TY - JOUR
T1 - Vinylimidazole copolymers
T2 - coordination chemistry, solubility, and cross-linking as function of Cu2+ and Zn2+ complexation
AU - Andersson, Markus
AU - Hansson, Örjan
AU - Öhrström, Lars
AU - Idström, Alexander
AU - Nydén, Magnus
PY - 2011/8
Y1 - 2011/8
N2 - P(1-VIm-co-MMA) copolymers with 4 or 44 wt.% 1-VIm (abbreviated PVM-4 and PVM-44) where polymerized from 1-VIm (1-vinylimidazole) and methylmethacrylate with azobisisobutyronitrile as initiator and reacted with either Cu2+ or Zn2+. The resulting coordinated polymer complexes were studied using ICP-AES, CP/MAS 13C NMR, conductivity measurements, vibrational spectroscopy (mid-FTIR and far-FTIR), DSC, and EPR. It was established by ICP-AES, CP/MAS 13C NMR, conductivity, mid-FTIR and EPR measurements that the transition metal ions in the complexes were exclusively coordinated by the imidazole ligand. The coordination geometry is square planar with regard to Cu(II) complexes. The strong interaction between the polymeric imidazole ligand and the transition metal ion cross-links the system, resulting in augmentation of T g (the glass transition temperature), especially for copolymers with high relative amount of 1-VIm. The effect of changing metal ion is more complicated and depends on both the strength of the coordinate interaction as well as the coordination number. The solubility of the coordinate polymer complex in conventional solvents is low due to the coordinate cross-links. However, the coordinate polymer complexes are soluble in strongly coordinating solvents such as acetonitrile and dimethylsulfoxide. [Figure not available: see fulltext.]
AB - P(1-VIm-co-MMA) copolymers with 4 or 44 wt.% 1-VIm (abbreviated PVM-4 and PVM-44) where polymerized from 1-VIm (1-vinylimidazole) and methylmethacrylate with azobisisobutyronitrile as initiator and reacted with either Cu2+ or Zn2+. The resulting coordinated polymer complexes were studied using ICP-AES, CP/MAS 13C NMR, conductivity measurements, vibrational spectroscopy (mid-FTIR and far-FTIR), DSC, and EPR. It was established by ICP-AES, CP/MAS 13C NMR, conductivity, mid-FTIR and EPR measurements that the transition metal ions in the complexes were exclusively coordinated by the imidazole ligand. The coordination geometry is square planar with regard to Cu(II) complexes. The strong interaction between the polymeric imidazole ligand and the transition metal ion cross-links the system, resulting in augmentation of T g (the glass transition temperature), especially for copolymers with high relative amount of 1-VIm. The effect of changing metal ion is more complicated and depends on both the strength of the coordinate interaction as well as the coordination number. The solubility of the coordinate polymer complex in conventional solvents is low due to the coordinate cross-links. However, the coordinate polymer complexes are soluble in strongly coordinating solvents such as acetonitrile and dimethylsulfoxide. [Figure not available: see fulltext.]
KW - Coordinated polymer
KW - 1-vinylimidazole
KW - EPR
KW - DSC
KW - Glass transition temperature
KW - Vibrational spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=80052509400&partnerID=8YFLogxK
U2 - 10.1007/s00396-011-2461-5
DO - 10.1007/s00396-011-2461-5
M3 - Article
AN - SCOPUS:80052509400
VL - 289
SP - 1361
EP - 1372
JO - Colloid and Polymer Science
JF - Colloid and Polymer Science
SN - 0303-402X
IS - 12
ER -