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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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A concise tutorial review of Reverse Osmosis and Electrodialysis

arXiv

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arXiv 2021年

作者： Biesheuvel, P.M. Porada, S. Elimelech, M. Dykstra, J.E. Wetsus European Centre of Excellence for Sustainable Water Technology Leeuwarden Netherlands Department of Process Engineering and Technology of Polymer and Carbon Materials Wroclaw University of Science and Technology Poland Department of Chemical and Environmental Engineering Yale University New HavenCT United States Environmental Technology Wageningen University Netherlands

Reverse osmosis (RO) and electrodialysis (ED) are the two most important membrane technologies for water desalination and treatment. Their modes of operation and transport mechanisms are very different, but on a closer look also have many similarities. In this concise version of our tutorial review, we describe state-of-the-art theory for both processes, focusing on simple examples that are helpful for the non-specialist and useful for classroom teaching. Both processes are described by the solution (SF) theory which combines ion and water transport across membranes with chemical and mechanical equilibrium at membrane/solution interfaces. We present a derivation of SF theory based on force balances on water and ions and show how the various terms, convection, diffusion, and electromigration, are derived, and how solute partitioning is implemented. Finally, we demonstrate how SF theory accurately describes the osmosis experiment where water and ions are transported in opposite directions across a membrane. Copyright © 2021, The Authors. All rights reserved.

关键词： Reverse osmosis

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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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The potential of pervaporation for biofuel recovery from fermentation:An energy consumption point of view

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Chinese Journal of Chemical engineering 2019年第6期27卷 1296-1306页

作者： Peiyao Zheng Chong Li NaixinWang Jie Li Quanfu An MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science&EngineeringZhejiang UniversityHangzhou 310027China Beijing Key Laboratory for Green Catalysis and Separation College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China

Recovering alcohols from dilute fermentation broth is an emergent task in bio-fuel production process. Since they are primary planned for fuels, energy required to separate these alcohols should be considered in evaluating the potential of a separation technology. A membrane-based process, pervaporation, is of special interest because of its environmental friendliness and easy integrating character. This review probes into the fundamentals of pervaporation especially in terms of the heat required for evaporation. Meanwhile, the separation data of the most representative alcohol-selective pervaporation membranes reported in the literatures are collected and compared with the vapor–liquid equilibrium curve, which represents the distillation selectivity. They include:inorganic membranes, silicon rubber based membranes, Mixed Matrix Membranes and some other special materials. By doing so, the status of alcohol recovery via pervaporation would be more clear for *** ethanol recovery, it is selectivity rather than flux that is in urgent need of solution. While for butanol recovery,membranes with satisfactory selectivity have been developed, increasing the separation capacity would be more pressing.

关键词： Bio-alcohol Pervaporation Energy Selectivity Vapor-liquid equilibrium

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Nanostructured Multicomponent Bioinks with Nanodiamond and Magnesium-Doped Nanohydroxyapatite for Enhanced Bone Tissue engineering

SSRN

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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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Sharma et al. Reply:

引用

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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A facile strategy for the preparation of end-capped and cross-linkable poly(propylene carbonate) with high performance

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Advanced Industrial and engineering polymer Research 2019年第4期2卷 161-166页

作者： Song, Pengfei Ran, Baocheng Shang, Yingqi Kang, Li Chen, Yalun Sun, Luyi College of Chemistry and Chemical Engineering Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education Key Laboratory of Eco-environmental Polymer Materials of Gansu Province Northwest Normal University Lanzhou730070 China Polymer Program Institute of Materials Science Department of Chemical & Biomolecular Engineering University of Connecticut StorrsCT06269 United States

Itaconic anhydride (IAn) was firstly used for the modification of poly(propylene carbonate) (PPC) by solution blending following with the direct heating treatment, producing end-capped and cross-linkable PPC (PECPPC) with high performance. The reaction of PPC with IAn was detailed investigated and the structure of PECPPC was identified by FTIR and 1H NMR. A facile strategy including end-capping and cross-linking can be developed to improve the performance of PPC. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) measurements revealed that the glass transition temperature (Tg) and thermal decomposition temperature (Td) of PECPPCs are all much higher than those of PPC and increased with the increasing content of IAn. Tensile tests also showed the huge enhancement on the mechanical properties of PPC with the end-capping and cross-linking techniques, and the highest tensile strength of PECPPC4 is 37.5 MPa. Furthermore, ECPPC4 exhibits high hydrolysis rate in phosphate buffer solution (PBS) than that of PPC. It is demonstrated that the strategy with the combination of end-capping and cross-linking is efficient for the perfect modification of PPC with IAn. © 2019 Kingfa SCI. & TECH. CO., LTD.

关键词： Differential scanning calorimetry

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Corrigendum to ‘Polyimide composite separator containing surface-modified hollow mesoporous silica nanospheres for lithium-ion battery application’ [polymer 212 (2021) 123288]

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polymer 2021年 213卷

作者： Tae-Yang Jeong Young Dong Lee Yoojung Ban Juho Lee Hayeong Lee Yong Ku Kwon Department of Polymer Science and Engineering and Program in Environmental and Polymer Engineering Inha University Inha-Ro 100 Incheon 22212 South Korea

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Thermodynamics of Linear Carbon Chains

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Physical Review Letters 2021年第12期126卷 125901-125901页

作者： Nathalia L. Costa Keshav Sharma Yoong Ahm Kim Go Bong Choi Morinobu Endo Newton M. Barbosa Neto Alexandre R. Paschoal Paulo T. Araujo Department of Physics Federal University of Ceara 60455-760 Fortaleza Ceara Brazil Department of Physics and Astronomy University of Alabama Tuscaloosa Alabama 35487 USA 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 Faculty of Engineering Shinshu University 4-17-1 Wakasato Nagano-shi 380-8553 Japan Institute of Natural Sciences Graduate Program in Physics Federal University of Para 66075-110 Belem PA Brazil

Linear carbon chains (LCCs) are one-dimensional materials with unique properties, including high Debye temperatures and restricted selection rules for phonon interactions. Consequently, their Raman C-band frequency’s temperature dependence is a probe to their thermal properties, which are well described within the Debye formalism even at room temperatures. Therefore, with the basis on a semiempirical approach we show how to use the C band to evaluate the LCCs’ internal energy, heat capacity, coefficient of thermal expansion, thermal strain, and Grüneisen parameter, providing universal relations for these quantities in terms of the number of carbons atoms and the temperature.

关键词： Specific heat Temperature Thermal expansion Thermal properties Thermodynamics Thermomechanical effects 1-dimensional systems Lattice models in condensed matter Raman spectroscopy

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Graphene transfer methods: A review

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Nano Research 2021年第11期14卷 3756-3772页

作者： Sami Ullah Xiaoqin Yang Huy Q.Ta Maria Hasan Alicja Bachmatiuk Klaudia Tokarska Barbara Trzebicka Lei Fu Mark H.Rummeli College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou215006China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an710049China Institute for Complex Materials IFW Dresden20 Helmholtz StrasseDresden01069Germany NUTECH School of Applied Sciences&Humanities and Computer Engineering DepartmentNational University of TechnologyIslamabad42000Pakistan Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze41-819Poland College of Chemistry and Molecular Science Wuhan UniversityWuhan430072China Institute of Environmental Technology VŠB-Technical University of Ostrava17.listopadu 15Ostrava70833Czech Republic

Graphene is a material with unique properties that can be exploited in electronics, catalysis, energy, and bio-related fields. Although, for maximal utilization of this material, high-quality graphene is required at both the growth process and after transfer of the graphene film to the application-compatible substrate. Chemical vapor deposition (CVD) is an important method for growing high-quality graphene on non-technological substrates (as, metal substrates, e.g., copper foil). Thus, there are also considerable efforts toward the efficient and non-damaging transfer of quality of graphene on to technologically relevant materials and systems. In this review article, a range of graphene current transfer techniques are reviewed from the standpoint of their impact on contamination control and structural integrity preservation of the as-produced graphene. In addition, their scalability, cost- and time-effectiveness are discussed. We summarize with a perspective on the transfer challenges, alternative options and future developments toward graphene technology.

关键词： high-quality transfer application-compatible substrate graphene technology

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