Fully Lignocellulose-Based PET Analogues for the Circular Economy

10.26434/chemrxiv.14627745 ◽

2021 ◽

Author(s):

Xianyuan Wu ◽

Maxim Galkin ◽

Zhuohua Sun ◽

Katalin Barta

Keyword(s):

Thermal Properties ◽

Dicarboxylic Acid ◽

Circular Economy ◽

Terephthalic Acid ◽

Methyl Esters ◽

Woody Biomass ◽

Environmental Concerns ◽

Metal Free ◽

Raney Ni ◽

Excellent Chemical

Polyethylene terephthalate (PET) is one of the most abundantly used polymers, but also a significant pollutant in oceans. Due to growing environmental concerns, novel PET alternatives are highly sought after. Here we present readily recyclable PET analogues made entirely from woody biomass. Central to the concept is a two-step noble metal free catalytic sequence (Cu20-PMO catalyzed reductive catalytic fractionation and Raney Ni mediated catalytic funneling) that allows for obtaining a single aliphatic diol (PC) in 56.4% efficiency as well as other product streams convertible to fuels. The diol PC is co-polymerized with methyl esters of terephthalic acid (TPA) and furan dicarboxylic acid (FDCA), both of which can be derived from the cellulose residues, to obtain polyesters with competitive Mw and thermal properties (Tg of 70–90 °C). The new polymers show excellent chemical recyclability in methanol and are thus promising candidates for the circular economy.<br>

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Synthesis of New Nitrogen Substituted Polybenzimidazoles

MRS Proceedings ◽

10.1557/proc-134-133 ◽

1988 ◽

Vol 134 ◽

Author(s):

James J. Kane ◽

Naim Akmal ◽

Chetan Jariwala ◽

Mark Sinsky

Keyword(s):

Thermal Properties ◽

Dicarboxylic Acid ◽

Terephthalic Acid ◽

Polyphosphoric Acid ◽

Aprotic Solvent ◽

Isophthalic Acid ◽

Acid Chlorides ◽

Model Compounds ◽

Polar Aprotic Solvent ◽

Pyridine Dicarboxylic Acid

ABSTRACTN1,N4-diphenyl-1,2,4,5-tetraaminobenzene was condensed with the di-acid chlorides of terephthalic acid, isophthalic acid and 2,5-pyridine-dicarboxylic acid in polar aprotic solvent to give the poly(o-phenylamino)amides which, after cyclodehydration in polyphosphoric, acid gave three new N,N'-diphenyl substituted polybenzimidazoles (PBI). The syntheses and certain of the solution and thermal properties of the PBI's are discussed. The synthesis of three new tetraamine monomers and their related model compounds is also described.

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Fish Waste: From Problem to Valuable Resource

Marine Drugs ◽

10.3390/md19020116 ◽

2021 ◽

Vol 19 (2) ◽

pp. 116

Author(s):

Daniela Coppola ◽

Chiara Lauritano ◽

Fortunato Palma Esposito ◽

Gennaro Riccio ◽

Carmen Rizzo ◽

...

Keyword(s):

Circular Economy ◽

Bioactive Peptides ◽

Added Value ◽

Environmental Concerns ◽

Economic Sector ◽

Valuable Resource ◽

Fish Waste ◽

The World ◽

Global Population ◽

Aquaculture Production

Following the growth of the global population and the subsequent rapid increase in urbanization and industrialization, the fisheries and aquaculture production has seen a massive increase driven mainly by the development of fishing technologies. Accordingly, a remarkable increase in the amount of fish waste has been produced around the world; it has been estimated that about two-thirds of the total amount of fish is discarded as waste, creating huge economic and environmental concerns. For this reason, the disposal and recycling of these wastes has become a key issue to be resolved. With the growing attention of the circular economy, the exploitation of underused or discarded marine material can represent a sustainable strategy for the realization of a circular bioeconomy, with the production of materials with high added value. In this study, we underline the enormous role that fish waste can have in the socio-economic sector. This review presents the different compounds with high commercial value obtained by fish byproducts, including collagen, enzymes, and bioactive peptides, and lists their possible applications in different fields.

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Synthesis and Characterization of Zirconium Metal Complexes Derived from Benzene-1, 4-dicarboxylic acid

Journal of the chemical society of pakistan ◽

10.52568/000692 ◽

2020 ◽

Vol 42 (6) ◽

pp. 919-919

Author(s):

Hafiz Muhammad Arshad Hafiz Muhammad Arshad ◽

Shazia Khurshid Shazia Khurshid ◽

Shahzad Sharif Shahzad Sharif ◽

Muhammad Ali Muhammad Ali ◽

Muhammad Dilshad Muhammad Dilshad ◽

...

Keyword(s):

Metal Complexes ◽

Dicarboxylic Acid ◽

Terephthalic Acid ◽

Research Work ◽

Early Developmental Stage ◽

Practical Applications ◽

Secondary Building Units ◽

Ft Ir ◽

Zirconium Metal

Amongst organo-metallic frameworks (OMFs), the metallic framework having Zirconium metal indicate fascinating structural properties and excellent stability. Such organo-metallic frameworks (OMFs) function as a potential material for practical application. Even though these particular organo-metallic frameworks are in the early developmental stage but considerable advancements have been carried out recently. We studied the characterization of zirconium-based organo-metallic frameworks. We built Zr-based OMFs by four different synthetic ways. Initially, upgraded preparation under green and commercially feasible conditions has been carried out by modifying Zr-OMFs. Zirconium based OMFs having different structures are then classified and explained based on various organic ligands and zirconium-based secondary building units. We have synthesized the zirconium metal complexes; they have been characterized on the bases of FT-IR and CHNS analyzer. FT-IR results show binding of metal with the Benzene-1, 4-dicarboxylic acid [C6H4 (COOH) 2]. Zirconium metal can bind with the organic substances for the construction of a variety of complexes. From my research work, it is concluded that zirconium metal forms a polymeric complex with terephthalic acid. In which oxygen atoms of Terephthalic acid form bridging structure with the zirconium metal. Our study based on a particular type of OMF is likely expected to present guidance for in-depth exploration of OMFs towards practical applications. It is concluded that the metal-organic frameworks (MOFs) of zirconium metal have many applications in the field of chemistry, biology and other numerous fields of science

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Recent advances in graphitic carbon nitride as catalyst for heterogeneous Fenton-like reaction

Dalton Transactions ◽

10.1039/d1dt02367e ◽

2021 ◽

Author(s):

Jia Fei ◽

Xin Peng ◽

Longbo Jiang ◽

Xingzhong Yuan ◽

Xiangyan Chen ◽

...

Keyword(s):

Thermal Properties ◽

Carbon Nitride ◽

Graphitic Carbon ◽

Graphitic Carbon Nitride ◽

Heterogeneous Fenton ◽

Metal Free ◽

Recent Advances ◽

Stable Chemical ◽

Structural Regulation

Graphitic carbon nitride (g-C3N4), an appealing metal-free polymer has gained extensive research in heterogeneous Fenton-like reactions owing to its advantages of stable chemical and thermal properties, easy of structural regulation...

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1,3-Dioxolan-4-Ones as Promising Monomers for Aliphatic Polyesters: Metal-Free, in Bulk Preparation of PLA

Polymers ◽

10.3390/polym12102396 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2396

Author(s):

Stefano Gazzotti ◽

Marco Aldo Ortenzi ◽

Hermes Farina ◽

Alessandra Silvani

Keyword(s):

Molecular Weight ◽

Thermal Properties ◽

Acid Catalyst ◽

Monomer Conversion ◽

Reaction Conditions ◽

Aliphatic Polyesters ◽

Metal Free ◽

Weight Growth ◽

Double Activation

The first example of solvent-free, organocatalyzed, polymerization of 1,3-dioxolan-4-ones, used as easily accessible monomers for the synthesis of polylactic acid (PLA), is described here. An optimization of reaction conditions was carried out, with p-toluensulfonic acid emerging as the most efficient Brønsted acid catalyst. The reactivity of the monomers in the tested conditions was studied following the monomer conversion by 1H NMR and the molecular weight growth by SEC analysis. A double activation polymerization mechanism was proposed, pointing out the key role of the acid catalyst. The formation of acetal bridges was demonstrated, to different extents depending on the nature of the aldehyde or ketone employed for lactic acid protection. The polymer shows complete retention of stereochemistry, as well as good thermal properties and good polydispersity, albeit modest molecular weight.

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