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Mohamed DFMS, Tarafdar A, Lee SY, Oh HB, Kwon JH. Assessment of biodegradation and toxicity of alternative plasticizer di(2-ethylhexyl) terephthalate: Impacts on microbial biofilms, metabolism, and reactive oxygen species-mediated stress response. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 355:124217. [PMID: 38797346 DOI: 10.1016/j.envpol.2024.124217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 05/04/2024] [Accepted: 05/23/2024] [Indexed: 05/29/2024]
Abstract
Although di(2-ethylhexyl) terephthalate (DOTP) is being widely adopted as a non-phthalate plasticizer, existing research primarily focuses on human and rat toxicity. This leaves a significant gap in our understanding of their impact on microbial communities. This study assessed the biodegradation and toxicity of DOTP on microbes, focusing on its impact on biofilms and microbial metabolism using Rhodococcus ruber as a representative bacterial strain. DOTP is commonly found in mass fractions between 0.6 and 20% v/v in various soft plastic products. This study used polyvinyl chloride films (PVC) with varying DOTP concentrations (range 1-10% v/v) as a surface for analysis of biofilm growth. Cell viability and bacterial stress responses were tested using LIVE/DEAD™ BacLight™ Bacterial Viability Kit and by the detection of reactive oxygen species using CellROX™ Green Reagent, respectively. An increase in the volume of dead cells (in the plastisphere biofilm) was observed with increasing DOTP concentrations in experiments using PVC films, indicating the potential negative impact of DOTP on microbial communities. Even at a relatively low concentration of DOTP (1%), signs of stress in the microbes were noticed, while concentrations above 5% compromised their ability to survive. This research provides a new understanding of the environmental impacts of alternative plasticizers, prompting the need for additional research into their wider effects on both the environment and human health.
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Affiliation(s)
- Dana Fahad M S Mohamed
- Division of Environmental Science and Ecological Engineering, Korea University, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Abhrajyoti Tarafdar
- Division of Environmental Science and Ecological Engineering, Korea University, Seongbuk-gu, Seoul, 02841, Republic of Korea; School of Food Science and Environmental Health, Technological University Dublin, City Campus, Grangegorman, Dublin, D07ADY7, Ireland
| | - So Yeon Lee
- Department of Chemistry, Sogang University, Seoul, 04107, Republic of Korea
| | - Han Bin Oh
- Department of Chemistry, Sogang University, Seoul, 04107, Republic of Korea
| | - Jung-Hwan Kwon
- Division of Environmental Science and Ecological Engineering, Korea University, Seongbuk-gu, Seoul, 02841, Republic of Korea.
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2
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You Z, Yu M, Fu R, Nie X, Chen J. Synthesis and Properties of a Novel Levulinic Acid-Based Environmental Auxiliary Plasticizer for Poly(vinyl chloride). Polymers (Basel) 2024; 16:361. [PMID: 38337249 DOI: 10.3390/polym16030361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/26/2023] [Accepted: 12/29/2023] [Indexed: 02/12/2024] Open
Abstract
Herein, a bio-based plasticizer ketalized tung oil butyl levulinate (KTBL) was developed using methyl eleostearate, a derivative of tung oil, and butyl levulinate. KTBL can be used as an auxiliary plasticizer to partially replace traditional plasticizer. The plasticizer has a ketone structure, an ester base, and a long linear chain. It was mixed with dioctyl phthalate (DOP), and the effect of the plasticizer KTBL as an auxiliary plasticizer on the plasticization of poly(vinyl chloride) (PVC) was studied. Their compatibility and plasticizing effect were evaluated using dynamic-mechanical thermal analysis (DMA), mechanical property analysis, and thermogravimetric analysis (TGA). The results demonstrate that when the KTBL to DOP ratio is 1:1, the blended sample with KTBL exhibits superior mechanical performance compared to pure DOP, resulting in an increased elongation at break from 377.47% to 410.92%. Moreover, with the increase in KTBL content, the durability is also significantly improved. These findings suggest that KTBL can serve as an effective auxiliary plasticizer for PVC, thereby reducing the reliance on DOP.
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Affiliation(s)
- Zeyu You
- Key Laboratory of Biomass Energy and Material, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Min Yu
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Renli Fu
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Xiaoan Nie
- Key Laboratory of Biomass Energy and Material, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China
| | - Jie Chen
- Key Laboratory of Biomass Energy and Material, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China
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3
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Kim DY, Sochichiu S, Kwon JH. Effects of time, temperature, and sebum layer on migration rate of plasticizers in polyvinyl chloride products. CHEMOSPHERE 2022; 308:136478. [PMID: 36122749 DOI: 10.1016/j.chemosphere.2022.136478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 09/05/2022] [Accepted: 09/14/2022] [Indexed: 06/15/2023]
Abstract
Large amounts of plasticizers, such as di(2-ethylhexyl) phthalate (DEHP) and dioctyl terephthalate (DOTP), are added to various polyvinyl chloride (PVC) products. To assess the human exposure to these plasticizers on using PVC products, it is important to know their migration rate. However, conventional migration tests conducted at a fixed time and temperature are often insufficient for determining possible variations in migration rates with respect to time, temperature, and sebum layer. In this study, the migration rates of DEHP and DOTP from five PVC products were measured using a polydimethylsiloxane (PDMS) sampler at different times and temperatures, in the presence and absence of artificial sebum. Although the migrated mass of the plasticizers increased over time, the average migration rate decreased. The average migration rates increased with increasing temperature and in the presence of an artificial sebum layer between the product and the PDMS sampler. When the artificial sebum layer was added, the average migration rate increased considerably by a factor of 1.5-14, suggesting that sebum should be considered to avoid the underestimation of dermal exposure to highly hydrophobic plasticizers, such as DEHP and DOTP. Based on the measured values, a conceptual analysis was conducted to quantitatively assess the difference in the migration rate of plasticizers caused by the difference between the time set for the migration test and the exposure time when the product is used. To reduce uncertainties and the potential underestimation of dermal exposure, an appropriate time for the experiment should be set to simulate the exposure scenario of a given product.
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Affiliation(s)
- Du Yung Kim
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Stefana Sochichiu
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Jung-Hwan Kwon
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
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4
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Deng T, Li S, Jia P, Yao N, Ding H, Xu L, Zhang Y, Yang X, Li M. Self-Plasticized PVC Prepared by Introducing Fatty Acid to the PVC with Triglycidyl Isocyanurate as an Intermediate Bridge. ACS OMEGA 2022; 7:35694-35704. [PMID: 36249389 PMCID: PMC9558238 DOI: 10.1021/acsomega.2c03655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
The phthalate-free self-plasticization of poly(vinyl chloride) (PVC) conforms to the concept of green chemistry. In this work, phthalate-free, biocontaining, self-plasticized PVC with nonmigration (4-an-TG-X-PVC; X = R, P, or O) was prepared by covalent attachment of ricinoleic acid, palmitic acid, and oleic acid, respectively, to the PVC matrix with 4-aminothiophenol and triglycidyl isocyanurate (TGIC) as intermediate bridges. 4-Aminothiophenol and TGIC acted as the nucleophilic reagent and the thermally stable substance, respectively. The 4-an-TG-X-PVC was observed by diverse characterization methods. Specifically, Fourier transform infrared spectra, 1H nuclear magnetic resonance, gel permeation chromatography, and migration stability tests proved the successful synthesis of 4-an-TG-X-PVC. Compared to the neat PVC, the mechanical property of 4-an-TG-X-PVC is better. The glass transition temperature (T g) of PVC is 81.24 °C, while that of 4-an-TG-X-PVC decreased to 41.88, 31.49, and 46.91 °C. The 4-an-TG-X-PVC showed higher elongation at break and lower tensile strength than neat PVC. Simultaneously, the thermal property of 4-an-TG-X-PVC got a boost. Thermogravimetry-infrared and thermogravimetry-mass spectrometry showed that 4-an-TG-X-PVC released less HCl than neat PVC in a thermal environment. Discoloration experiments demonstrated that 4-an-TG-P-PVC had better heat stabilization and better color than 4-an-TG-O-PVC and 4-an-TG-R-PVC. This work provides a viable solution to the dependence on phthalates, reduced human health and ecological risks, and endowed PVC with improved thermal stability and nonmigration performance.
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5
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Bouattour Y, Sautou V, Hmede R, El Ouadhi Y, Gouot D, Chennell P, Lapusta Y, Chapelle F, Lemaire JJ. A Minireview on Brain Models Simulating Geometrical, Physical, and Biochemical Properties of the Human Brain. Front Bioeng Biotechnol 2022; 10:818201. [PMID: 35419353 PMCID: PMC8996142 DOI: 10.3389/fbioe.2022.818201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 03/08/2022] [Indexed: 11/13/2022] Open
Abstract
There is a growing body of evidences that brain surrogates will be of great interest for researchers and physicians in the medical field. They are currently mainly used for education and training purposes or to verify the appropriate functionality of medical devices. Depending on the purpose, a variety of materials have been used with specific and accurate mechanical and biophysical properties, More recently they have been used to assess the biocompatibility of implantable devices, but they are still not validated to study the migration of leaching components from devices. This minireview shows the large diversity of approaches and uses of brain phantoms, which converge punctually. All these phantoms are complementary to numeric models, which benefit, reciprocally, of their respective advances. It also suggests avenues of research for the analysis of leaching components from implantable devices.
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Affiliation(s)
- Yassine Bouattour
- Université Clermont Auvergne, CHU Clermont Ferrand, Clermont Auvergne INP, CNRS, ICCF, F-63000, Clermont-Ferrand, France
- *Correspondence: Yassine Bouattour, ; Jean-Jacques Lemaire,
| | - Valérie Sautou
- Université Clermont Auvergne, CHU Clermont Ferrand, Clermont Auvergne INP, CNRS, ICCF, F-63000, Clermont-Ferrand, France
| | - Rodayna Hmede
- Universite Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000, Clermont-Ferrand, France
| | - Youssef El Ouadhi
- Universite Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000, Clermont-Ferrand, France
- Service de Neurochirurgie, CHU Clermont Ferrand, F-63000, Clermont-Ferrand, France
| | - Dimitri Gouot
- Universite Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000, Clermont-Ferrand, France
| | - Philip Chennell
- Université Clermont Auvergne, CHU Clermont Ferrand, Clermont Auvergne INP, CNRS, ICCF, F-63000, Clermont-Ferrand, France
| | - Yuri Lapusta
- Universite Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000, Clermont-Ferrand, France
| | - Frédéric Chapelle
- Universite Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000, Clermont-Ferrand, France
| | - Jean-Jacques Lemaire
- Universite Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000, Clermont-Ferrand, France
- Service de Neurochirurgie, CHU Clermont Ferrand, F-63000, Clermont-Ferrand, France
- *Correspondence: Yassine Bouattour, ; Jean-Jacques Lemaire,
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6
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Otter R, Langsch A, Harmon P, Boito SC, Mervart J, Grass M, Sarginson NJ. Comment on Bernard et al. Association between Urinary Metabolites and the Exposure of Intensive Care Newborns to Plasticizers of Medical Devices Used for Their Care Management. Metabolites 2021, 11, 252. Metabolites 2021; 11:metabo11090596. [PMID: 34564412 PMCID: PMC8466621 DOI: 10.3390/metabo11090596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 07/09/2021] [Accepted: 08/18/2021] [Indexed: 11/16/2022] Open
Affiliation(s)
- Rainer Otter
- BASF SE, 67056 Ludwigshafen, Germany;
- Correspondence:
| | | | | | | | - Jan Mervart
- DEZA, a.s., 757 01 Valašské Meziříčí, Czech Republic;
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Bernard L, Bouattour Y, Masse M, Boeuf B, Decaudin B, Genay S, Lambert C, Moreau E, Pereira B, Pinguet J, Richard D, Sautou V. Reply to Otter et al. Comment on "Bernard et al. Association between Urinary Metabolites and the Exposure of Intensive Care Newborns to Plasticizers of Medical Devices Used for Their Care Management. Metabolites 2021, 11, 252". Metabolites 2021; 11:metabo11090598. [PMID: 34564413 PMCID: PMC8465745 DOI: 10.3390/metabo11090598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 07/29/2021] [Accepted: 08/18/2021] [Indexed: 11/16/2022] Open
Affiliation(s)
- Lise Bernard
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, CHU Clermont Ferrand, ICCF, F-63000 Clermont-Ferrand, France; (L.B.); (Y.B.)
| | - Yassine Bouattour
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, CHU Clermont Ferrand, ICCF, F-63000 Clermont-Ferrand, France; (L.B.); (Y.B.)
| | - Morgane Masse
- Université de Lille, CHU Lille, ULR 7365 GRITA, F-59000 Lille, France; (M.M.); (B.D.); (S.G.)
| | - Benoît Boeuf
- CHU Clermont-Ferrand, Service Réanimation Pédiatrique et Périnatalogie, F-63000 Clermont-Ferrand, France;
| | - Bertrand Decaudin
- Université de Lille, CHU Lille, ULR 7365 GRITA, F-59000 Lille, France; (M.M.); (B.D.); (S.G.)
| | - Stéphanie Genay
- Université de Lille, CHU Lille, ULR 7365 GRITA, F-59000 Lille, France; (M.M.); (B.D.); (S.G.)
| | - Céline Lambert
- CHU Clermont-Ferrand, Direction de la Recherche Clinique et de l’Innovation, F-63000 Clermont-Ferrand, France; (C.L.); (B.P.)
| | - Emmanuel Moreau
- Université Clermont Auvergne, INSERM U1240, IMOST, F-63000 Clermont-Ferrand, France;
| | - Bruno Pereira
- CHU Clermont-Ferrand, Direction de la Recherche Clinique et de l’Innovation, F-63000 Clermont-Ferrand, France; (C.L.); (B.P.)
| | - Jérémy Pinguet
- Université Clermont-Auvergne, Unité INSERM 1107 Neuro-Dol, CHU Clermont-Ferrand, F-63000 Clermont-Ferrand, France; (J.P.); (D.R.)
| | - Damien Richard
- Université Clermont-Auvergne, Unité INSERM 1107 Neuro-Dol, CHU Clermont-Ferrand, F-63000 Clermont-Ferrand, France; (J.P.); (D.R.)
| | - Valérie Sautou
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, CHU Clermont Ferrand, ICCF, F-63000 Clermont-Ferrand, France; (L.B.); (Y.B.)
- Correspondence:
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8
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Association between Urinary Metabolites and the Exposure of Intensive Care Newborns to Plasticizers of Medical Devices Used for Their Care Management. Metabolites 2021; 11:metabo11040252. [PMID: 33921860 PMCID: PMC8073472 DOI: 10.3390/metabo11040252] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 11/24/2022] Open
Abstract
Care management of newborns in the neonatal intensive care unit (NICU) requires numerous PVC (PolyVinyl Chloride) medical devices (MD) containing plasticizers that can migrate and contaminate the patient. We measured the magnitude of neonates’ exposure to plasticizers (di-ethylhexylphthalate (DEHP) and alternatives) in relation to urinary concentrations of their metabolites. Plasticizers’ exposure was evaluated (1) by calculating the amounts of plasticizers prone to be released from each MD used for care management, and (2) by measuring the patients’ urinary levels of each plasticizers’ metabolites. 104 neonates were enrolled. They were exposed to di-isononylphthalate (DINP), especially via transfusion and infusion MD, and to DEHP via ECMO (Extra Corporeal Membrane Oxygenation) and respiratory assistance MD. Mean exposure doses exceeded the derived no-effect level of DINP and DEHP by a 10-fold and a 1000-fold factor. No PVC MD were plasticized with di-isononylcyclohexane-1,2-dicarboxylate (DINCH). High urinary concentrations of DEHP metabolites were directly correlated with DEHP exposure through ECMO MD. Urinary concentrations of DINP metabolites in transfused patients were also high. DINCH metabolites were found in urine, suggesting another route of exposure. Neonates in NICU are considerably exposed to plasticizers, with magnitudes varying with the type of MD used. The high exposure to DEHP and DINP leads to a risk of their metabolites’ toxicity.
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9
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Compact NMR Spectroscopy for Low-Cost Identification and Quantification of PVC Plasticizers. Molecules 2021; 26:molecules26051221. [PMID: 33668752 PMCID: PMC7956471 DOI: 10.3390/molecules26051221] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 02/21/2021] [Accepted: 02/22/2021] [Indexed: 11/17/2022] Open
Abstract
Polyvinyl chloride (PVC), one of the most important polymer materials nowadays, has a large variety of formulations through the addition of various plasticizers to meet the property requirements of the different fields of applications. Routine analytical methods able to identify plasticizers and quantify their amount inside a PVC product with a high analysis throughput would promote an improved understanding of their impact on the macroscopic properties and the possible health and environmental risks associated with plasticizer leaching. In this context, a new approach to identify and quantify plasticizers employed in PVC commodities using low-field NMR spectroscopy and an appropriate non-deuterated solvent is introduced. The proposed method allows a low-cost, fast, and simple identification of the different plasticizers, even in the presence of a strong solvent signal. Plasticizer concentrations below 2 mg mL-1 in solution corresponding to 3 wt% in a PVC product can be quantified in just 1 min. The reliability of the proposed method is tested by comparison with results obtained under the same experimental conditions but using deuterated solvents. Additionally, the type and content of plasticizer in plasticized PVC samples were determined following an extraction procedure. Furthermore, possible ways to further decrease the quantification limit are discussed.
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10
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Yuan H, Hao Q, Su R, Qi W, He Z. Migration of phthalates from polyvinyl chloride film to fatty food simulants: experimental studies and model application. J Verbrauch Lebensm 2019. [DOI: 10.1007/s00003-019-01249-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Kumar S. Recent Developments of Biobased Plasticizers and Their Effect on Mechanical and Thermal Properties of Poly(vinyl chloride): A Review. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02080] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Sudheer Kumar
- School for Advanced Research in Polymers (SARP), Laboratory for Advanced Research in Polymeric Materials (LARPM), Central Institute of Plastics Engineering & Technology (CIPET: IPT), B/25, CNI Complex, Patia, Bhubaneswar, Odisha 751024, India
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12
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Marceneiro S, Alves R, Lobo I, Dias I, de Pinho E, Dias AMA, Rasteiro MG, C. de Sousa H. Effects of Poly(vinyl chloride) Morphological Properties on the Rheology/Aging of Plastisols and on the Thermal/Leaching Properties of Films Formulated Using Nonconventional Plasticizers. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b03097] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sofia Marceneiro
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Rafael Alves
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Irene Lobo
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Isabel Dias
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Elizabete de Pinho
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Ana M. A. Dias
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - M. Graça Rasteiro
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Hermínio C. de Sousa
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
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