Ccm. Ma et al., INTERPENETRATING POLYMER NETWORKS OF POLYURETHANE AND FURFURYL ALCOHOL .2., Die Angewandte makromolekulare Chemie, 218, 1994, pp. 41-52
A feasibility study of pultrusion of fiber-reinforced polyurethane/fur
furyl alcohol (PU/FA) interpenetrating polymer/network IPN composites
has been made. From the viscosity study, it was found that the pot lif
e of the PU/FA IPN prepolymers increased with PU content and showed hi
gh reactivity at elevated temperature. It was confirmed from the morph
ological study that the wetting of fibers by the PU/FA IPN resins was
improved with PU content. The appearance of the tensile failure surfac
es of the pultruded glass fiber-reinforced PU/FA IPN composites showed
''hackle patterns'' for PU contents below 15 phr. The mechanical prop
erty study shows that the tensile strength of pultruded PU/FA IPN comp
osites is the highest when the PU content is 5 phr. However, the flexu
ral strength, flexural modulus and HDT decreased with PU content. The
mechanical properties of various fiber-reinforced (glass, carbon, and
Kevlar 49 aramid fiber) pultruded PU/FA IPN composites increased with
fiber volume content.