Polyamide-imides bearing furan moieties. 1. Solution polycondensation of aromatic dianhydrydes with 2-furoic acid dihydrazides

Abid, Souhir; Gharbi, Rachid El; Gandini, Alessandro

doi:10.1016/j.polymer.2004.06.065

Cited by 40 publications

(15 citation statements)

References 15 publications

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“…Reaction of carbohydrazide 1 with acid anhydride 55 to produce pyrrole derivative 57 was carried out via thermal cyclodehydration of the dicarboxylic acid 56 at 150°C or during heating with thionyl chloride [55]. …”

Section: Reactions Of Carbohydrazidesmentioning

confidence: 99%

Chemistry and heterocyclization of carbohydrazides

Hassan

Shawky

2010

Journal of Heterocyclic Chem

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Section: Reactions Of Carbohydrazidesmentioning

confidence: 99%

Chemistry and heterocyclization of carbohydrazides

Hassan

Shawky

2010

Journal of Heterocyclic Chem

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“…As a consequence, research on aromatic polyimides with heterocycles in the main chain is widespread in scientific literature. [16][17][18][19][20] The incorporation of thermally stable groups such as aromatic or heterocyclic rings into polymer main chain is an effective approach to improve the thermal properties of polymers. The combination of above effective factors i.e., incorporation of heteroaromatic rings, pendent substituent and flexible linkages, with each other may be proposed as suitable choice for increasing the processability of aromatic polymers without extreme loss of thermal resistance.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of heat-resistant and soluble poly(amide-imide)s from unsymmetrical dicarboxylic acid containing 2-(triphenyl phosphoranylidene) moiety and various aromatic diamines

Agrawal

Narula

2015

J Chem Sci

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An unsymmetrical and non-coplaner heterocyclic phosphorus containing dicarboxylic acid monomer, (DCA-3) is successfully synthesized with high purity. A series of novel aromatic poly(amide-imide)s having ether or/sulphur or/fluorine or/phosphorus containing phenyl moieties in their backbone are then prepared via a direct phosphorylation polycondensation of synthesized dicarboxylic acid with various aromatic diamines. Chemical structures of DCA-3 as well as resulting polymers are confirmed by FT-IR, NMR spectroscopic techniques and elemental analysis. These polymers are readily soluble in a variety of aprotic polar solvents such as NMP, DMSO, DMAc and DMF, etc. UV spectra showed that all poy(amide-imide)s films exhibit high optical transparency. In addition, the glass transition temperatures (T g ) of these polymers were determined by differential scanning calorimetry and found in the range 271-346 • C. Furthermore, thermogravimetric analysis of these polymers showed good thermal stability, 10% weight loss at temperature in excess of 538 • C and char yield at 700 • C in nitrogen ranging from 68 to 79%. From wide-angle X-ray diffraction experiments, all polymers showed amorphous behaviour.

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“…PIs are one of the most successful classes of HPP and are widely used in industries. Nevertheless, processing difficulties encountered with them are due to their infusibility and poor solubility in organic solvents [19,20]. On the other hand, PAs possess exceptional mechanical properties and thermal stability; however, they are difficult to process because of restricted solubility and high glass transition (T g ) or melting temperatures because of chain rigidity and intermolecular hydrogen bonding between amide groups.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Poly(Amide-Imide)s Bearing a S-Valine Moiety in Molten Ionic Liquid

Mallakpour

Khania

2011

Designed Monomers and Polymers

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A study has been conducted to synthesize highly organosoluble and optically active poly(amide-imide)s via direct solution polycondensation of different aliphatic and aromatic diisocyanates with a chiral diacid monomer in the presence of molten tetrabutylammonium bromide (TBuAmBr) as a molten ionic liquid, and was compared with polymerization in traditional solvents like N-methyl-2-pyrrolidone (NMP). The step-growth polymerization of N-trimellitylimido-S-valine (1) as an optically active monomer with 4,4 -methylenebis(phenyl isocyanate) (MDI) (2a) was carried out by four different methods in the presence of pyridine (Py), dibutyltin dilaurate (DBTDL), triethylamine (TEA) as a catalyst and without catalyst, respectively. In these solutions polycondensations amino acid was used as chiral inducing agent. The optimized method of MDI (2a) was used for the polymerization of hexamethylene diisocyanate (HDI) (2b), isophorone diisocyanate (IPDI) (2c) and tolylene-2,4-diisocyanate (TDI) (2d). The resulting polymers have inherent viscosities in the range of 0.15-0.87 dl/g and were characterized with FT-IR, 1 H-NMR, elemental and thermogravimetric analysis techniques. In comparison with conventional solvents, this approach exhibited smoothly higher inherent viscosities and comparative yields and thermal stability. This process is safe and green since toxic and volatile organic solvents such as NMP were eliminated. These polymers are optically active, thermally stable and soluble in amide-type solvents.

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Polyamide-imides bearing furan moieties. 1. Solution polycondensation of aromatic dianhydrydes with 2-furoic acid dihydrazides

Cited by 40 publications

References 15 publications

Chemistry and heterocyclization of carbohydrazides

Chemistry and heterocyclization of carbohydrazides

Synthesis and characterization of heat-resistant and soluble poly(amide-imide)s from unsymmetrical dicarboxylic acid containing 2-(triphenyl phosphoranylidene) moiety and various aromatic diamines

Synthesis and Characterization of Poly(Amide-Imide)s Bearing a S-Valine Moiety in Molten Ionic Liquid

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