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- Title
Optically active: microwave-assisted synthesis and characterization of l-lysine-derived poly (amide-imide)s.
- Authors
Alborzi, Ali; Zahmatkesh, Saeed; Zare, Karim; Sadeghi, Javad
- 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). These polymers have inherent viscosities in the range of 0.23-0.66 dl g, 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) 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 H NMR spectroscopy, elemental analysis, thermogravimetric analyses, DSC, inherent viscosity measurement and specific rotation.
- Subjects
POLYCONDENSATION; AMINO acid synthesis; LYSINE; POLYAMIDES; POLYIMIDES; GLASS transition temperature; THERMAL properties; POLYMERS; VISCOSITY
- Publication
Amino Acids, 2011, Vol 41, Issue 2, p485
- ISSN
0939-4451
- Publication type
Article
- DOI
10.1007/s00726-010-0767-0