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Kinked Bisamides as Efficient Supramolecular Foam Cell Nucleating Agents for Low-Density Polystyrene Foams with Homogeneous Microcellular Morphology

Title data

Klose, Bastian ; Kremer, Daniel ; Aksit, Merve ; van der Zwan, Kasper P. ; Kreger, Klaus ; Senker, Jürgen ; Altstädt, Volker ; Schmidt, Hans-Werner:
Kinked Bisamides as Efficient Supramolecular Foam Cell Nucleating Agents for Low-Density Polystyrene Foams with Homogeneous Microcellular Morphology.
In: Polymers. Vol. 13 (April 2021) Issue 7 . - No. 1094.
ISSN 2073-4360
DOI: https://doi.org/10.3390/polym13071094

Abstract in another language

Polystyrene foams have become more and more important owing to their lightweight potential and their insulation properties. Progress in this field is expected to be realized by foams featuring a microcellular morphology. However, large-scale processing of low-density foams with a closed-cell structure and volume expansion ratio of larger than 10, exhibiting a homogenous morphology with a mean cell size of approximately 10 mu m, remains challenging. Here, we report on a series of 4,4 `-diphenylmethane substituted bisamides, which we refer to as kinked bisamides, acting as efficient supramolecular foam cell nucleating agents for polystyrene. Self-assembly experiments from solution showed that these bisamides form supramolecular fibrillary or ribbon-like nanoobjects. These kinked bisamides can be dissolved at elevated temperatures in a large concentration range, forming dispersed nano-objects upon cooling. Batch foaming experiments using 1.0 wt.% of a selected kinked bisamide revealed that the mean cell size can be as low as 3.5 mu m. To demonstrate the applicability of kinked bisamides in a high-throughput continuous foam process, we performed foam extrusion. Using 0.5 wt.% of a kinked bisamide yielded polymer foams with a foam density of 71 kg/m(3) and a homogeneous microcellular morphology with cell sizes of approximate to 10 mu m, which is two orders of magnitude lower compared to the neat polystyrene reference foam with a comparable foam density.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000638778300001
Keywords: supramolecular additives; foam nucleating agents; batch foaming; foam extrusion; cell nucleation; low-density polymer foams; microcellular foams; foam morphology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III > Chair Inorganic Chemistry III - Univ.-Prof. Dr. Jürgen Senker
Research Institutions > Research Centres > Nordbayerisches Zentrum für NMR-Spektroskopie - NMR-Zentrum
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 540 Chemistry
Date Deposited: 08 Jun 2021 08:16
Last Modified: 08 Jun 2021 09:36
URI: https://eref.uni-bayreuth.de/id/eprint/65688