عنوان به زبان ديگر :
Preparation of New Poly(ester-imide)s from N,Nי-(4,4י-Hexafluoroisopropyliden diphthaloyl)-bis-L-isoleucine and Aromatic Diols with TsClIPy/DMF as a Condensing Agent
چكيده لاتين :
4,4י-HexafluoroisoproPYlidene-2,2י-biS-(Phthalic acid anhydride) (1) was reacted with L-isoleucine (2) in acetic acid and the resulting N,Nי-(4,4י-hexafluoroisopropylidendiphthaloyl)-bis-L-isoleucine (3) was obtained in high yield. The direct polycondensation reaction of this diacid with several aromatic diols such as bisphenol A (4a), phenolphthalein (4b), 1,4-dihydroxybenzene (4c), 4,4י-dihydroxydiphenyl sulphide (4d), bisphenyl-2,2י-diol (4e) and 4,4י-dihydroxydiphenyl sulphone (41) and 2,6 dihydroxy toluene (4g) was carried out in a system of tosyl chloride (TsCI), pyridine (Py) and N,N-dimethylformamide (DMF). The reactions with TsCI were significantly promoted by controlling alcoholysis with diols in the presence of the catalytic amounts of DMF to give a series of optically active poly(ester-imide)s (PEI)s with good yield and moderate to high inherent viscosity ranging 0.35-0.66 dUg. The polycondensation reactions were significantly affected by the amounts of DMF, molar concentration of monomers, TsCI and Py, aging time, temperature and the reaction time. Some of the above polymers were fully characterized by 1H NMR, FTIR, elemental analysis and specific rotation. Some structural characterization and physical properties of these optically active PEls are reported.
