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Partially-Perforated Self-Reinforced Polyurea Foams
- Source :
- Applied Sciences, Volume 10, Issue 17, Applied Sciences, Vol 10, Iss 5869, p 5869 (2020)
- Publication Year :
- 2020
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2020.
-
Abstract
- This paper reports the unique microstructure of polyurea foams that combines the advantages of open and closed cell polymeric foams, which were synthesized through a self-foaming process. The latter was the result of aggressive mechanical mixing of diamine curative, isocyanate, and deionized water at ambient conditions, which can be adjusted on-demand to produce variable density polyurea foam. The spherical, semi-closed microcellular structure has large perforations on the cell surface resulting from the concurrent expansion of neighboring cells and small holes at the bottom surface of the cells. This resulted in a partially perforated microcellular structure of polyurea foam. As a byproduct of the manufacturing process, polyurea microspheres nucleate and deposit on the inner cell walls of the foam, acting as a reinforcement. Since cell walls and the microspheres are made of polyurea, the resulting reinforcement effect overcomes the fundamental interfacial issue of different adjacent materials. The partially perforated, self-reinforced polyurea foam is compared to the performance of traditional counterparts in biomechanical impact scenarios. An analytical model was developed to explicate the stiffening effect associated with the reinforcing microspheres. The model results indicate that the reinforced microcell exhibited, on average, ~30% higher stiffness than its barren counterpart.
- Subjects :
- Materials science
Nucleation
Mixing (process engineering)
02 engineering and technology
lcsh:Technology
Self reinforced
lcsh:Chemistry
chemistry.chemical_compound
0203 mechanical engineering
medicine
General Materials Science
Composite material
lcsh:QH301-705.5
Instrumentation
Polyurea
perforated foam
Fluid Flow and Transfer Processes
lcsh:T
Process Chemistry and Technology
General Engineering
Stiffness
021001 nanoscience & nanotechnology
Microstructure
self-reinforced foam
Isocyanate
lcsh:QC1-999
Computer Science Applications
Stiffening
020303 mechanical engineering & transports
lcsh:Biology (General)
lcsh:QD1-999
chemistry
lcsh:TA1-2040
medicine.symptom
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
polyurea
lcsh:Physics
semi-closed cell
Subjects
Details
- Language :
- English
- ISSN :
- 20763417
- Database :
- OpenAIRE
- Journal :
- Applied Sciences
- Accession number :
- edsair.doi.dedup.....110bc12e915f84f12779f636822a6985
- Full Text :
- https://doi.org/10.3390/app10175869