Effect of silica nucleants on the rates of crystallization of poly(ethylene terephthalate) – Studies of the crystallization of poly(ethylene terephthalate) (PET) by d.s.c., both isothermally and non-isothermally – Silica nucleants crystallization polyethylene terephthalate

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Effect of silica nucleants on the rates of crystallization of poly(ethylene terephthalate)

Abstract

Silica nucleants crystallization polyethylene terephthalateStudies of the crystallization of poly(ethylene terephthalate) (PET) by d.s.c., both isothermally and non-isothermally, show that the addition of silica causes marked increases in rate at loadings < 1 part filler in 100 parts polymer.

At higher loadings the overall rate of crystallization decreases until it becomes less than that of un-nucleated PET.

Modified silica, with an alkoxy-coated surface, causes similar but less pronounced changes in rate.

The retardation in rate inspite of an increase in the number of spherulites is attributed to an increase in the viscosity of the polymer melt due to strong adsorption onto the silica particles.

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