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Vinylimidazole copolymers: coordination chemistry, solubility, and cross-linking as function of Cu2+ and Zn2+ complexation

Markus Andersson (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Örjan Hansson ; Lars Öhrström (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; Alexander Idström (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Magnus Nydén (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials)
Colloid and Polymer Science (0303-402X). Vol. 289 (2011), 12, p. 1361-1372.
[Artikel, refereegranskad vetenskaplig]

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 Cu(2+) or Zn(2+). The resulting coordinated polymer complexes were studied using ICP-AES, CP/MAS (13)C NMR, conductivity measurements, vibrational spectroscopy (mid-FTIR and far-FTIR), DSC, and EPR. It was established by ICP-AES, CP/MAS (13)C 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.

Nyckelord: Coordinated polymer, 1-vinylimidazole, EPR, DSC, Glass transition, temperature, Vibrational spectroscopy, core/polymer shell microcapsules, internal phase-separation, metal-ions, poly(methyl methacrylate), imidazole complexes, spectra, cu(ii), field, raman, nmr



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Denna post skapades 2011-08-11. Senast ändrad 2016-03-23.
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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
SuMo Biomaterials
Institutionen för kemi (2001-2011)
Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Materialvetenskap
Koordinationskemi
Polymerkemi
Molekylär biofysik

Chalmers infrastruktur

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