Condensation polymerization of pyrogallol and benzaldehyde

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

ANGEWANDTE MAKROMOLEKULARE CHEMIE, cilt.235, ss.149-160, 1996 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 235
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1002/apmc.1996.052350113
  • Dergi Adı: ANGEWANDTE MAKROMOLEKULARE CHEMIE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.149-160
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

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.