Poly(l‐lactide) and Its Cu(II) and Cr(III) Complexes

Abstract

The behavior of poly(L-lactide) (PLLA) complexes containing copper and chromium both in solution and in solid state was investigated by using viscometry, spectroscopy, thermogravimetry, and differential scanning calorimetry. The formation of these complexes leads to fluctuations in typical parameters such as viscosity and the Huggins and Kraemer constants due to conformational changes experienced by certain macromolecules with donor or acceptor groups in the presence of strongly loaded metallic ions. Crystallization temperatures fell considerably as the metallic complexes were formed; in other words, crystallization and its starting temperature were both reduced, although the complexes exhibited greater thermal stability. This affected the degradation characteristics of PLLA-metal complexes. The stretching vibrations of the ester group shifted to a lower frequency, which indicates the involvement of C O

Synthesis and Characterization of Polymer Metal Chelates Derived from Poly(2,2,3,3‐tetra methyleneaminecyclopropyl)phenyl Acrylate

“…The free radical initiator did not attack the cyclopropane ring during polymerization. Chemical structures of the poly‐(2,2,3,3‐tetracyanocyclopropyl)phenyl acrylate were determined by HNMR (Fig. b) and IR spectra (Fig.…”

“…1,2 Environmental contamination by heavy metal ions is a serious problem. 1,2 Environmental contamination by heavy metal ions is a serious problem.…”

“…In recent years, preparation of specific polymers either soluble or insoluble in water with various functional groups has been developed, which can adsorb metal ions in aqueous and nonaqueous media . Environmental contamination by heavy metal ions is a serious problem.…”