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Artigos de revistas sobre o tema "Biosourced polymer"

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Autor: Grafiati

Publicado: 25 de maio de 2024

Última modificação: 22 de junho de 2024

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1

Pizzi, Antonio, Antonios N. Papadopoulos e Franco Policardi. "Wood Composites and Their Polymer Binders". Polymers 12, n.º 5 (13 de maio de 2020): 1115. http://dx.doi.org/10.3390/polym12051115.

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This review presents first, rather succinctly, what are the important points to look out for when preparing good wood composites, the main types of wood composites manufactured industrially, and the mainly oil-derived wood composite adhesives and binders that dominate and have been dominating this industry. Also briefly described are the most characteristic biosourced, renewable-derived adhesives that are actively researched as substitutes. For all these adhesives, synthetic and biosourced, the reviews expose the considerable progresses which have occurred relatively recently, with a host of new approaches and ideas having been proposed and tested, some even implemented, but with even many more already appearing on the horizon.

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2

Matei Ghimbeu, Camélia, e Valeriy A. Luchnikov. "Hierarchical porous nitrogen-doped carbon beads derived from biosourced chitosan polymer". Microporous and Mesoporous Materials 263 (junho de 2018): 42–52. http://dx.doi.org/10.1016/j.micromeso.2017.12.001.

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3

Guessasma, Sofiane, Sofiane Belhabib, David Bassir, Hedi Nouri e Samuel Gomes. "On the Mechanical Behaviour of Biosourced Cellular Polymer Manufactured Using Fused Deposition Modelling". Polymers 12, n.º 11 (11 de novembro de 2020): 2651. http://dx.doi.org/10.3390/polym12112651.

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The aim of this study is to investigate on the compression performance of cellular Polylactic Acid (PLA) manufacturing while using Fused Deposition Modelling. Computer Aided Design (CAD) models of cellular structures are designed using the sequential addition of spherical voids with porosity content varying from 10% to 60%. The three-dimensional (3D) microstructures of cellular PLA are characterised using X-ray micro-tomography to retrieve the correlation between the process-induced defects and the cellular geometrical properties. Mechanical testing is performed under severe compression conditions allowing for the reduction in sample height up to 80%. Finite element computation that is based on real microstructures is used in order to evaluate the effect of defects on the compression performance. The results show a significant drop of the process-induced defects thanks to the use of small layer thickness. Both mechanical anisotropy and performance loss are reduced due to vanishing process-induced defects more significantly when the amount of intended porosities is large. The compression behaviour of 3D printed PLA cellular structures is then found to be only guided by the amount and distribution of the intended porosity.

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4

Schlienger, Sébastien, Anne-Laure Graff, Alain Celzard e Julien Parmentier. "Direct synthesis of ordered mesoporous polymer and carbon materials by a biosourced precursor". Green Chem. 14, n.º 2 (2012): 313–16. http://dx.doi.org/10.1039/c2gc16160e.

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5

Raytchev, Pascal Dimitrov, Céline Besset, Etienne Fleury, Jean-Pierre Pascault, Julien Bernard e Eric Drockenmuller. "1,4:3,6-Dianhydrohexitols: Original platform for the design of biobased polymers using robust, efficient, and orthogonal chemistry". Pure and Applied Chemistry 85, n.º 3 (15 de agosto de 2012): 511–20. http://dx.doi.org/10.1351/pac-con-12-03-11.

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1,4:3,6-Dianhydrohexitols (DAHs) are nontoxic and sustainable diols that have been extensively applied as monomers for the preparation of polymer materials by step-growth polymerization processes. The presence of two reactive alcohol groups was exploited to design a library of symmetric and asymmetric stereocontrolled alkyne- and/or azide-functionalized AA/BB and AB monomers suitable for thermal or copper(I)-catalyzed azide-alkyne cycloaddition (TAAC and CuAAC). Step-growth polymerization of these monomers yielded a series of linear polytriazoles as well as partially biosourced networks using a combination of AB + A2B2 derivatives. Characterization of the resulting materials allowed for the establishment of a thorough structure–property relationship emphasizing the impact of monomer stereochemistry and cycloaddition regioselectivity on materials properties.

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6

Vázquez-Fletes, Roberto C., Vahid Sadeghi, Rubén González-Núñez e Denis Rodrigue. "Effect of Surface Modification on the Properties of Buckwheat Husk—High-Density Polyethylene Biocomposites". Journal of Composites Science 7, n.º 10 (12 de outubro de 2023): 429. http://dx.doi.org/10.3390/jcs7100429.

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This study focuses on the production and characterization of biocomposites based on a thermoplastic polymer (high-density polyethylene, HDPE) and a biosourced filler (buckwheat husk, BHS) to develop more sustainable composites. Compounding was performed via twin-screw extrusion with three different types of BHS. In the first series, untreated BHS was directly mixed with the polymer matrix, while the second series used mercerized BHS and the third series used pretreated BHS with a coupling agent (polyethylene grafted with maleic anhydride, MAPE) in solution. The samples were prepared at different concentrations (10, 20, 30, 40 and 50 wt.% of BHS) to compare with the neat matrix (0%). All the samples were finally produced by compression molding and then cut to get the specimens for characterization. The latter included morphological (scanning electron microscopy), physical (density and hardness) and mechanical (tension, flexural and impact strength) properties. Based on the results obtained, it was observed that most of the mechanical and physical properties were improved, especially when the BHS was pretreated in solution before its introduction into the polymer matrix. The results showed that 30 wt.% of BHS in HDPE was the optimum for most of the properties investigated.

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7

Rani, M. S. A., N. H. Hassan, A. Ahmad, H. Kaddami e N. S. Mohamed. "Investigation of biosourced carboxymethyl cellulose-ionic liquid polymer electrolytes for potential application in electrochemical devices". Ionics 22, n.º 10 (17 de maio de 2016): 1855–64. http://dx.doi.org/10.1007/s11581-016-1728-8.

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8

Fournier, Pauline, Caroline R. Szczepanski, René-Paul Godeau e Guilhem Godeau. "Chitosan Extraction from Goliathus orientalis Moser, 1909: Characterization and Comparison with Commercially Available Chitosan". Biomimetics 5, n.º 2 (26 de abril de 2020): 15. http://dx.doi.org/10.3390/biomimetics5020015.

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Chitosan is a polymer obtained by deacetylation of chitin, and chitin is one of the major components of the arthropod cuticle. Chitin and chitosan are both polysaccharides and are considered to be an interesting class of biosourced materials. This is evident as chitosan has already demonstrated utility in various applications in both industrial and biomedical domains. In the present work, we study the possibility to extract chitin and prepare chitosan from the Goliath beetle Goliathus orientalis Moser. The presented work includes description of this process and observation of the macroscopic and microscopic variations that occur in the specimen during the treatment. The prepared chitosan is characterized and compared with commercially available chitosan using infrared and thermogravimetric analysis. The deacetylation degree of prepared chitosan is also evaluated and compared with commercially available shrimp chitosan.

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9

Saadaoui, Asma, Corinne Sanglar, Raouf Medimagh, Anne Bonhomme, Robert Baudot, Saber Chatti, Sylvain Marque, Damien Prim, Mongia Saïd Zina e Herve Casabianca. "New biosourced chiral molecularly imprinted polymer: Synthesis, characterization, and evaluation of the recognition capacity of methyltestosterone". Journal of Molecular Recognition 30, n.º 4 (25 de novembro de 2016): e2594. http://dx.doi.org/10.1002/jmr.2594.

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10

Galliano, Simone, Federico Bella, Matteo Bonomo, Guido Viscardi, Claudio Gerbaldi, Gerrit Boschloo e Claudia Barolo. "Hydrogel Electrolytes Based on Xanthan Gum: Green Route towards Stable Dye-Sensitized Solar Cells". Nanomaterials 10, n.º 8 (12 de agosto de 2020): 1585. http://dx.doi.org/10.3390/nano10081585.

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The investigation of innovative electrolytes based on nontoxic and nonflammable solvents is an up-to-date, intriguing challenge to push forward the environmental sustainability of dye-sensitized solar cells (DSSCs). Water is one of the best choices, thus 100% aqueous electrolytes are proposed in this work, which are gelled with xanthan gum. This well-known biosourced polymer matrix is able to form stable and easily processable hydrogel electrolytes based on the iodide/triiodide redox couple. An experimental strategy, also supported by the multivariate chemometric approach, is used here to study the main factors influencing DSSCs efficiency and stability, leading to an optimized system able to improve its efficiency by 20% even after a 1200 h aging test, and reaching an overall performance superior to 2.7%. In-depth photoelectrochemical investigation demonstrates that DSSCs performance based on hydrogel electrolytes depends on many factors (e.g., dipping conditions, redox mediator concentrations, etc.), that must be carefully quantified and correlated in order to optimize these hydrogels. Photovoltaic performances are also extremely reproducible and stable in an open cell filled in air atmosphere, noticeably without any vacuum treatments.

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11

Fazli, Ali, e Denis Rodrigue. "Biosourced Poly(lactic acid)/polyamide-11 Blends: Effect of an Elastomer on the Morphology and Mechanical Properties". Molecules 27, n.º 20 (12 de outubro de 2022): 6819. http://dx.doi.org/10.3390/molecules27206819.

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Fully biobased polylactide (PLA)/polyamide-11 (PA11) blends were prepared by melt mixing with an elastomer intermediate phase to address the low elasticity and brittleness of PLA blends. The incorporation of a biobased elastomer made of poly(butylene adipate-co-terephthalate) (PBAT) and polyethylene oxide (PEO) copolymers was found to change the rigid interface between PLA and PA11 into a much more elastic/deformable one as well as promote interfacial compatibility. The interfacial tension of the polymer pairs and spreading coefficients revealed a high tendency of PEO to spread at the PLA/PA11 interface, resulting in a complete wetting regime (interfacial tension of 0.56 mN/m). A fully percolated rubbery phase (PEO) layer at the PLA/PA11 interface with enhanced interfacial interactions and PLA chain mobility contributed to a better distribution of the stress around the dispersed phase, leading to shear yielding of the matrix. The results also show that both the morphological modification and improved compatibility upon PEO addition (up to 20 wt %) contributed to the improved elongation at break (up to 104%) and impact strength (up to 292%) of the ternary PLA/PA11/PEO blends to obtain a super-tough multiphase system.

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12

Espadas-Aldana, Gabriela, Priscila Guaygua-Amaguaña, Claire Vialle, Jean-Pierre Belaud, Philippe Evon e Caroline Sablayrolles. "Life Cycle Assessment of Olive Pomace as a Reinforcement in Polypropylene and Polyethylene Biocomposite Materials: A New Perspective for the Valorization of This Agricultural By-Product". Coatings 11, n.º 5 (29 de abril de 2021): 525. http://dx.doi.org/10.3390/coatings11050525.

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The main environmental impact of olive oil production is the disposal of residues such as pomace and water vegetation. During the olive oil extraction process, the olive stone is milled and discharged within the olive pomace. However, olive stone flour can be valorized as filler for polymeric composites. A life cycle assessment of the olive pomace valorization was carried out by focusing on the manufacturing process of a biocomposite made of two different thermoplastic matrices, i.e., polyethylene and polypropylene. The functional unit is the production of 1 m2 of a lath made of an olive pomace-based biocomposite. The analysis was carried out with the SimaPro PhD 9.1.1.1 software, and the database used for the modeling was Ecoinvent 3.6. The obtained results reveal that the hotspot of the whole process is the twin-screw compounding of the olive stone fraction, with the polymeric matrix and coupling agent, and that human health is the most affected damage category. It represents 89% for both scenarios studied: olive stone fraction/polypropylene (OSF/PP) and olive stone fraction/polyethylene (OSF/PE). Further research directions include the use of biosourced polymer matrices, which could reduce the impact of olive pomace-based composite manufacturing.

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13

Radjagobalou, Robbie, Jean-François Blanco, Luca Petrizza, Mickael Le Bechec, Odile Dechy-Cabaret, Sylvie Lacombe, Maud Save e Karine Loubiere. "Efficient Photooxygenation Process of Biosourced α-Terpinene by Combining Controlled LED-Driven Flow Photochemistry and Rose Bengal-Anchored Polymer Colloids". ACS Sustainable Chemistry & Engineering 8, n.º 50 (7 de dezembro de 2020): 18568–76. http://dx.doi.org/10.1021/acssuschemeng.0c06627.

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14

Vega, Sohn, Bruun, Olsen e Birkved. "Maximizing Environmental Impact Savings Potential Through Innovative Biorefinery Alternatives: An Application of the TM-LCA Framework for Regional Scale Impact Assessment". Sustainability 11, n.º 14 (13 de julho de 2019): 3836. http://dx.doi.org/10.3390/su11143836.

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In order to compare the maximum potential environmental impact savings that may result from the implementation of innovative biorefinery alternatives at a regional scale, the Territorial Metabolism-Life Cycle Assessment (TM-LCA) framework is implemented. With the goal of examining environmental impacts arising from technology-to-region (territory) compatibility, the framework is applied to two biorefinery alternatives, treating a mixture of cow manure and grape marc. The biorefineries produce either biogas alone or biogas and polyhydroxyalkanoates (PHA), a naturally occurring polymer. The production of PHA substitutes either polyethylene terephthalate (PET) or biosourced polylactide (PLA) production. The assessment is performed for two regions, one in Southern France and the other in Oregon, USA. Changing energy systems are taken into account via multiple dynamic energy provision scenarios. Territorial scale impacts are quantified using both LCA midpoint impact categories and single score indicators derived through multi-criteria decision assessment (MCDA). It is determined that in all probable future scenarios, a biorefinery with PHA-biogas co-production is preferable to a biorefinery only producing biogas. The TM-LCA framework facilitates the capture of technology and regionally specific impacts, such as impacts caused by local energy provision and potential impacts due to limitations in the availability of the defined feedstock leading to additional transport.

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15

Badji, Célia, Ahmed Allal, Jean-Charles Dupin e Frédéric Léonardi. "Impact of Sterilization on the Adhesion Properties of a Polyamide 11 Coating on Textured Metal Substrates". Coatings 14, n.º 4 (31 de março de 2024): 424. http://dx.doi.org/10.3390/coatings14040424.

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Polyamide materials are widely used for medical device coating. However, despite the fragile area at the interface, these devices must conserve their physical and mechanical performance after the sterilization process. In this work, the impact of steam sterilization, widely used in the medical sector, on the adhesion properties of biocompatible and biosourced polyamide-11-coated copper substrates was assessed. The adhesion strength, a quantitative indicator of the coating performance, was assessed thanks to a laboratory-made bench test. The surface of metal substrates was microstructured with laser engraving to enhance the coating adhesion. The Ra roughness value was varied to verify if the depth of valleys induced with the femtosecond laser could favor the interfacial anchoring. Scanning electron microscopy analyses highlighted the physical surface evolution of the polymer analyzed at the interface, across the various texturing parameter values, Ra. Fourier transform infrared spectroscopy was used to monitor the bands specific to polyamide thermo-oxidative degradation. Elemental composition deduced from X-ray photoelectron spectroscopy carried out on the coating after mechanical debonding clearly revealed that the chemical stability of the copper substrates was affected rather than the polyamide coating. Also, we discussed the impact of the chosen sterilization parameters (steam and pressure) on the formation of copper-based species detected with this technique.

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16

Carrasco, Félix, Orlando Santana Pérez, Noel León Albiter e Maria Lluïsa Maspoch. "Improvement of the Thermal Stability of Polymer Bioblends by Means of Reactive Extrusion". Polymers 15, n.º 1 (27 de dezembro de 2022): 105. http://dx.doi.org/10.3390/polym15010105.

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Poly(lactic acid) (PLA) and biosourced polyamide (PA) bioblends, with a variable PA weight content of 10–50%, were manufactured by melt blending in order to improve the behavior of PLA against thermal degradation. The effect of reactive extrusion on the thermal performance of PLA within bioblends was analyzed. The reactive extrusion was made by means of the addition of a styrene-acrylic multi-functional-epoxide oligomeric reactive agent (SAmfE), with the commercial name of Joncryl. Four parameters were considered in order to study the thermal behavior of bioblends against thermal decomposition: the onset decomposition temperature, the shape and temperature interval of the thermal decomposition patterns, the activation energy of the thermal decomposition, and the evidence leading to the most probable mechanism. The latter was determined by means of three evidence: standardized conversion functions, y(α) master plots, and integral mean error. It was shown that reactive extrusion of PLA as well as PA incorporation to the polymer matrix of PLA were responsible for an increase in the onset decomposition temperature of 10.4 °C. The general analytical equation (GAE) was used to evaluate the kinetic parameters of the thermal degradation of PLA within bioblends for various reaction mechanisms. It was shown that the random scission of macromolecular chains is the best mechanism for both untreated and treated PLA by means of reactive extrusion. It was shown that reactive extrusion together with higher content of PA resulted in an increased protective effect against the thermal degradation of PLA as demonstrated by an increase in activation energy of 60 kJ/mol. It was found that there is a relationship between the increase in activation energy and the increase in the onset decomposition temperature when using reactive extrusion. The improvement of the thermal stability of bioblends by means of reactive extrusion was explained by an increase in the complex viscosity from 980 to 2000 Pa·s at 0.06 rad/s and from 250 to 300 Pa·s at 630 rad/s for bioblend containing 30% of PLAREX and by a finer dispersion of PA within the PLAREX matrix. Results from DSC were not conclusive regarding the compatibility between both phases.

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17

Prioglio, Gea, Simone Naddeo, Ulrich Giese, Vincenzina Barbera e Maurizio Galimberti. "Bio-Based Pyrrole Compounds Containing Sulfur Atoms as Coupling Agents of Carbon Black with Unsaturated Elastomers". Nanomaterials 13, n.º 20 (14 de outubro de 2023): 2761. http://dx.doi.org/10.3390/nano13202761.

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In this work, the hysteresis of elastomer composites suitable for tire compounds was reduced by using CB functionalized with pyrrole compounds containing sulfur-based functional groups reactive with the elastomer chains. CB was functionalized with bio-based pyrrole compounds: 2-(2,5-dimethyl-1H-pyrrol-1-yl)ethane-1-thiol (SHP) and 1,2-bis(2-(2,5-dimethyl-1H-pyr-rol-1-yl)ethyl)disulfide (SSP), bearing an -SH and an -SS- functional group, respectively. SHP and SSP were synthesized via a one-pot two-step synthesis, with yields higher than 70%, starting from biosourced chemicals as follows: 2,5-hexanedione from 2,5-dimethylfuran, cysteine and cysteamine. The functionalization of CB was carried out by mixing the CB with PyC and heating, with quantitative yields ranging from 92 to 97%. Thus, the whole functionalization process was characterized by a high carbon efficiency. The formation of the covalent bond between SHP, SSP and CB, in line with the prior art of such a functionalization technology, was proven by means of extraction and TGA analyses. The reactivity of the sulfur-based functional groups with unsaturated polymer chains was demonstrated by using squalene as the model compound. Poly(styrene-co-butadiene) from solution anionic polymerization and poly(1,4-cis-isoprene) from Hevea Brasiliensis were the elastomers employed for the preparation of the composites, which were crosslinked with a sulfur-based system. Pristine CB was partially replaced with CB/SHP (33%) and CB/SSP (33% and 66%). The PyC resulted in better curing efficiency, an increase in the dynamic rigidity of approximately 20% and a reduction in the hysteresis of approximately 10% at 70 °C, as well as similar/better ultimate tensile properties. The best results were achieved with a 66% replacement of CB with CB/SSP. This new family of reactive carbon blacks paves the way for a new generation of ‘green tires’, reinforced by a CB reactive with the polymer chains, which provides high mechanical properties and low rolling resistance. Such a reactive CB eliminates the use of silica, and thus the ethanol emission resulting from the condensation of silane is used as a coupling agent. In addition, CB-based tires are characterized by a higher mileage, at a moment in which the reduction in tire wear has become a primary concern.

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Llanes, Ludovic, Pascal Dubessay, Guillaume Pierre, Cédric Delattre e Philippe Michaud. "Biosourced Polysaccharide-Based Superabsorbents". Polysaccharides 1, n.º 1 (16 de novembro de 2020): 51–79. http://dx.doi.org/10.3390/polysaccharides1010005.

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In the last decades, many studies have been conducted on new materials to meet a growing industrial demand and to move scientific research forward. Superabsorbents are good examples of materials that have generated special attention in many fields for their ability to absorb and retain water up to 1000 times of their dry weight. They found many applications in hygiene products and other products, for a fast growing market of USD 9.58 Billion in 2019. Most of them are composed of synthetic polymers, which are often not environmentally friendly. Therefore, natural superabsorbents and particularly those based on polysaccharides have received a recent increased interest for their biodegradability, biocompatibility, and renewability. This review focuses on polysaccharide-based superabsorbents, on their properties, synthesis methods, and characterization. Their potential applications in many fields, such as biomedical and hygiene, agriculture, water treatment, and the building sector, are also reported with an interest in products already marketed.

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Fang, Xiao Yi, Olivier Vitrac, Sandra Domenek e Violette Ducruet. "Controlling the Molecular Interactions to Improve the Diffusion Barrier of Biosourced Polymers to Organic Solutes". Defect and Diffusion Forum 323-325 (abril de 2012): 269–74. http://dx.doi.org/10.4028/www.scientific.net/ddf.323-325.269.

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The presented original work examines how sorption and diffusion can be combined at molecular scale in nanocomposite materials to improve the resistance to diffusion of biosourced or biodegradable polymers. The concept is applied to apolar penetrants and discussed on polycaprolactone (PCL) containing organomodified montmorillionites acting as nanoadsorbents.

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Ternel, Jérémy, Bastien Léger, Eric Monflier e Frédéric Hapiot. "Amines as effective ligands in iridium-catalyzed decarbonylative dehydration of biosourced substrates". Catalysis Science & Technology 8, n.º 15 (2018): 3948–53. http://dx.doi.org/10.1039/c8cy00621k.

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21

Dobircau, L., L. Rupert, J. Turner, L. Delbreilh, E. Dargent e J. M. Saiter. "Vibro-Acoustic Behaviour in Biosourced Composites". Macromolecular Symposia 328, n.º 1 (junho de 2013): 56–63. http://dx.doi.org/10.1002/masy.201350606.

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Howell, Bob A., Kendahl L. Oberdorfer e Eric A. Ostrander. "Phosphorus Flame Retardants for Polymeric Materials from Gallic Acid and Other Naturally Occurring Multihydroxybenzoic Acids". International Journal of Polymer Science 2018 (24 de dezembro de 2018): 1–12. http://dx.doi.org/10.1155/2018/7237236.

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The development of polymer and polymer additives from renewable biosources is becoming increasingly prominent. This reflects increasing concerns about sustainability, environmental quality, and human health. Bioproducts produced in nature are generally inexpensive and benign in the environment. Moreover, degradation of derivatives does not yield toxic products. Gallic acid (3,4,5-trihydroxybenzoic acid) is found widely in nature and has long been touted for its medicinal qualities. 3,5-Dihydroxybenzoic acid is also produced by several plants, most notably buckwheat. Both compounds, as the anilide and methyl ester, respectively, have been converted to a series of phosphorus esters, both phosphonate and phosphate. Esters have been fully characterized using spectroscopic and thermal methods. These compounds display good flame retardancy at low loadings in DGEBA epoxy resin.

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Chabbah, Taha, Houyem Abderrazak, Radhia Souissi, Patrice Saint-Martin, Herve Casabianca, Saber Chatti, Regis Mercier et al. "A Sensitive Impedimetric Sensor Based on Biosourced Polyphosphine Films for the Detection of Lead Ions". Chemosensors 8, n.º 2 (11 de maio de 2020): 34. http://dx.doi.org/10.3390/chemosensors8020034.

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In this work, impedimetric sensors were developed for the detection of the four WFD heavy metals Pb2+, Cd2+, Hg2+ and Ni2+, by the modification of a gold electrode with four partially biosourced polyphosphine polymers. These polymers were obtained with satisfactory yields by polycondensation of the bis(4-fluorophenyl)(4-methylphenyl)phosphine sulfide and the bis(4-fluorophenyl)(4-methylphenyl)phosphine oxide using isosorbide or bisphenol A. The chemical structures and number-average molecular weights of the resulting polymers were determined by NMR spectroscopy (1H, 19F, and 31P) and by size exclusion chromatography. Glass transition temperatures varied between 184 and 202 °C depending on the composition of polymers. The bio-based poly(etherphosphine) oxide modified sensor showed better analytical performance than petrochemical based oxide for the detection of Pb2+. A detection limit of 10−10 g/L or 0.5 pM, which is 104 times lower than that of the anodic stripping voltammetric and the potentiometric sensors. A reversibility is obtained through rinsing of the impedimetric sensor with an EDTA solution.

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Bensabeh, Nabil, Ana Jiménez-Alesanco, Ilme Liblikas, Juan C. Ronda, Virginia Cádiz, Marina Galià, Lauri Vares, Olga Abián e Gerard Lligadas. "Biosourced All-Acrylic ABA Block Copolymers with Lactic Acid-Based Soft Phase". Molecules 25, n.º 23 (5 de dezembro de 2020): 5740. http://dx.doi.org/10.3390/molecules25235740.

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Lactic acid is one of the key biobased chemical building blocks, given its readily availability from sugars through fermentation and facile conversion into a range of important chemical intermediates and polymers. Herein, well-defined rubbery polymers derived from butyl lactate solvent were successfully prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization of the corresponding monomeric acrylic derivative. Good control over molecular weight and molecular weight distribution was achieved in bulk using either monofunctional or bifunctional trithiocarbonate-type chain transfer agents. Subsequently, poly(butyl lactate acrylate), with a relative low Tg (−20 °C), good thermal stability (5% wt. loss at 340 °C) and low toxicity was evaluated as a sustainable middle block in all-acrylic ABA copolymers using isosorbide and vanillin-derived glassy polyacrylates as representative end blocks. Thermal, morphological and mechanical properties of copolymers containing hard segment contents of <20 wt% were evaluated to demonstrate the suitability of rubbery poly(alkyl lactate) building blocks for developing functional sustainable materials. Noteworthy, 180° peel adhesion measurements showed that the synthesized biosourced all-acrylic ABA copolymers possess competitive performance when compared with commercial pressure-sensitive tapes.

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Ghahri, Saman, Antonio Pizzi e Reza Hajihassani. "A Study of Concept to Prepare Totally Biosourced Wood Adhesives from Only Soy Protein and Tannin". Polymers 14, n.º 6 (13 de março de 2022): 1150. http://dx.doi.org/10.3390/polym14061150.

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This is a study of concept on the initial application for wood adhesives totally biosourced from the covalent reaction between soy protein isolate (SPI) and a commercial flavonoid tannin, namely quebracho tannin. The adhesive is composed exclusively of the two vegetable biomaterials mentioned and thus is totally biosourced and non-toxic, as tannin has been classified as being not at all toxic by the European Commission REACH program. The pre-reaction between the two yielded the best plywood bonding results when limited to a temperature of 40 °C, final cross-linking being achieved during the plywood higher temperature hot pressing procedure, as for any other thermosetting adhesive. Pre-reaction at higher temperatures, namely 60 °C and 80 °C, achieved extensive premature cross-linking that lost any activity to cross-link further when hot pressed for preparing plywood. The reaction was followed by thermomechanical analysis, by matrix assisted laser desorption ionization time of flight (MALDI ToF) mass spectrometry, and by plywood shear strength tested dry, after a 24 h cold water soak and 1 h in boiling water. The adhesive of this approach lends itself to be further reinforced by the multitude of approaches on soy resins already developed by several other research groups.

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WOLF, Marc-Andree, Thilo KUPFER, Martin BAITZ e Peter EYERER. "Life Cycle Sustainability-R&D of biosource based polymers." Journal of Advanced Science 13, n.º 3 (2001): 121–24. http://dx.doi.org/10.2978/jsas.13.121.

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Kassi, Eleni, e Costas S. Patrickios. "Well-Defined Polymers from Biosourced Monomers: The Case of 2-(Methacryloyloxy)ethyl Tiglate". Macromolecules 43, n.º 3 (9 de fevereiro de 2010): 1411–15. http://dx.doi.org/10.1021/ma9023312.

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Edling, H. Eliot, Hua Sun, Edward Paschke, David A. Schiraldi, James M. Tanko, Mark Paradzinsky e S. Richard Turner. "High barrier biosourced polyester from dimethyl [2,2′-bifuran]-5,5′-dicarboxylate". Polymer 191 (março de 2020): 122258. http://dx.doi.org/10.1016/j.polymer.2020.122258.

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Dumur, Frédéric. "Recent Advances in Visible Light Photoinitiating Systems Based on Flavonoids". Photochem 3, n.º 4 (12 de dezembro de 2023): 495–529. http://dx.doi.org/10.3390/photochem3040030.

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The design of biosourced and/or bioinspired photoinitiators is an active research field as it offers a unique opportunity to develop photoinitiating systems exhibiting better biocompatibility as well as reduced toxicity. In this field, flavonoids can be found in numerous fruits and vegetables so these structures can be of interest for developing, in the future, polymerization processes, offering a reduced environmental impact but also better biocompatibility of the polymers. In this review, the different flavonoids reported to date as photoinitiators of polymerization are presented. Over the years, different modifications of the flavonoid scaffold have been examined including the grafting of well-known chromophores, the preparation of Type II photoinitiators or the introduction of photocleavable groups enabling the generation of Type I photoinitiators. Different families of flavonoids have also been investigated, enabling to design of high-performance photoinitiating systems.

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Boussatour, G., P. Y. Cresson, B. Genestie, N. Joly, J. F. Brun e T. Lasri. "Measurement of the thermal conductivity of flexible biosourced polymers using the 3-omega method". Polymer Testing 70 (setembro de 2018): 503–10. http://dx.doi.org/10.1016/j.polymertesting.2018.07.026.

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Negui, Mekki, Zhao Zhang, Charles Foucher, Erwann Guénin, Aurore Richel, Victorien Jeux e Vincent Terrasson. "Wood-Sourced Polymers as Support for Catalysis by Group 10 Transition Metals". Processes 10, n.º 2 (11 de fevereiro de 2022): 345. http://dx.doi.org/10.3390/pr10020345.

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Despite providing interesting solutions to reduce the number of synthetic steps, to decrease energy consumption or to generate less waste, therefore contributing to a more sustainable way of producing important chemicals, the expansion of the use of homogeneous catalysis in industrial processes is hampered by several drawbacks. One of the most important is the difficulty to recycle the noble metals generating potential high costs and pollution of the synthesized products by metal traces detrimental to their applications. Supporting the metals on abundant and cheap biosourced polymers has recently appeared as an almost ideal solution: They are much easier to recover from the reaction medium and usually maintain high catalytic activity. The present bibliographical review focuses on the development of catalysts based on group 10 transition metals (nickel, palladium, platinum) supported on biopolymers obtained from wood, such as cellulose, hemicellulose, lignin, and their derivatives. The applications of these catalysts in organic synthesis or depollution are also addressed in this review with examples of C-C couplings, oxidation, or hydrogenation reactions.

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Dong, Wenyong, Xiaojun Cao e Yongjin Li. "High-performance biosourced poly(lactic acid)/polyamide 11 blends with controlled salami structure". Polymer International 63, n.º 6 (8 de outubro de 2013): 1094–100. http://dx.doi.org/10.1002/pi.4618.

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M’sahel, Malek, Ayoub Elmahdi, Raouf Medimagh, Eric Drockenmuller e Mongia Said Zina. "Synthesis and characterization of novel biosourced building blocks from isosorbide". Designed Monomers and Polymers 19, n.º 2 (1 de janeiro de 2016): 108–18. http://dx.doi.org/10.1080/15685551.2015.1124317.

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Stoclet, G., R. Seguela e J. M. Lefebvre. "Morphology, thermal behavior and mechanical properties of binary blends of compatible biosourced polymers: Polylactide/polyamide11". Polymer 52, n.º 6 (março de 2011): 1417–25. http://dx.doi.org/10.1016/j.polymer.2011.02.002.

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Medimagh, R., H. Aloui, M. Jemli, H. Chaabane, F. Belkahla e K. Khwaldia. "Enhanced functional properties of chitosan films cross-linked by biosourced dicarboxylic acids". Polymer Science Series A 58, n.º 3 (15 de abril de 2016): 409–18. http://dx.doi.org/10.1134/s0965545x16030123.

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Li, Qiong, Songqi Ma, Pengyun Li, Binbo Wang, Hongzhi Feng, Na Lu, Sheng Wang, Yanlin Liu, Xiwei Xu e Jin Zhu. "Biosourced Acetal and Diels–Alder Adduct Concurrent Polyurethane Covalent Adaptable Network". Macromolecules 54, n.º 4 (10 de fevereiro de 2021): 1742–53. http://dx.doi.org/10.1021/acs.macromol.0c02699.

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Yu, Yan, Li-Ming Fang, Ye Liu e Xiao-Bing Lu. "Chemical Synthesis of CO2-Based Polymers with Enhanced Thermal Stability and Unexpected Recyclability from Biosourced Monomers". ACS Catalysis 11, n.º 13 (23 de junho de 2021): 8349–57. http://dx.doi.org/10.1021/acscatal.1c01376.

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Isadounene, Samra, Dalila Hammiche, Amar Boukerrou, Denis Rodrigue e Hocine Djidjelli. "Accelerated Ageing of Alkali Treated Olive Husk Flour Reinforced Polylactic Acid (PLA) Biocomposites: Physico-Mechanical Properties". Polymers and Polymer Composites 26, n.º 3 (março de 2018): 223–32. http://dx.doi.org/10.1177/096739111802600302.

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In this study, olive husk flour was added to poly(lactic acid) (PLA) to produce fully biosourced and biodegradable composites. In particular, untreated and alkali treated particles were used to produce the biocomposites at 20 wt.% via melt extrusion followed by injection moulding. The samples were then subjected to accelerated ageing (UV irradiation and water spray at 50°C) for different amounts of time (120, 240, 360 and 480 h). The results show that accelerated ageing decreased the tensile strength (TS) and Young's modulus (YM) for both untreated and alkali treated biocomposites, but the treated particles presented a lower reduction. Further comparison was made via differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) to detect any changes in the samples.

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Kallel Elloumi, Amira, Imen Abdelhedi Miladi, Anatoli Serghei, Daniel Taton, Karim Aissou, Hatem Ben Romdhane e Eric Drockenmuller. "Partially Biosourced Poly(1,2,3-triazolium)-Based Diblock Copolymers Derived from Levulinic Acid". Macromolecules 51, n.º 15 (25 de julho de 2018): 5820–30. http://dx.doi.org/10.1021/acs.macromol.8b00962.

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Desnoes, Eric, Lotfi Toubal, Amel Hadj Bouazza e Daniel Montplaisir. "Biosourced vanillin Schiff base platform monomers as substitutes for DGEBA in thermoset epoxy". Polymer Engineering & Science 60, n.º 10 (16 de setembro de 2020): 2593–605. http://dx.doi.org/10.1002/pen.25497.

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Mincheva, Rosica, Franck Meyer, Pierre Verge, Jean-Marie Raquez, Leen Billiet, Filip Du Prez e Philippe Dubois. "Synthesis of Clicked Imidazolium-Containing Biosourced Copolymers and Application in Carbon Nanotube Dispersion". Macromolecular Rapid Communications 32, n.º 24 (22 de novembro de 2011): 1960–64. http://dx.doi.org/10.1002/marc.201100566.

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Delgado-Sánchez, C., J. Sarazin, F. J. Santiago-Medina, V. Fierro, A. Pizzi, S. Bourbigot e A. Celzard. "Impact of the formulation of biosourced phenolic foams on their fire properties". Polymer Degradation and Stability 153 (julho de 2018): 1–14. http://dx.doi.org/10.1016/j.polymdegradstab.2018.04.006.

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Benabbas, Rihab, Noelia M. Sanchez-Ballester, Adrien Aubert, Tahmer Sharkawi, Bernard Bataille e Ian Soulairol. "Performance Evaluation of a Novel Biosourced Co-Processed Excipient in Direct Compression and Drug Release". Polymers 13, n.º 6 (23 de março de 2021): 988. http://dx.doi.org/10.3390/polym13060988.

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This study exposes the potential usefulness of a new co-processed excipient, composed of alginic acid and microcrystalline cellulose (Cop AA-MCC), for the preparation of immediate drug release tablets by direct compression. Evaluation of the physical and mechanical properties as well as the disintegration behavior of Cop AA-MCC in comparison to commercial co-processed excipients (Cellactose®, Ludipress®, Prosolv® SMCC HD90 and Prosolv® ODT) and to the physical mixture of the native excipients (MCC and AA), was carried out. The obtained results illustrate the good performance of Cop AA-MCC in terms of powder flowability, tablet tensile strength, compressibility, and disintegration time. Although, this new co-processed excipient showed a slightly high lubricant sensitivity, which was explained by its more plastic than fragmentary deformation behavior, it presented a low lubricant requirement due to the remarkably low ejection force observed during compression. Compression speed and dwell time seemed not to affect significantly the tabletability of Cop AA-MCC. The study exposed evenly the performance of Cop AA-MCC compared to Prosolv® ODT, in terms of tabletability and dissolution rate of Melatonin. Cop AA-MCC presented comparable hardness, lower dilution potential, higher lubricant sensitivity, lower ejection force, and faster Melatonin’s release time than Prosolv® ODT. In summary, Cop AA-MCC exhibited interesting physical, mechanical, and biopharmaceutical properties, which demonstrate its concurrence to commercially available co-processed excipients. Furthermore, the simplicity of its composition and the scalability of its elaboration makes this multifunctional excipient highly recommended for direct compression.

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Zhang, Yijun, Hong Chen, Shaohui Liu, Ludovic Josien, Gautier Schrodj, Angélique Simon‐Masseron e Jacques Lalevée. "Photopolymerization of Pollen Based Biosourced Composites and Applications in 3D and 4D Printing". Macromolecular Materials and Engineering 306, n.º 6 (26 de abril de 2021): 2000774. http://dx.doi.org/10.1002/mame.202000774.

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Saadaoui, Asma, Raouf Medimagh, Sylvain Marque, Damien Prim, Saber Chatti, Herve Casabianca e Mongia Said Zina. "New biosourced AA and AB monomers from 1,4:3,6-dianhydrohexitols, Isosorbide, Isomannide, and Isoidide". Designed Monomers and Polymers 20, n.º 1 (23 de outubro de 2016): 221–33. http://dx.doi.org/10.1080/15685551.2016.1239175.

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Li, Wenxin, Junyi Zhao, Xuequan Zhang e Dirong Gong. "Capability of PN3-type Cobalt Complexes toward Selective (Co-)Polymerization of Myrcene, Butadiene, and Isoprene: Access to Biosourced Polymers". Industrial & Engineering Chemistry Research 58, n.º 8 (fevereiro de 2019): 2792–800. http://dx.doi.org/10.1021/acs.iecr.8b05866.

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Jlalia, Ibtissem, Fares Zouaoui, Taha Chabbah, Saber Chatti, Patrice Saint-Martin, Herve Casabianca, Sylvain Minot et al. "Adsorption Characteristics of WFD Heavy Metal Ions on New Biosourced Polyimide Films Determined by Electrochemical Impedance Spectroscopy". Journal of Inorganic and Organometallic Polymers and Materials 31, n.º 6 (27 de janeiro de 2021): 2471–82. http://dx.doi.org/10.1007/s10904-020-01842-w.

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Magaletti, Federica, Fatima Margani, Alessandro Monti, Roshanak Dezyani, Gea Prioglio, Ulrich Giese, Vincenzina Barbera e Maurizio Stefano Galimberti. "Adducts of Carbon Black with a Biosourced Janus Molecule for Elastomeric Composites with Lower Dissipation of Energy". Polymers 15, n.º 14 (22 de julho de 2023): 3120. http://dx.doi.org/10.3390/polym15143120.

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Elastomer composites with low hysteresis are of great importance for sustainable development, as they find application in billions of tires. For these composites, a filler such as silica, able to establish a chemical bond with the elastomer chains, is used, in spite of its technical drawbacks. In this work, a furnace carbon black (CB) functionalized with polar groups was used in replacement of silica, obtaining lower hysteresis. CBN326 was functionalized with 2-(2,5-dimethyl-1H-pyrrol-1-yl)-1,3-propanediol (serinol pyrrole, SP), and samples of CB/SP adducts were prepared with different SP content, ranging from four to seven parts per hundred carbon (phc). The entire process, from the synthesis of SP to the preparation of the CB/SP adduct, was characterized by a yield close to 80%. The functionalization did not alter the bulk structure of CB. Composites were prepared, based on diene rubbers—poly(1,4-cis-isoprene) from Hevea Brasiliensis and poly(1,4-cis-butadiene) in a first study and synthetic poly(1,4-cis-isoprene) in a second study—and were crosslinked with a sulfur-based system. A CB/silica hybrid filler system (30/35 parts) was used and the partial replacement (66% by volume) of silica with CB/SP was performed. The composites with CB/SP exhibited more efficient crosslinking, a lower Payne effect and higher dynamic rigidity, for all the SP content, with the effect of the functionalized CB consistently increasing the amount of SP. Lower hysteresis was obtained for the composites with CB/SP. A CB/SP adduct with approximately 6 phc of SP, used in place of silica, resulted in a reduction in ΔG′/G′ of more than 10% and an increase in E’ at 70 °C and in σ300 in tensile measurements of about 35% and 30%, respectively. The results of this work increase the degrees of freedom for preparing elastomer composites with low hysteresis, allowing for the use of either silica or CB as filler, with a potentially great impact on an industrial scale.

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Noppalit, Sayrung, Alexandre Simula, Nicholas Ballard, Xavier Callies, José M. Asua e Laurent Billon. "Renewable Terpene Derivative as a Biosourced Elastomeric Building Block in the Design of Functional Acrylic Copolymers". Biomacromolecules 20, n.º 6 (2 de maio de 2019): 2241–51. http://dx.doi.org/10.1021/acs.biomac.9b00185.

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Medimagh, Raouf, Maissa Meddeb Smaidia, Haythem Bennour e Saber Chatti. "Synthesis and evaluation of the thermal properties of biosourced poly(ether)ureas and copoly(ether)ureas from 1,4:3,6-dianhydrohexitols". Polymer International 64, n.º 4 (24 de outubro de 2014): 513–20. http://dx.doi.org/10.1002/pi.4819.

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