Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based Additive
Low thermal conductivity and adequate mechanical strength are desired for extruded polystyrene foams when they are applied as insulation materials. In this study, we improved the thermal insulation behavior and mechanical properties of extruded polystyrene foams through morphology control with the f...
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doaj-844fe16048c54079b94bcadb73b672022020-11-25T01:01:11ZengMDPI AGPolymers2073-43602019-02-0111226810.3390/polym11020268polym11020268Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based AdditiveMerve Aksit0Chunjing Zhao1Bastian Klose2Klaus Kreger3Hans-Werner Schmidt4Volker Altstädt5Department of Polymer Engineering, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, GermanyDepartment of Polymer Engineering, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, GermanyMacromolecular Chemistry I, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, GermanyMacromolecular Chemistry I, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, GermanyMacromolecular Chemistry I, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, GermanyDepartment of Polymer Engineering, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, GermanyLow thermal conductivity and adequate mechanical strength are desired for extruded polystyrene foams when they are applied as insulation materials. In this study, we improved the thermal insulation behavior and mechanical properties of extruded polystyrene foams through morphology control with the foam nucleating agent 1,3,5-benzene-trisamide. Furthermore, the structure⁻property relationships of extruded polystyrene foams were established. Extruded polystyrene foams with selected concentrations of benzene-trisamide were used to evaluate the influence of cell size and foam density on the thermal conductivity. It was shown that the addition of benzene-trisamide reduces the thermal conductivity by up to 17%. An increase in foam density led to a higher compression modulus of the foams. With 0.2 wt % benzene-trisamide, the compression modulus increased by a factor of 4 from 11.7 ± 2.7 MPa for the neat polystyrene (PS) to 46.3 ± 4.3 MPa with 0.2 wt % benzene-trisamide. The increase in modulus was found to follow a power law relationship with respect to the foam density. Furthermore, the compression moduli were normalized by the foam density in order to evaluate the effect of benzene-trisamide alone. A 0.2 wt % benzene-trisamide increased the normalized compression modulus by about 23%, which could be attributed to the additional stress contribution of nanofibers, and might also retard the face stretching and edge bending of the foams.https://www.mdpi.com/2073-4360/11/2/268polystyrene foams1,3,5-benzene-trisamidescell nucleationfoam extrusionfoam morphologysupramolecular additivesthermal insulationcompression properties |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Merve Aksit Chunjing Zhao Bastian Klose Klaus Kreger Hans-Werner Schmidt Volker Altstädt |
spellingShingle |
Merve Aksit Chunjing Zhao Bastian Klose Klaus Kreger Hans-Werner Schmidt Volker Altstädt Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based Additive Polymers polystyrene foams 1,3,5-benzene-trisamides cell nucleation foam extrusion foam morphology supramolecular additives thermal insulation compression properties |
author_facet |
Merve Aksit Chunjing Zhao Bastian Klose Klaus Kreger Hans-Werner Schmidt Volker Altstädt |
author_sort |
Merve Aksit |
title |
Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based Additive |
title_short |
Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based Additive |
title_full |
Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based Additive |
title_fullStr |
Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based Additive |
title_full_unstemmed |
Extruded Polystyrene Foams with Enhanced Insulation and Mechanical Properties by a Benzene-Trisamide-Based Additive |
title_sort |
extruded polystyrene foams with enhanced insulation and mechanical properties by a benzene-trisamide-based additive |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2019-02-01 |
description |
Low thermal conductivity and adequate mechanical strength are desired for extruded polystyrene foams when they are applied as insulation materials. In this study, we improved the thermal insulation behavior and mechanical properties of extruded polystyrene foams through morphology control with the foam nucleating agent 1,3,5-benzene-trisamide. Furthermore, the structure⁻property relationships of extruded polystyrene foams were established. Extruded polystyrene foams with selected concentrations of benzene-trisamide were used to evaluate the influence of cell size and foam density on the thermal conductivity. It was shown that the addition of benzene-trisamide reduces the thermal conductivity by up to 17%. An increase in foam density led to a higher compression modulus of the foams. With 0.2 wt % benzene-trisamide, the compression modulus increased by a factor of 4 from 11.7 ± 2.7 MPa for the neat polystyrene (PS) to 46.3 ± 4.3 MPa with 0.2 wt % benzene-trisamide. The increase in modulus was found to follow a power law relationship with respect to the foam density. Furthermore, the compression moduli were normalized by the foam density in order to evaluate the effect of benzene-trisamide alone. A 0.2 wt % benzene-trisamide increased the normalized compression modulus by about 23%, which could be attributed to the additional stress contribution of nanofibers, and might also retard the face stretching and edge bending of the foams. |
topic |
polystyrene foams 1,3,5-benzene-trisamides cell nucleation foam extrusion foam morphology supramolecular additives thermal insulation compression properties |
url |
https://www.mdpi.com/2073-4360/11/2/268 |
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