Nouvelles données historiques sur les premiers dinosaures trouvés en France

Brignon, A.

doi:10.1051/bsgf/2018003

Cited by 5 publications

(6 citation statements)

References 24 publications

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“…In fact, BPA exhibits one of the highest production volume of chemicals worldwide [ 7 ], with a manufacture of approximately 3.8 million tons per year in 2006 [ 54 ]. About 80% of the global production of BPA is used for the synthesis of polycarbonate, 18% for epoxy resins and the remainder for other applications, such as food containers, paper products (e.g., thermal receipts), water pipes, toys, medical equipment, and electronics [ 6 , 7 ]. As a consequence, human beings and environment are constantly exposed to BPA: it has been detected in 95% of human urine samples, which indicates that this compound may leach into food or water [ 7 , 8 , 9 , 55 ].…”

Section: Toxicity Of Bisphenol a And Regulationsmentioning

confidence: 99%

“…Aromatic compounds are widely used in organic materials for their stability, their toughness, and above all their ability to structure the matter by π-stacking, thus allowing BPA to confer good thermal and mechanical properties to the epoxy thermosets. Commercialized for more than 50 years, BPA, mainly through its epoxy form DiGlycidylEther of Bisphenol A (DGEBA), is nowadays spread in many coatings, adhesives, laminates and composites, but also many domestic or even health related-products such as plastic bags, food containers and metal cans, dental sealants, soaps and lotions [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, epoxy thermosets are sensitive to hydrolysis, which may cause BPA to leach, leading to widespread human exposure [ 6 , 7 , 8 , 9 ]. Unfortunately, it has been classified as carcinogen mutagen and reprotoxic (CMR), and is recognized as an endocrine disruptor [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Bio-Based Aromatic Epoxy Monomers for Thermoset Materials

et al. 2017

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The synthesis of polymers from renewable resources is a burning issue that is actively investigated. Polyepoxide networks constitute a major class of thermosetting polymers and are extensively used as coatings, electronic materials, adhesives. Owing to their outstanding mechanical and electrical properties, chemical resistance, adhesion, and minimal shrinkage after curing, they are used in structural applications as well. Most of these thermosets are industrially manufactured from bisphenol A (BPA), a substance that was initially synthesized as a chemical estrogen. The awareness on BPA toxicity combined with the limited availability and volatile cost of fossil resources and the non-recyclability of thermosets implies necessary changes in the field of epoxy networks. Thus, substitution of BPA has witnessed an increasing number of studies both from the academic and industrial sides. This review proposes to give an overview of the reported aromatic multifunctional epoxide building blocks synthesized from biomass or from molecules that could be obtained from transformed biomass. After a reminder of the main glycidylation routes and mechanisms and the recent knowledge on BPA toxicity and legal issues, this review will provide a brief description of the main natural sources of aromatic molecules. The different epoxy prepolymers will then be organized from simple, mono-aromatic di-epoxy, to mono-aromatic poly-epoxy, to di-aromatic di-epoxy compounds, and finally to derivatives possessing numerous aromatic rings and epoxy groups.

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Section: Toxicity Of Bisphenol a And Regulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bio-Based Aromatic Epoxy Monomers for Thermoset Materials

et al. 2017

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“…It is interesting to note that a humerus of a dinosaur identified as belonging to the genus Aepisaurus has been found in the Albian sandy facies (Gervais, 1848(Gervais, -1852Brignon, 2018). In the lack of data regarding its precise stratum, one may hypothesise that this dinosaur remain originates from the amber-bearing level which yield terrestrial elements such as plant debris.…”

mentioning

confidence: 99%

Reassessment of amber-bearing deposits of Provence, southeastern France

Martin¹,

Dutour²,

Ebbo³

et al. 2021

BSGF - Earth Sci. Bull.

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The presence of “geological” amber (or “succin” in old French monographs) has been reported for several centuries in Provence in the Mesozoic deposits of Provence, southeastern France. Diverse amber-bearing sites have been inventoried but their location and precise age remained unclear for most of them. In the past decades, various data concerning chemistry, palaeontological content and comparison with archaeological improved our knowledge of the ambers of the region, but only of Cretaceous age. The present review of the amber-bearing deposits of Provence, including the discovery of new sites, highlights the amber potential of Provence and allow to consider a wide range times, from the lower Cretaceous to the Miocene.

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“…Currently, 95% of thermosetting epoxy materials are obtained from diglycidyl ether of bisphenol A (DGEBA). The aromatic rings of bisphenol A (BPA) are particularly interesting since they confer good thermal resistance to epoxy resins.…”

Section: Introductionmentioning

confidence: 99%

New bio‐based epoxy materials and foams from microalgal oil

Négrell

Cornille

Nascimento

et al. 2016

Euro J Lipid Sci & Tech

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Microalgae are a potential source of renewable energy but could also interesting lead to a platform for oleochemicals. Hence, the oil obtained from Schizochytrium microalgae, with a high content in unsaturations, was dedicated to the synthesis of polymer materials. After the determination of its structure, algal oil was epoxidized in presence of exchange cation resin to reach a high functionality of ten epoxy functions per molecule. Then, fully bio‐based epoxy networks were synthesized with priamine® (oleic acid dimer‐derived amine) as hardener. These new algal epoxy materials were characterized and compared with vegetable oils derived epoxy networks (linseed or soybean oils). Epoxy co‐monomers were added to the formulation in order to improve the material properties. We added both trimethylolpropane triglycidyl ether, a classical crosslinking agent, and triepoxided phloroglucinol, derived from algal phlorotannins. The addition epoxy co‐monomers allowed to obtain materials with various properties. The thermal and mechanical properties highlighted the interesting superiority of algal oils with their high content in reactive functions. Finally, the addition of a blowing agent (MH15 polysiloxane) led to the synthesis of algal oils derived foams with interesting properties. Thus, algal oil demonstrated interesting potential as a viable starting material for fully bio‐based thermosetting materials and foams. Practical applications: The main reactant described in this article, that is, epoxidized algal oil (EAO), provides bio‐based aliphatic building blocks for further epoxy foams syntheses by reaction with vegetable oil derived amines and another aromatic epoxy co‐monomer. The obtained epoxy materials and foams are bio‐based with various rigidities and high cross‐linking ratio. Materials may be used in electronics and electrical systems or for high‐performance adhesives. Foams may be applied as thermal and vibration isolation and for the production of lightweight materials or the transportation industry such as aircraft‐interior panels and crash pads. For the more flexible foams, medical applications could be considered.

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Nouvelles données historiques sur les premiers dinosaures trouvés en France

Cited by 5 publications

References 24 publications

Bio-Based Aromatic Epoxy Monomers for Thermoset Materials

Bio-Based Aromatic Epoxy Monomers for Thermoset Materials

Reassessment of amber-bearing deposits of Provence, southeastern France

New bio‐based epoxy materials and foams from microalgal oil

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