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- W2116979135 abstract "Pyromellitic dianhydride (1,2,4,5-benzenetetracarboxylic acid 1,2,4,5-dianhydide) was reacted with L-valine in a mixture of acetic acid and pyridine (3:2) at room temperature, and then was refluxed at 90–100 °C, N,N′-(pyromellitoyl)-bis-L-valine diacid was obtained in quantitative yield. The imide–acid was converted to N,N′-(pyromellitoyl)-bis-L-valine diacid chloride by reaction with thionyl chloride. Rapid and highly efficient synthesis of a number of poly(amide–imide)s was achieved under microwave irradiation using a domestic microwave oven by polycondensation of N,N′-(pyromellitoyl)-bis-L-valine diacid chloride with six different derivatives of 5,5-disubstituted hydantoin compounds in the presence of a small amount of a polar organic medium that acts as a primary microwave absorber. A suitable organic medium was o-cresol. The polycondensation proceeded rapidly, compared with conventional melt polycondensation and solution polycondensation and was almost completed within 8 min, giving a series of poly(amide–imide)s with inherent viscosities in the range 0.15–0.36 dl g−1. The resulting poly(amide–imide)s were obtained in high yield and are optically active and thermally stable. All of the above compounds were fully characterized by Fourier-transform infrared (FT-IR) spectroscopy, elemental analysis, inherent viscosity (ηinh) measurements, solubility testing and specific rotation measurements. The thermal properties of the poly(amide–imide)s were investigated by using thermogravimetric analysis. Copyright © 2004 Society of Chemical Industry" @default.
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- W2116979135 date "2004-07-28" @default.
- W2116979135 modified "2023-10-18" @default.
- W2116979135 title "Synthesis and characterization of novel optically active poly(amide–imide)s containingN,N′-(pyromellitoyl)-bis-L-valine diacid chloride and 5,5-disubstituted hydantoin derivatives under microwave irradiation" @default.
- W2116979135 doi "https://doi.org/10.1002/pi.1391" @default.
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