Condensation polymerization of pyrogallol and benzaldehyde


Erbay E., Bilgic T., Uyanik N., Savasci O.

ANGEWANDTE MAKROMOLEKULARE CHEMIE, vol.235, pp.149-160, 1996 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 235
  • Publication Date: 1996
  • Doi Number: 10.1002/apmc.1996.052350113
  • Title of Journal : ANGEWANDTE MAKROMOLEKULARE CHEMIE
  • Page Numbers: pp.149-160

Abstract

Novolac-type polycondensation of benzaldehyde (B) and pyrogallol (P) has been carried out at 60 degrees C, 75 degrees C and 90 degrees C and at B/P mole ratios of 1.5 and 3.0 using phosphoric acid as catalyst. The reaction follows a 2nd order rate law. By using GC consumption data of benzaldehyde and pyrogallol, kinetic parameters such as the overall rate constants, activation energies (E(a)) and logA values are investigated. The activation energies for 1.5 and 3.0 B/P mole ratios are found as 62.3 kJ mol(-1) and 56.4 kJ mol(-1), respectively. The molecular weights of the resins determined by measuring intrinsic viscosities (25 degrees C, THF) are in the range of 0.03 to 0.07 dL g(-1) at various temperatures and B/P mole ratios.