Optically active polymer: synthesis and characterization of new optically active poly (hydrazide-imide)s incorporating L- leucine

Abstract

This paper deals with the polycondensation between a chiral diacyl chloride (N,N′-Pyromelliticdiimido-di-L-leucine chloride) and six different dihydrazides. The corresponding poly (hydrazide-imide)s which have been obtained in quantitative yields are moderately soluble in polar aprotic solvents, have good thermal stability and optical activity. The synthetic compounds have been characterized by IR, UV and 1 H NMR spectroscopy, elemental analysis and specific rotation. The thermal properties of the polymers (10 and 15) have been studied by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC).

Research Progress on Synthesis and Application of Cyclodextrin Polymers

“…While single CD molecules can no longer meet the present practical application needs [ 3 , 4 , 5 ], the development of polymers has continued because of their excellent properties. They have become an important field of materials research and have brought new opportunities for CDs [ 6 , 7 , 8 , 9 ]. Studies involving CDs have demonstrated that they can also be used to form living polymers [ 10 , 11 , 12 ].…”

Synthesis and characterization of new optically active and organosoluble poly(ester-imide)s based on bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic diimide by direct polycondensation

“…However, these polymers are generally intractable and lack the properties essential for successful fabrication into useful forms because of their high melting or glass-transition temperatures and limited solubility in organic solvents [3]. One of the successful approaches to improving solubility is the incorporation of other functional groups, such as amide, ether, ester and siloxane linkages, along the polymer skeleton and, consequently, the preparation of the appropriate copolyimides [4][5][6][7][8][9][10][11][12].…”