Article
Polymer Science
Rafael Miguel-Fernandez, Izotz Amundarain, Asier Asueta, Sara Garcia-Fernandez, Sixto Arnaiz, Nora Lardies Miazza, Ernesto Monton, Barbara Rodriguez-Garcia, Elena Bianca-Benchea
Summary: This study developed a method for the chemical recycling of rigid polyurethane foam to obtain high-purity polyols. The research analyzed and characterized the physicochemical properties, chemical structure, and thermal stability of the recycled polyols. The study also investigated the effect of using recycled polyols in the synthesis of rigid polyurethane foam.
Article
Chemistry, Multidisciplinary
Riccardo Donadini, Carlo Boaretti, Luca Scopel, Alessandra Lorenzetti, Michele Modesti
Summary: Methylenedianiline (MDA) is a secondary product of the glycolysis process of polyurethane (PU) scraps, posing challenges for the recycling of PU. This study investigated different deaminating agents (DAs) and found that 2-ethylhexyl glycidyl ether and acetic anhydride were effective in reducing MDA content.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Polymer Science
Izotz Amundarain, Rafael Miguel-Fernandez, Asier Asueta, Sara Garcia-Fernandez, Sixto Arnaiz
Summary: This study investigates the preparation and characteristics of rigid polyurethane foams (RPUFs) synthesized from polyols obtained by glycolysis of post-industrial waste RPUFs. The results show that the partial substitution of commercial polyols with recycled polyols increases the reactivity of the foaming process and improves the compressive properties and modulus values of the foams.
Article
Biochemistry & Molecular Biology
Marcin Borowicz, Marek Isbrandt, Joanna Paciorek-Sadowska
Summary: The research aimed to obtain two new eco-polyols based on waste polylactide (PLA) and tested their effects on rigid polyurethane and polyisocyanurate foams. Analysis showed that partial replacement of petrochemical polyol by eco-polyols resulted in better performance in terms of density, compressive strength, brittleness, water absorption, and aging resistance for both RPU/PIR and PRU foams.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Polymer Science
Xiaohua Gu, Xiaoyao Wang, Xinyu Guo, Siwen Liu, Chunhua Lou, Yan Liu
Summary: This study achieved the high-efficiency degradation and alcoholysis recovery of waste polyurethane foam by utilizing a high-efficiency alkali metal catalyst (CsOH) and two-component mixed alcoholysis agents (glycerol and butanediol) in different proportions. A series of tests were conducted on the properties of the degradation products, and the optimal conditions of alcoholysis were determined. Regenerated polyurethane foam with good thermal stability and meeting national standards was successfully prepared.
Article
Environmental Sciences
Premrudee Kanchanapiya, Noramon Intaranon, Thanapol Tantisattayakul
Summary: This study conducted in Thailand showed that recovering polyol from rigid polyurethane foam waste using domestic crude glycerol as a transesterification agent is economically feasible, with attractive investment returns and payback period. Sensitivity analysis revealed the economic feasibility is most sensitive to the price of the recovered polyol, followed by the amount of waste and prices of machinery, crude glycerol, and stannous octoate.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Materials Science, Characterization & Testing
Irene Izarra, A. M. Borreguero, I Garrido, J. F. Rodriguez, M. Carmona
Summary: The synthesized FPUs showed better hardness and density properties but worse mechanical properties compared to commercial products; FPUs containing PS as filler exhibited higher thermal stability and mechanical resistance than those with SAN filler; density and hardness are affected by filler type and content, with closed cell foams produced at filler contents exceeding 15%.
Article
Materials Science, Multidisciplinary
Tamara Calvo-Correas, Lorena Ugarte, Izaskun Larraza, Cristina Pena-Rodriguez, M. Angeles Corcuera, Arantxa Eceiza
Summary: The study found that adding polyurethane powder at low contents did not significantly alter the final properties of the foam, but instead increased the foam's ability to retain carbon fillers. The compressive properties of the hybrid foams were unaffected by the addition of graphite and graphene. Additionally, the hybrid composites showed selective absorption capacity, maintaining the hydrophobic nature of the foams while providing oil absorption capacity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Biochemistry & Molecular Biology
Akash Gondaliya, Mojgan Nejad
Summary: This study evaluated the suitability of various lignins in replacing 20% of petroleum-based polyol in PU foams, finding that the incorporation of lignin improved the foam's mechanical properties. The study also showed a positive correlation between lignin's hydroxyl content and foam properties, suggesting lignins with low hydroxyl content, high flexibility, and high solubility are better candidates for replacing petroleum-based polyols in flexible PU foams.
Article
Engineering, Environmental
Audrey Magnin, Lisa Entzmann, Eric Pollet, Luc Averous
Summary: The development of green, efficient, and profitable plastic recycling processes is crucial for reducing the expanding plastic pollution and accumulation of microplastics in the environment. Researchers have made significant breakthroughs in the recycling of polyurethanes, particularly in enzymatic degradation of polyether-based PU foam.
Article
Chemistry, Multidisciplinary
Maja Grdadolnik, Blaz Zdovc, Ana Drincic, Ozgun Can Onder, Petra Utrosa, Susana Garcia Ramos, Enrique Dominguez Ramos, David Pahovnik, Ema Zagar
Summary: In this study, microwave-assisted aminolysis with amine reagents containing primary and tertiary amino groups was introduced for the complete degradation of urethane groups in flexible PUFs. This method required a much lower amount of degradation reagent compared to typical solvolysis reactions. The purified, recovered polyols showed similar structural and molar mass characteristics to virgin polyols, making them suitable for high-quality PUF production without modifying the synthesis process. The flexible PUFs made from recovered polyols exhibited comparable mechanical properties to those made from virgin polyols.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Joanna Paciorek-Sadowska, Marcin Borowicz, Ewelina Chmiel, Jacek Lubczak
Summary: Two polyol raw materials were obtained from metasilicic acid (MSA) and poly(lactic acid) (PLA) waste in the research, used for producing rigid polyurethane foams. The foams showed good thermal resistance and compressive strength, with the foam based on the polyol mixture exhibiting better biodegradability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Joungyun Ko, Mohammad Zarei, Seung Goo Lee, Kilwon Cho
Summary: This study developed a chemical approach for efficient recycling of automotive polyurethane foams (PUFs) from post-consumer wastes (PCWs) of automobiles. The PUF scrap was chemically decomposed via glycolysis and used as a reactant in a reaction with alkylene oxide to obtain stable oxyalkylated polyols. By adding recycled polyol to virgin polyol, various automotive PUF-based products were fabricated. The physical characteristics, formability, and VOC contents of the obtained PUFs containing recycled polyol were similar to those of virgin PUFs. The proposed automotive PUF recycling process will promote circular economy and sustainability in the automotive industry.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Polymer Science
Sanita Reinerte, Vilhelmine Jurkjane, Ugis Cabulis, Arturs Viksna
Summary: This study analyzed rigid polyurethane (PU) and polyisocyanurate (PIR) foam samples made from renewable material through pyrolysis gas chromatography mass spectrometry (Py-GC/MS). The main thermal degradation components were found to originate from the decomposition of isocyanate, forming suspected carcinogens and mutagens. The focus was on identifying and evaluating the relative quantities of the produced gaseous products and examining their hazardousness.
Article
Mechanics
Hao Wang, Suchao Xie, Zhejun Feng, Kunkun Jing, Jing Zhang, Hui Zhou
Summary: To enhance the mechanical properties of Nomex honeycomb, in-situ foaming using rigid polyurethane (PU) foam and flexible polyurethane foam (NHRPU, NHFPU, collectively NHPU) was performed. Mechanical properties were evaluated through tests, theoretical and finite element methods. The results showed that NHRPU and NHFPU significantly improved energy absorption, with NHRPU enhancing the absorption performance and NHFPU enhancing the resilience of the honeycomb.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Anu Surendran, Jurgen Pionteck, Nandakumar Kalarikkal, Sabu Thomas
Summary: This study analyzed the effects of organically modified nanoclay on the mechanics, structure, and thermal properties of epoxy resin. The results showed effective adhesion between the nanoclay and the polymer matrix, creating a constrained zone and immobilizing the polymer chains near the fillers. Fine dispersion of the nanoclay was observed, and thermal analysis was conducted on the nanocomposites.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Medicinal
Aliasghar Jarrahpour, Zahra Jowkar, Zahra Haghighijoo, Roghayeh Heiran, Javad Ameri Rad, Veronique Sinou, Florent Rouvier, Christine Latour, Jean Michel Brunel, Namik Ozdemir
Summary: A class of novel spiro-beta-lactam isatin hybrids were synthesized through a [2 + 2] cycloaddition reaction and evaluated for their biological activities. The compounds showed moderate to good activities against P. falciparum K1 strain, but exhibited unsatisfactory antimicrobial activities against Gram-positive and Gram-negative bacteria.
MEDICINAL CHEMISTRY RESEARCH
(2022)
Article
Materials Science, Biomaterials
Alireza Sanei-Dehkordi, Roghayeh Heiran, Mohammad Djaefar Moemenbellah-Fard, Sina Sayah, Mahmoud Osanloo
Summary: The larvicidal effects of essential oils of Satureja khuzestanica and Zataria multiflora, as well as their components, carvacrol, were investigated in this study. The use of nanoliposomal forms yielded better results compared to non-formulated states. These findings suggest that these samples could be potential green larvicides for other mosquito populations.
Article
Chemistry, Multidisciplinary
Elham Riazimontazer, Roghayeh Heiran, Aliasghar Jarrahpour, Ahmad Gholami, Zahra Hashemi, Aboozar Kazemi
Summary: Beta-lactam antibiotics are critical antibacterial agents in modern medicine. In this study, monocyclic beta-lactams with various substituents were synthesized through the Staudinger cycloaddition reaction. The synthesized beta-lactams showed potential antibacterial activity against various strains, including multidrug-resistant pathogens. Molecular docking analysis indicated that compound 4d could serve as a promising lead compound for the treatment of infectious diseases.
Article
Entomology
Alireza Sanei-Dehkordi, Roghayeh Heiran, Ghazaal Roozitalab, Narges Elahi, Mahmoud Osanloo
Summary: In this study, nanoliposomes containing clove and cinnamon essential oils were prepared and their larvicidal effects against Anopheles mosquitoes were investigated. The nanoliposomes showed promising efficacy as natural larvicides, making them a potential candidate for further research.
PSYCHE-A JOURNAL OF ENTOMOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Nataliia Vereshchuk, Marcos Gil-Sepulcre, Abolfazl Ghaderian, Jan Holub, Carolina Gimbert-Surinach, Antoni Llobet
Summary: Today, sustainable and clean energy conversion strategies rely on sunlight and water as sources of protons and electrons, similar to Photosystem II. However, the thermodynamics and complexity of the water oxidation reaction make it difficult to find efficient and stable molecules capable of achieving this task. Ru coordination complexes have been identified as some of the best understood water oxidation catalysts, and their catalytic performance and key factors influencing their performance have been extensively studied.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Energy & Fuels
Abolfazi Ghaderian, Naveen Harindu Hemasiri, Shahzada Ahmad, Samrana Kazim
Summary: The 3D-halide perovskite-based solar cells have shown impressive power conversion efficiency. This study explores the use of a common salt, tetra-n-butyl ammonium hexafluorophosphate (TBAPF), as a passivating agent to improve the efficiency and stability of the perovskite solar cells.
Article
Chemistry, Multidisciplinary
Rekha Rose Koshy, Arunima Reghunadhan, Siji K. Mary, Jijo Thomas Koshy, Hema Santhakumar, Ramapurath. S. Jayasree, Laly A. Pothen, Sabu Thomas
Summary: Sustainable and renewable sources for nanomaterial synthesis are explored in this study. Vermicompost-derived materials are found to have versatile applications. Carbon quantum dots (CDs) and hydrochar were successfully synthesized from vermicompost, with the CDs exhibiting broad emission spectrum and excitation dependent emission phenomenon. The CDs also showed high cellular uptake and intracellular localization, making them promising for various applications. The hydrochar produced from vermicompost was effective in adsorbing methylene blue dye from water. Overall, vermicompost is suggested as a promising alternative for nanomaterial synthesis.
Article
Chemistry, Physical
Rashid Sulthan, Arunima Reghunadhan, Sreedha Sambhudevan
Summary: Chitin is a valuable natural source of mucopolysaccharides that has applications in various biomedical fields. The primary source of chitin mass production is the waste biomass from the fish industry. Recent advancements in the utilization of biowastes offer a promising step towards green chemistry and sustainable development. Various techniques have been adopted for efficient extraction of chitin, with ionic liquids and Deep Eutectic Solvents being the more environmentally friendly options. The extracted chitin's purity, crystallinity, and yield vary depending on the reagents, methods, and biomass source used. Chitin derivatives, chitosan, chitin hydrogels, and chitin nanofibers/nanowhiskers have been studied and found suitable for biomedical and non-biomedical applications. This review compares the dissolution and extraction strategies of chitin using Ionic Liquids and Deep Eutectic Solvents.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Polymer Science
Alireza Valizadeh, Mehrnaz Hosseinzadeh, Roghayeh Heiran, Shekoufeh Hatami, Ali Hosseinipour, Mahmoud Osanloo
Summary: This study investigated the anticancer activity of Lavandula angustifolia essential oil and alginate nanoparticles containing L. angustifolia essential oil. The essential oil components were characterized using GC-MS, and the nanoparticle size was analyzed by DLS. The cytotoxicity of the essential oil and nanoparticles on melanoma and breast cancer cell lines was evaluated, and gene expression was assessed using RT-qPCR. Alginate nanoparticles containing L. angustifolia essential oil showed significant anticancer activity and affected apoptosis regulator genes, making them a potential candidate for in vivo studies.
Article
Polymer Science
Hamidreza Rahmani, Ali Ghanbariasad, Mohammad Hassan Meshkibaf, Alireza Molazade, Roghayeh Heiran, Mojdeh Safari, Mahmoud Osanloo
Summary: Melanoma is a deadly form of skin cancer, and due to the drawbacks of chemotherapeutic drugs, there is a focus on developing new herbal drugs. This study identified the chemical composition of Rosmarinus officinalis essential oil and prepared chitosan nanoparticles containing the oil along with alpha-pinene. The efficacy of the nanoparticles containing alpha-pinene was found to be more potent than other formulations, and it was confirmed that the effect on cell viability occurred through the apoptosis pathway.
Review
Materials Science, Multidisciplinary
Abolfazl Ghaderian, Roghayeh Heiran, Samrana Kazim, Shahzada Ahmad
Summary: The development of sustainable and cost-effective energy resources is a challenging task. Utilizing solar energy and employing polymers as charge transporting layers can improve the reliability and performance of solar cells, advancing their commercial viability.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Food Science & Technology
Rekha Rose Koshy, Arunima Reghunadhan, Siji K. Mary, Prasanth S. Pillai, Seno Joseph, Laly A. Pothen
Summary: This study focuses on the fabrication and properties of pH sensitive films using soy protein isolate, chitin nano whiskers, and flower extract. The addition of chitin nanowhiskers and Clitoria ternatea flower extract to soy protein isolate resulted in the preparation of biodegradable films with pH sensitivity, which showed visible color changes in acidic and basic medium. These films can be used to monitor the freshness of food materials.
CURRENT RESEARCH IN FOOD SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Rekha Rose Koshy, Arunima Reghunadhan, Siji K. Mary, Kiran Thomas, K. R. Ajish, Sabu Thomas, Laly A. Pothen
Summary: pH-sensitive intelligent film is an innovative packaging material that can visually detect changes in ammonia and acidity. The study found that films incorporated with anthocyanin showed distinguishable color changes in different pH buffers and demonstrated good sensitivity for ammonia detection. This food-grade material can be used to detect spoilage of meat and seafood, as well as monitor ammonia concentration in fish farming ponds.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Polymer Science
Aswathi Madathinal Kunjappan, Arunima Reghunadhan, Ajitha A. Ramachandran, Moothetty Padmanabhan, Lovely Mathew, Sabu Thomas
Summary: The current research provides clear evidence of the reinforcement effect of multi-walled CNTs in the PTT/PE blended system. The combination of PE with PTT decreases the brittleness of PTT and increases the impact and tensile strength of the blend nanocomposites. Adding 1 wt % MWCNT increases the impact strength by 254%. The concentration of 2 wt % MWCNT shows the most favorable effects in terms of enhancing tensile strength, Young's modulus, and elongation at break.
POLYMER-PLASTICS TECHNOLOGY AND MATERIALS
(2022)