High-temperature degradation of polyacrylic acid in aqueous solution


GÜRKAYNAK M. A. , Tubert F., Yang J., Matyas J., Spencer J., Gryte C.

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, cilt.34, ss.349-355, 1996 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 34 Konu: 3
  • Basım Tarihi: 1996
  • Dergi Adı: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
  • Sayfa Sayıları: ss.349-355

Özet

Poly(acrylic acid) (PAA) was decarboxylated in aqueous solution as a function of pH and ionic strength in the temperature range 100-350 degrees C. Degradation kinetics were first order with respect to acid functionality. The rate of decarboxylation at high pH (E(a) = 51.1 kcal/ mol) was much slower than that at low pH (E(a) = 20.3 kcal/mol). At intermediate pH, the reactivity was found to depend on the degree of dissociation of PAA as a functions of ionic strength, pH, and temperature. No monomer was observed in the reaction product. (C) 1996 John Wiley & Sons, Inc.