INTRODUCTION A synthetic water-soluble meso-tetra(2,6-dichloro-3-sulfonatophenyl)porphyrinate of iron(III) chloride, Fe-(TDCPPS)Cl, was employed to catalyze the oxidative co-polymerization of penta-halogenated phenols in two humic materials of different origin. MATERIALS AND METHODS Co-polymerization of pentachlorophenol (PCP) was followed by high-performance size-exclusion chromatography (HP...

2,5-diformylfuran (DFF) is a promising green platform chemical obtainable by selective oxidation of 5-(hydroxymethyl)furfural (HMF). In this work, high-purity DFF was synthesized from HMF and compared to formaldehyde (F) in terms suitability for polymerization aqueous solution with various phenolic model substances that may be depolymerization lignin. Resorcinol, catechol, phloroglucinol formed...

The activity of cerium alkoxide complexes supported by a Schiff base ligand was controlled using redox reagents during the ring-opening polymerization of L-lactide. The rate of L-lactide polymerization was modified by switching in situ between the cerium(III) and cerium(IV) species.

The last two decades efforts have been made in investigation of genes that encode proteins involved in pathogenesis of emphysema and chronic obstructive pulmonary disease (COPD). So far, SERPINA1 gene which encodes protein alpha-1-antitrypsin (A1AT) is the only defined genetic risk factor associated with early development of emphysema. The A1AT is dominant protein of 1 electrophoretic fraction...

Lignin is one of the most abundant biopolymers, and it has a complex racemic structure. It may be formed by a radical polymerization initiated by redox enzymes, but much remains unknown about the process, such as how molecules as large as enzymes can generate the compact structure of the lignified plant cell wall. We have synthesized lignin oligomers according to a new concept, in which peroxid...

Abstract In the present work, 4-methylcatechol oligomer has been prepared by using enzyme-catalyzed polymerization in water and preliminary evaluations as stabilizing agent polypropylene (PP) was performed. comparison with intrinsic PP, oxidation onset temperature of oligomer/PP composite increased 66°C, induction time 40 min. addition, mixing a PP (i.e., formation composite) did significantly ...

A series of new norbornene monomers containing sterically hindered phenol groups have been synthesized and polymerized via ring-opening metathesis polymerization (ROMP) using the Grubbs 3rd generation catalyst (G3’). ROMPs exhibit first-order kinetics molar masses increase linearly with monomer conversion well-controlled hindered-functionalized polynorbornenes were obtained a to initiator ratio...

2,5-Furan dicarboxylic acid (FDCA) is a promising intermediate for producing polyethylene furan dicarboxylate, an alternative to terephthalate that combines significantly lower greenhouse gas footprint with better mechanical and barrier properties. This work presents process design techno-economic evaluation FDCA from non-edible biomass via the oxidation of furfural furoate salt, subsequent car...

This research aimed to analyze the characteristics of adhesive using variation crosslinking agents. The types agents were citric acid and oxalic which have capability create a bond with cassava starch-PVA adhesive. synthesis process was conducted through gelatinization, hydrolysis, oxidation, polymerization. reaction run three-neck flask mercury stirrer at 70 °C 1 atm. characteristic such as vi...