Liquid Silicone Rubber Foamed with Thermoplastic Expandable Microspheres

To reduce the material costs as well as the density of Liquid Silicone Rubber (LSR), LSR foams can be produced in an injection molding process. Expandable thermoplastic microspheres can be used as blowing agents. This publication deals with the analysis of the cell structure of these LSR foams. For...

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Bibliographic Details
Published in:Materials 2022-05, Vol.15 (11), p.3779
Main Authors: Marl, Svenja, Giesen, Ralf-Urs, Heim, Hans-Peter
Format: Article
Language:English
Subjects:
Blowing agents
Carbon
Density
Disks
Gases
Injection molding
Investigations
Microspheres
Nitrogen
Plastic foam
Process controls
Rubber
Scanning electron microscopy
Silicone resins
Silicone rubber
Silicones
Tensile strength
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Summary:To reduce the material costs as well as the density of Liquid Silicone Rubber (LSR), LSR foams can be produced in an injection molding process. Expandable thermoplastic microspheres can be used as blowing agents. This publication deals with the analysis of the cell structure of these LSR foams. For this purpose, cylindrical disks are injection molded and examined for their cell structure as a function of different proportions of microspheres using a scanning electron spectroscope. In addition, the density of the samples is determined. It was found that a very homogeneous cell structure is produced in this process, that heat transport has a significant influence on the expansion of the microspheres, and that the formation of a filler network limits the expansion at higher proportions of blowing agent.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15113779