Modeling foam growth in semi-crystalline thermoplastics
The accurate description of the rapidly changing viscoelastic character of the gas-laden polymer melt during the expansion phase of foam development is one of the main challenges in modeling thermoplastic foam processing. A general model addressing this challenge for amorphous and semi-crystalline p...
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| Veröffentlicht in: | Cellular polymers 2002-01, Vol.21 (2), p.99-116 |
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| container_title | Cellular polymers |
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| creator | DEN DOELDER, C. F. J SAMMLER, R. L KOOPMANS, R. J PAQUET, A. N |
| description | The accurate description of the rapidly changing viscoelastic character of the gas-laden polymer melt during the expansion phase of foam development is one of the main challenges in modeling thermoplastic foam processing. A general model addressing this challenge for amorphous and semi-crystalline polymers is presented here. Key model elements include the capturing of strain hardening in extensional flow and flow-induced crystallization. The extensional rheology is modeled using the Lodge constitutive equation. The crystallization is modeled using the Avrami equation enhanced with a flow-induced Jay-factor. The model is applied to two isotactic polypropylene materials. The results show the complex non-linearity of foam expansion. The calculated foaming window is in good agreement with experimental data. |
| doi_str_mv | 10.1177/026248930202100201 |
| format | Article |
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| ispartof | Cellular polymers, 2002-01, Vol.21 (2), p.99-116 |
| issn | 0262-4893 1478-2421 |
| language | eng |
| recordid | cdi_crossref_primary_10_1177_026248930202100201 |
| source | SAGE Complete A-Z List |
| subjects | Applied sciences Cellular Exact sciences and technology Forms of application and semi-finished materials Polymer industry, paints, wood Technology of polymers |
| title | Modeling foam growth in semi-crystalline thermoplastics |
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