Sodium montmorillonite intercalated with poly(ethylene glycol):a modifier of reactive hot-melt polyurethane adhesive

摘要

We have examined the effects of a sodium montmorillonite(Na-MMT)intercalated with poly(ethylene glycol)(PEG)on the properties of a reactive hot melt adhesive(RHA)based on polyurethane pre-polymer with terminal isocyanate groups.The bond strengths of the RHA,from the initial to final time period after application,were enhanced and the set time was reduced by the addition of 1-3 phr Na-MMT intercalated with PEG(Na-MMT/PEG).The modifier increased the viscosity and a pseudo-solid-like behavior at low shear rates when subjected to a dynamic shear stress.Further,both the tensile modulus and tensile strength of cured RHA films were improved by the reinforcing effect of Na-MMT.The X-ray diffraction pattern of RHA showed that the gallery of Na-MMT was intercalated with PEG segment.