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Kinetic behaviour and thermo-mechanical properties of composites based on unsaturated polyester (UP) resin and organically modified clay (OMC) are completely dependent on their preparation procedure. The investigation on the preparation procedure of the UP/OMC suspensions under high shear conditions alone (shear rate= 4.86 10 4 s -1 ) without interference of chemical compatibility of OMC with UP resin on the intercalation and exfoliation processes has been the main aim of the present work. Reaction rate and degree of conversion of UP/3wt%OMC mixtures prepared at three mixing speeds of 1000, 3000 and 5000 rpm and several mixing times ranging from 15 min to 12 h showed an abnormal behaviour. The results showed a little decrease in the reaction rate and degree of conversion when mixing time increased from 1.5 h to 12 h at 1000 rpm, 1.5 h to 4.5 h at 3000 rpm and 30 min to 3 h at 5000 rpm. Thermo-mechanical properties of composites showed maximum values for storage modulus when plotted against the mixing time. Reaction rate, degree of conversion and morphology of UP/OMC composites indicated that cure reaction is affected by the extent of expansion of interlayer space of the OMC, the number of the expanded interlayer spaces per volume unit and the number of broken clay agglomerates.

e-polymers

A study on the kinetic behaviour and thermo-mechanical properties of nanoclay reinforced unsaturated polyester resin prepared under high shear conditions