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

High Performance Polymers

2015

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Four diimide–diol monomers were synthesized from 4,4′-(hexafluoroisopropylidene)diphthalic dianhydride and aminophenol/aminonaphthol. The structures of the monomers were characterized by spectroscopic analysis. A series of fluorinated polyimides (FPI-1 to FPI-8) were synthesized from these new diols and 4,4′-difluorobenzophenone/4,4′-dichlorodiphenyl sulphone, through nucleophilic displacement reaction. The FPIs were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, X-ray diffraction, thermogravimetry, differential scanning calorimetry, solution viscosity, solubility test, and dielectric properties test. FPIs were amorphous and showed good solubility due to the presence of >C(CF3)2 unit and flexible groups in the polyimides backbone. These FPIs also showed good thermal stability and the 10% weight loss occurred in the range 353–505°C. The limiting oxygen index values of FPIs were in the range of 31.5–39.1 and such FPIs can be used as self-extinguishing polymers. These FPIs have a dielectric constant in the range of 3.10–4.23 and can be used as high temperature electrical insulation materials.

Section: Methodsmentioning

confidence: 99%

Synthesis of diol monomers and organosoluble fluorinated polyimides with low dielectric

Saritha

High Performance Polymers

2015

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“…All the PEIs were synthesized by the nucleophilic displacement reaction of diol (IIIa-d) and DFBP in the presence of weak base anhydrous K 2 CO 3 in NMP as shown in Figure 2. [19][20][21][22] The typical procedure adopted for the polymerization was as follows. To a round-botteomed flask, diol monomer IIIa (6.06 g, 0.01 mol), DFBP (2.18 g, 0.01 mol), 50 mL of dry NMP, and anhydrous K 2 CO 3 (3.04 g, 0.022 mol) were added.…”

Section: Peis Synthesismentioning

confidence: 99%

Poly(ether–imide)s with flexible linkages and kinks

High Performance Polymers

Saritha

Hari

2016

Four new aromatic diimide-diol monomers were synthesized from bisphenol A dianhydride and hydroxyamines. The poly(ether-imide)s (PEI-1 to PEI-4) were synthesized from these diols and 4,4 0 -difluorobenzophenone-IV via carbonylactivated aromatic nucleophilic fluoro displacement reaction. The chemical structures of the monomers and PEIs were confirmed by Fourier transform infrared spectrometer and proton nuclear magnetic resonance spectroscopies. The PEIs synthesized here were amorphous and soluble in polar aprotic solvents and low-boiling organic solvents. The PEIs had good thermal stability, 10% weight loss occurred in the temperatures range of 400-448 C, and char yields at 800 C under nitrogen atmosphere was in the range of 14-22%. The limiting oxygen index values of PEIs were in the range of 23.1-26.3, and such PEIs can be used as self-extinguishing polymers. The dielectric constants of the PEIs were in the range of 3.30-4.00, and such PEIs can be used as electrical insulation materials for systems operating at high temperature for long time.

“…The polyimides containing aliphatic spacer (PI-1 to PI-4) were synthesized by nucleophilic substitution reaction [17][18][19][20][21][22]. Typical procedure adopted for the synthesis of polyimide PI- , 30 mL of dry NMP, 20 mL of toluene, and anhydrous K 2 CO 3 (0.065 mol) were added.…”

Section: Synthesis Of Polyimidesmentioning

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.