Rigid Poly(furfuryl alcohol) Networks: Swelling and Thermal Behaviour
1Iran Polymer and Petrochemical Institute, P.O.Box 14965/115, Tehran, Iran.
2Iran Polymer and Petrochemical Institute (IPPI), Tehran, Iran
3Iran Polymer and Petrochemical Institute (IPPI), PO Box 14965-115, Tehran, Iran
Polyfurfuryl alcohol (PFA), a low-molecular weight resin having a conjugated structure was crosslinked in the presence of various concentrations of oxalic, succinic and adipic acids (OX, SU and AD) as curing catalysts to yield a rigid network structure. Dynamic swelling studies were performed using different solvents to determine the most appropriate solvent for equilibrium swelling studies. Using Peppas-Lucht equation, network characteristics like average molecular weight between crosslinks (M̄c), crosslinking density (ρx) and polymer-solvent interaction parameter (χ) were determined after equilibrium swelling studies of the networks in acetonitrile as a solvent. Gel fraction of the networks was determined by Soxhlet extraction. Thermal stability of the networks were also studied at high temperatres. The values of ρx supported the high rigidity and degree of crosslinking of PFA resin in the presence of OX. Thermal stability studies showed no significant differences between the compositions, up to 900ºC.