Synthesis and Characterization of Processable Aromatic Polyimides

Polymer-Plastics Technology and Engineering

2014

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Two AB-type monomers 4-fluoro -N-(4-(2-(4-hydroxyphenyl) propan-2-yl) phenyl) benzamide and 4-fluoro -N-(5-hydroxy naphthyl) benzamide were synthesized. The AB-type poly(etheramide)s (PEAs) were derived by self-polymerization via the nucleophilic aromatic displacement reaction of AB-type monomers. The structure of AB-type monomers and PEAs were confirmed by FT-IR and H 1 -NMR spectroscopy. The PEAs were characterized by TGA, DSC, XRD, solution viscosity and solubility. X-ray diffraction studies indicated that the poly (ether-amide)s were amorphous. Poly(ether-amide)s exhibited excellent thermal stability and solubility. All the PEAs were readily soluble at room temperature in polar aprotic solvent DMSO, NMP and DMAc and also in less polar solvents such as m-cresol and pyridine.

Section: Experimental Materials and Instrumentsmentioning

confidence: 99%

Characterization of Thermally Stable AB-type Poly(ether-amide)s Derived from AB-type Monomers by Fluoro Displacement Reaction

Polymer-Plastics Technology and Engineering

2014

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“…The starting materials 4,4′-bis [(4″-aminophenylisopropylidene-4″′-phenoxy)]diphenyl sulfone and 4,4′-bis[(4″-aminophenylisopropylidene-4″′-phenoxy)]benzophenone were prepared in the laboratory starting from 4,4′-dichlorodiphenylsulfone and 4,4′-difluorobenzophenone respectively by the nucleophilic substitution reaction of 2-(4-aminophenyl)-2-(4′-hydroxyphenyl) propane as per the procedure reported in our previous publication [13].…”

Section: Synthesis Of Diacid Monomersmentioning

confidence: 99%

Synthesis of new diacid monomers and poly(amide-imide)s: study of structure–property relationship and applications

Vijayan

2012

J Polym Res

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Two diimide-diacid monomers 4,4′-bis[4″-(trimellitimido)phenyl isopropylidene-4″′-phenoxy]diphenyl sulfone and 4,4′-bis[4″-(trimellitimido)phenylisopropylidene-4″′-phenoxy] were synthesized. The structures of the monomers were characterized by FT-IR and 1 H-NMR spectroscopy. A series of novel poly(amide-imide)s were prepared from this two diacids and aromatic diamines through phosphorylation reaction. The PAIs were characterized by FT-IR, 1 H-NMR, XRD, TGA, and DSC, solution viscosity, solubility test and electrical properties. Poly(amide-imide)s showed excellent solubility due to the presence of flexible groups and isopropylidene unit in the polymer backbone. They also exhibited good thermal stability and the temperatures at which 10% weight loss occurred in the range 385-465°C. These PAIs found to have a dielectric constant in the range 3.25-4.20 at 10 kHz and have excellent electrical insulation character and can be used as insulation materials for electrical items operating at elevated temperatures.

“…Aromatic polyimides [1][2][3][4][5] are one of the most important classes of thermally stable/high performance polymers due to their excellent thermal, mechanical, and electrical properties. Polyimides are widely used in electrical, electronics, automotive, chemical, and aerospace industries [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and properties of novel diol monomers and processable thermally stable polyimides

2014

Colloid Polym Sci

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Diimide-diol monomers containing aliphatic spacer N,N′-bis (2-hydroxyethyl) biphenyl tetracarboxylic diimide and N,N′-bis(2-hydroxyethyl)benzophenone tetracarboxylic diimide were synthesized by a nucleophilic substitution reaction that involved ethanolamine and commercially available aromatic dianhydrides. The structures of the monomers were characterized by FT-IR and 1 H-NMR. Processable polyimides (PIs) containing aliphatic spacer were synthesized from these new diols and 4,4′-dichlorodiphenyl sulfone/4,4′-difluorobenzophenone by nucleophilic substitution reaction. The polyimides were characterized by FT-IR, 1 H-NMR, X-ray diffraction (XRD), thermogravimetry (TG), differential scanning calorimetry (DSC), solution viscosity, and solubility test. The X-ray diffraction patterns indicated that all these polyimides were amorphous and soluble in common organic solvents. Thermogravimetry analysis indicated that the polyimides exhibit good thermal stability, and 10 % weight loss occurred in the temperature range 375 to 429°C. The limited oxygen index (LOI) values of polyimides were in the range 36.3 to 37.5 and such PIs can be used as self extinguishing polymers.