Thermal stability of poly(2‐acrylamido‐2‐methylpropanesulphonic acid) and polymer complexes of 2‐acrylamido‐2‐methylpropanesulphonic acid with some transition metal salts

Abstract

Poly(2-acrylamido-2-methylpropanesulphonic acid) and polymer complexes of 2-acrylamido-2-methylpropanesulphonic acid with nickel(II), copper(I1) ,iron(III) chlorides and cobalt (11) sulphate, respectively, were prepared and characterized by spectroscopic techniques. Thermal stability of the formed polymer complexes was determined by means of thermogravimetric analysis. It was found that the thermal stability of the homopolymer is less than that of the polymer complexes. The activation energies of the degradation of the polymer complexes were determined by using the Arrhenius equation. Die thermische Stabilitat von Poly(2-ac1ylamido-2-methylpropansulfonsaure) und der polymeren Komplexe von 2-Acrylamido-2-methylpropansulfonsaure rnit einigen Salzen von UbergangsmetallenPoly(2-acrylamido-2-methylpropansulfonsaure) sowie polymere Komplexe von 2-Acrylamido-2-methylpropansulfonsaure mit Nickel(I1)-, Kupfer(I1)-, Eisen(II1)-chlorid und Kobalt(I1)sulfat wurden hergestellt und rnit spektroskopischen Methoden charakterisiert. Die thermische Stabilitat der gebildeten Polymerkomplexe wurde mittels thermogravimetrischer Analyse bestimmt. Es wurde festgestellt, daI3 die thermische Stabilitat des Homopolymers geringer ist als die der Polymerkomplexe. Die Aktivierungsenergy des Abbaus der Polymerkomplexe wurde mit der Arrhenius-Gleichung ermittelt.

Study of poly(acrylamide‐co‐2‐acrylamido‐2‐methylpropane sulfonic acid) hydrogels made using gamma radiation initiation

“…The IR spectra of the dried poly(AAM-co-AMPS) gels were very similar to those of the AAM-AMPS copolymers prepared by free-radical-initiated polymerization 9,31 and by initiation with a high-frequency discharge. 12 The FTIR spectrum of the gamma-initiated polyAMPS gel is shown in Figure 10, together with the spectra of free-radical-initiated polyAMPS, gammainitiated polyAAM gel, and poly(AAM-co-AMPS) gels at low-and high-radiation doses.…”

“…For free-radical-initiated copolymerization of (1) AAM and (2) AMPS, the monomer reactivity ratios r 1 ϭ 1.21, r 2 ϭ 0.62, 9 and r 1 ϭ 1.05, r 2 ϭ 0.42 3 have been reported. Both sets of reactivity ratios indicate that in a free-radical-initiated reaction, the copolymer first formed contains an excess of AAM units relative to the proportion of AAM in the pregel solution.…”

“…3 Hydrogels based on AMPS, synthesized using various methods, have been used in biochemistry, 1,4 for skin contact electrodes, 5 and to adhere medical devices to the skin or for drug delivery applications such as iontophoresis. 6 Although the free-radical-initiated copolymerization of AMPS and the swelling behavior and volume phase transition together with other properties of poly(AAM-co-AMPS) gels have been investigated, 3,[7][8][9][10][11][12] there have been few publications on gammaradiation-initiated copolymerization of AMPS with AAM. It has been reported that poly(AAM-co-AMPS) synthesized using ␥-radiation had a higher pure water absorbency but showed a large decrease in NaCl solution absorbency.…”

Encapsulation of diclofenac sodium with acidic copolymer hydrogels based on PEG/poly(N‐isopropylacrylamide‐co‐2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid) semi‐interpenetrating network using in situ loading technique

“…Because the decomposition temperatures for polymers of AMPS, NIPA, and PEG (AMPS $ 240 C, NIPA $ 420 C, and PEG $ 400 C, respectively) were well studied elsewhere 31,32 with the use of TGA, we performed the investigation on decomposition of the drug DFNa using TGA while we analyzed the general thermal behaviors of the prodrugs by using DSC. The data are given in Figure 1 and Table I.…”

Synthesis and Characterizations of Graft Copolymer of Ethylcellulose with Poly(caprolactone monoacrylate)

“…Shen 9 grafted EC with PS and PMMA. Aggour 10,11 reported radical graft reaction of EC. In this article, a novel graft copolymer was prepared by introducing flexible poly(caprolactone monoacrylate) (PCLA) chains onto EC backbone.…”