Effects of pressure drop rate and CO2 content on the foaming behavior of newly developed high-melt-strength polypropylene in continuous extrusion

Author:

Kim Eric1,Kweon Mu Sung1ORCID,Romero-Diez Sandra1,Gupta Anvit2,Yan Xuejia2,Spofford Caitlin2,Pehlert George2,Lee Patrick C1

Affiliation:

1. Multifunctional Composites Manufacturing Laboratory (MCML), Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Canada

2. ExxonMobil Chemical Company, Baytown, TX, USA

Abstract

We report systematic studies on the foamability of our novel high-melt-strength long-chain branched polypropylene under supercritical CO2. Continuous foaming experiments were conducted using a tandem extrusion system and a set of filamentary dies with similar pressure drops but different pressure drop rates. The foam expansion was controlled by varying the temperature at the die exit. Under identical CO2 loadings, the expansion ratio plotted as a function of die temperature exhibited similar shapes across multiple pressure drop rates. However, the shape of the curve varied across different amounts of CO2, under which the highest achievable expansion ratio occurred at a lower die temperature with increasing CO2 content. The cell density displayed strong dependence on both the pressure drop rate and the amount of dissolved CO2. The effect of the latter became more apparent at lower pressure drop rates. The average cell size decreased with increasing CO2 loading but generally showed weak dependence on pressure drop rate except at the highest value.

Funder

Natural Sciences and Engineering Research Council of Canada

Exxon Mobil Corporation

Publisher

SAGE Publications

Subject

Materials Chemistry,Polymers and Plastics,General Chemistry

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