Novel poly (arylene-ether-ether-ketone)s containing preformed imide unit and pendant long chain alkyl group

As a high-performance polymer, carboxylic-functionalized poly(arylene ether ketone)s (PCA-PAEK) was electrospun into ultrafine fibers and characterized. To optimize the process, a set of experiments were designed. As a result, the optimum condition was obtained and the polymer concentration was determined as the most important factor. Incidentally, the PCA-PAEK fibers were found to exhibit superabsorbent behavior. In order to investigate processing characteristics, PCA-PAEK fibers fabricated from different solution concentrations were employed and characterized. The results showed that porosity and changes in water contact angle and water absorbency decreased with an increase in concentration. In addition to a high water absorption capacity, the fibers exhibited good water retention and repeated water absorbency as well. The study on kinetics of water absorption and swelling behavior showed that the mechanism was dependent on the polymer concentration from which the fibers were electrospun. Moreover, both dry and wet PCA-PAEK fibers showed high mechanical properties. Due to these properties, the PCA-PAEK ultrafine fibers are potentially useful as a water-absorbent material.

Section: Introductionmentioning

confidence: 99%

Electrospun carboxylic-functionalized poly(arylene ether ketone) ultrafine fibers

Liu

Wang

Cheng

et al. 2015

“…FPIs (FPI-1 to FPI-8) were synthesized by nucleophilic substitution reaction. 19 –25 The typical procedure adopted for the synthesis of FPI-1 was as follows. Into a 100-mL round-bottomed flask fitted with a Dean–Stark trap, diol monomer IVa (0.01 mol), 30 mL of dry NMP, 20 mL of toluene and anhydrous potassium carbonate (0.022 mol) were added.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of diol monomers and organosoluble fluorinated polyimides with low dielectric

Saritha

Thiruvasagam

2015

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.

“…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

Thiruvasagam

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.