Optically active: microwave-assisted synthesis and characterization of L-lysine-derived poly (amide-imide)s |
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Authors: | Alborzi Ali Reza Zahmatkesh Saeed Zare Karim Sadeghi Javad |
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Affiliation: | (1) Department of Chemistry, Islamic Azad University, Firouzabad, Fars, Iran;(2) Department of Science, Payame Noor University (PNU), Tehran, Iran; |
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Abstract: | l-lysine hydrochloride was transformed to ethyl l-lysine dihydrochloride. This salt was reacted with trimellitic anhydride to yield the corresponding diacid (1). Microwave-assisted polycondensation results a series of novel Poly (amide-imide)s (PAI a–i ). These polymers have inherent viscosities in the range of 0.23–0.66 dl g−1, display optical activity from +8.02 to +15.11 (as there is no obvious regioselectivity between alpha and epsilon amino groups of the chiral diacid during the polymerization step then random orientation of diacid moieties along the polymer backbone can be predicted and the concept of “tacticity” cannot be addressed in this research), and are readily soluble in polar aprotic solvents. They start to decompose (T 10%) above 362°C and display glass-transition temperatures at 119–153°C. All of the above polymers were fully characterized by UV, FT-IR and 1H NMR spectroscopy, elemental analysis, thermogravimetric analyses, DSC, inherent viscosity measurement and specific rotation. |
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