). This method will allow us to confirm or deny the competing morphological models applied to SAXS data. We have applied similar methods to polyethylene-based ionomers.

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The CNC dispersion quality in various PLA grades

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AIP Conference Proceedings 2023年第1期2607卷

作者： Emre Vatansever Dogan Arslan Deniz Sema Sarul Mohammadreza Nofar Polymer Science and Technology Program Istanbul Technical University Maslak Istanbul 34469 Turkey Metallurgical & Materials Engineering Department Faculty of Chemical and Metallurgical Engineering Istanbul Technical University Maslak Istanbul 34469 Turkey

In this study, the effect of molecular weight and crystallizability of PLA matrix on the PLA/CNC nanocomposite morphology was systematically investigated using rheological experiments. PLA/CNC nanocomposites containing 1, 3, 5, 7, and 10 wt% of CNC were prepared using solution casting method. The comparison of the effect of PLA molecular weight indicated that CNC could form a percolation network at lower contents when low molecular weight PLA was used as the matrix. This finding attributed to the easier interpenetration of shorter PLA chains and CNC nanoparticles in the solvent. On the other hand, it was observed that the use of PLA with higher crystallizability caused further reduction of the onset of CNC percolation network concentrations. This was because during the solvent evaporation step, which was at around 85°C, the isothermal cold crystallization of PLA around the dispersed CNCs could become more favorable and thereby the heterogeneous crystal nucleation could prevent the driving force of the CNCs towards aggregation.

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Mechanistic data science for modeling and design of aerospace composite materials

arXiv

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arXiv 2021年

作者： Mojumder, Satyajit Tao, Lei Li, Ying Liu, Wing Kam Theoretical and Applied Mechanics Program Northwestern University EvanstonIL60208 United States Department of Mechanical Engineering University of Connecticut StorrsCT06269 United States Polymer Program Institute of Materials Science University of Connecticut StorrsCT06269 United States Department of Mechanical Engineering Northwestern University EvanstonIL60208 United States

polymer matrix composites exhibit remarkable lightweight and high strength properties that make them attractive for aerospace applications. Constituents' materials such as advanced polymers and fibers or fillers with their hierarchical structure embed these exceptional properties to the composite materials. This hierarchical structure in multiple length scales provides an opportunity for designing the composite materials for optimized properties. However, the high dimensional design space for the constituents' materials and architectures choice of the composites makes it a challenging design problem. To tackle this high dimensional design space, a systematic, efficient approach named mechanistic data science framework is proposed in this work to identify the governing mechanisms of materials systems from the limited available data and create a composite knowledge database. Our composite knowledge database comprises the knowledge of polymers at the nanoscale with nano reinforcement, the unidirectional structure at the microscale, and woven structure at mesoscale mechanisms that can be further used for the part scale composite design and analysis. The mechanistic data science framework presented in this work can be further extended to other materials systems that will provide the materials designer with the necessary tools to evaluate a new materials system design rapidly. © 2021, CC BY-NC-ND.

关键词： polymer matrix composites

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Effect of polyvinylidene fluoride concentration in PVDF-TiO₂-PVP composite membranes properties and its performance in bovine serum albumin rejection

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Case Studies in Chemical and Environmental engineering 2024年 9卷

作者： Gayatri, Rianyza Fizal, Ahmad Noor Syimir Yuliwati, Erna Zailani, Muhamad Zulhilmi Jaafar, Juhana Hossain, Md Sohrab Zulkifli, Muzafar Taweepreda, Wirach Ahmad Yahaya, Ahmad Naim Polymer Science Program Division of Physical Science Faculty of Science Prince of Songkla University Hat-Yai Songkhla 90110 Thailand Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Alor Gajah Melaka 78000 Malaysia Centre for Sustainability of Ecosystem & Earth Resources (Pusat ALAM) Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob Pahang Gambang 26300 Malaysia Program Study of Chemical Engineering Faculty of Engineering Universitas Muhammadiyah Palembang Jalan A.Yani 13 Ulu Kota Palembang 30263 Indonesia Advanced Membrane Technology Research Centre (AMTEC) Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor Skudai 81310 Malaysia HICoE-Centre for Biofuel and Biochemical Research Institute of Self-Sustainable Building Department of Fundamental and Applied Sciences Universiti Teknologi PETRONAS Perak Darul Ridzuan Seri Iskandar 32610 Malaysia Green Chemistry and Sustainability Cluster Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and BioEngineering Technology Alor Gajah Melaka 78000 Malaysia

In the present study, the polyvinylidene fluoride (PVDF) was incorporated with polyvinylpyrrolidone (PVP) and titanium dioxide (TiO2) nanoparticles to prepare PVDF-TiO2-PVP composite membrane for Bovine Serum Albumin ... 详细信息

In the present study, the polyvinylidene fluoride (PVDF) was incorporated with polyvinylpyrrolidone (PVP) and titanium dioxide (TiO₂) nanoparticles to prepare PVDF-TiO₂-PVP composite membrane for Bovine Serum Albumin (BSA) rejection from protein contaminated wastewater. The preparation of PVDF-TiO₂-PVP composite membrane was conducted by a non-solvent phase inversion (NIPS) process with varying PVDF weight percentages ranging from 16 to 19 wt%. The polymer concentration plays a critical role in the formation of composite membranes that is commonly overlooked. The primary goal of this study is to examine how the concentration of polymers affects the process of membrane creation, the ensuing structure, and the properties of these membranes. Presently, there is a restricted comprehension concerning the impact of PVDF polymer concentration in the fabrication of membranes using the NIPS approach, particularly for PVDF-TiO₂-PVP composite membranes. FE-SEM analysis revealed the lowest skin layer thickness and the number of macro-void formations in a PVDF composite membrane were at 16 wt% PVDF, compared to composite membranes over higher PVDF concentrations from 17 to 19 wt%. There were only slight variations in the percentages of individual elements across all PVDF-TiO₂-PVP membranes, yet the values were identical for C, O, F, and Ti. The viscosity was lowest at 16 wt percent PVDF (576.5 MPa s) and greatest at 19 wt percent PVDF (2054.3 MPa s). It showed that 19%wt PVDF viscosity increased fourfold higher than 16%wt. As the concentration of PVDF was increased, a related decrease in the surface porosity of the membrane was observed. The highest hydrophobicity with the contact angle of 79.62° of the composite membranes were detected at 19 wt% of PVDF loading. The maximum water flux (265.43 L/m²h) and BSA flux (250.31 L/m²h) were obtained at 19 wt% of PVDF loading. The lowest PVDF concentration of 16

关键词： Bovine serum albumin rejection Composite membrane Flat sheet Membrane separation polymeric composite

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Sharma et al. Reply:

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Physical Review Letters 2022年第21期128卷 219602-219602页

作者： Keshav Sharma Nathalia L. Costa Yoong Ahm Kim Hiroyuki Muramatsu Newton M. Barbosa Neto Luiz G. P. Martins Jing Kong Alexandre Rocha Paschoal Paulo T. Araujo Department of Physics and Astronomy University of Alabama Tuscaloosa 35487 Alabama USA Department of Physics Federal University of Ceara Fortaleza 60455-760 Ceara Brazil Department of Polymer Engineering School of Polymer Science and Engineering and Alan G. MacDiarmid Energy Research Institute Chonnam National University 77 Yongbong-ro Buk-gu Gwangju 61186 Republic of Korea Research Institute for Supra-Materials Shinshu University 4-17-1 Wakasato 380-8553 Nagano Japan Institute of Natural Sciences Graduate Program in Physics Federal University of Para Belem 66075-110 Brazil Department of Physics Massachusetts Institute of Technology Cambridge 02139 Massachusetts USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge 02139 Massachusetts USA

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