Synthesis and characterization of new optically active poly(amide-imide)s derived from N,N?-(pyromellitoyl) bis-L-tyrosine and various diamines

• Autorzy: Khalaf H. I. , Wady A. N. , Daham H. K.
• Języki publikacji: EN

Abstrakty

EN

Five new optically active poly(amide-imide)s(PAIs) 5a - e were prepared by direct polycondensation reaction of N,N0 - (pyromellitoyl) bis-L-tyrosine 3 as chiral dicarboxylic acid with various aromatic diamines 4a - e. Triphenylphosphite(TPP)/pyridine(py) in the presence of calcium chloride (CaCl2) and N-methyl-2-pyrrolidone (NMP) were successfully applied to direct polycondensation reaction. The resulting new polymers were obtained in good yields with inherent viscosities ranging between 0.48 dL/g and 0.6 dL/g. They were analyzed with a C.H.N. elemental analyzer, FTIR, 1H-NMR, UV-VIS spectroscopy and polarimeter (speci?c rotation measurement, [a] 25 D ). Thermogravimetric analysis (TGA) indicated that the residual weight percentage of polymers at 600 °C were between 48.66 % and 64.21 %, which showed their thermal stability. These polymers are attractive to be used as packing materials in chromatography columns for separation of enantiomers.

Słowa kluczowe

EN

polycondensation; poly(amide-imide)s; optical activity

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2013
• Tom: Vol. 31, No. 1
• Strony: 43--51
• Opis fizyczny: Bibliogr. 30 poz., tab., wykr.

Twórcy

autor

Khalaf H. I.

autor

Wady A. N.

autor

Daham H. K.

• Polymer Research Unit, College of Science, Al-Mustansiryia University, Baghdad, Iraq

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