کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1396219 | 984168 | 2009 | 8 صفحه PDF | دانلود رایگان |
In this contribution we report on the preparation of thermally responsive supramolecular gels obtained through self-assembling of metallo-organic polymers of lipophilic Fe(II) complexes of 1,2,4-triazole functionalized with octadecyl chains ([Fe(II) (4-octadecyl-1,2,4-triazole)3(ClO4)2]n) in three organic solvents: toluene, cis-decalin and trans-decalin. A gel phase is formed in these solvents by cooling the homogeneous complex solutions below a well-defined temperature, the so-called gelation threshold. These gels are reversible as they form homogeneous solutions upon heating above the melting temperature. The systems have been characterized for their thermal and viscoelastic properties through differential scanning calorimetry and rheological experiments, respectively. The effect of the solvent type and concentration on the gelation behaviour of the metallo-organic polymer has been analysed. The results obtained point to structural differences and different gelation mechanisms for the gels prepared in different solvents and they also suggest the possibility to control the spin-crossover transition temperature associated to the sol–gel transition.
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Journal: European Polymer Journal - Volume 45, Issue 12, December 2009, Pages 3339–3346