Synthesis and characterization of 1,4,8,11-tetraazacyclotetradecane carrying poly(p-chloromethyl styrene-ethylene glycol dimethacrylate) microbeads and its metal ion-chelated forms


Kavakli C. , Tuncel S., Salih B.

THERMOCHIMICA ACTA, cilt.398, ss.249-258, 2003 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 398
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1016/s0040-6031(02)00397-0
  • Dergi Adı: THERMOCHIMICA ACTA
  • Sayfa Sayıları: ss.249-258

Özet

Poly (p-chloromethyl styrene-ethylene glycol dimethacrylate) polymeric microbeads, poly (p-CM S-EGDMA), with an average size of 186 mum were synthesized by the suspension polymerization of p-CMS conducted in an aqueous medium. To increase the rigidity of the polymeric microbeads, EGDMA monomer was added to polymerization medium in the 25% for the cross-linking. 1,4,8,11-Tetraazacyclotetradecane ligand was reacted with polymer active groups that was p-CMS under a nitrogen atmosphere for 18 h at 65degreesC. The maximum cyclam attachment was found 2.24 mmol/g polymer using an elemental analyser. Fourier transform infrared (FT-IR) spectrophotometer, thermogravimetric analyser (TGA) and differential scanning calorimeter (DSC) were used to characterize the plain, ligand modified microbeads and metal ion-chelated microbeads. TGA and DSC characterization of modified microbeads showed that stability of cyclam was increased attaching onto the polymer and metal ion-chelated form of the cyclam-modified polymer were more stable at high temperature for different applications. (C) 2002 Elsevier Science B.V. All rights reserved.