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Rheologica Acta

, Volume 50, Issue 11–12, pp 909–915

First Online: 08 December 2010Received: 11 June 2010Revised: 24 September 2010Accepted: 11 November 2010

Abstract

A new suspension-based rheological method was applied to experimentally study the crystallization of a nucleating agent NA filled isotactic polypropylene. This method allows for determination of point nucleation densities where other methods fail. For example, optical microscopy can fail because nucleation densities become too high to be counted materials with effective NA or crystallites are not easily visible colored materials, while differential scanning calorimetry does not allow the effect of flow to be studied. Both quiescent and mild-shear-induced crystallization were investigated. The results show that the addition of a nucleating agent increases the nucleation density by six decades for quiescent crystallization. The effect of shear on crystallization in the presence of a nucleating agent was assessed, and it is demonstrated that, at least for this system, the effect of shear is much smaller than the effect of the nucleating agent.

KeywordsPolymer crystallization Nucleation Nucleating agent Shear Flow-induced crystallization Rheometry This paper was presented at the 6th Annual European Rheology Conference, April 7–9 2010, Göteborg, Sweden.

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Author: Zhe Ma - Rudi J. A. Steenbakkers - Julien Giboz - Gerrit W. M. Peters

Source: https://link.springer.com/







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