Synthesis of New Nitrogen Substituted Polybenzimidazoles

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.

scholarly journals Fully Lignocellulose-Based PET Analogues for the Circular Economy

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>

scholarly journals Fully Lignocellulose-Based PET Analogues for the Circular Economy

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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