Advances in Foamed Polymers

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 2874

Special Issue Editor


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Guest Editor
Mechanical Engineering Department, San Diego State University, San Diego, CA, USA
Interests: mechanics of nontraditional materials; polymers; composites; multiferroic; experimental mechanics

Special Issue Information

Dear Colleagues,

Polymeric foams continue to be an important class of materials, achieving remarkable progress in several areas such as sports gear, automotive, orthopedics, etc. Nonetheless, new advances are continuously reported in the synthesis, characterization, modeling, optimization, and integration of polymeric foams to increase and improve their utility. Such advances extend from basic to applied research domains.

The microstructure–processing–properties nexus of polymeric foams continues to be defined in the case of hierarchical microstructure, advanced auxetic cellular structures, tailorable properties, additive and green manufacturing, and scalable processing. These areas of research, and more, emphasize improving the properties (static and dynamic mechanical, thermal, transport, etc.) to achieve new levels of protection in personal and structural armors.

This Special Issue of Applied Sciences, "Advances in Foamed Polymers" seeks to attract a trans-disciplinary readership by covering the recent progress in:

- Novel methods in the synthesis, fabrication, and characterization of polymeric foams over a broad range of spatial and temporal scales;

- Analytical and computational modeling of mono-density, density-graded, and functionally-graded polymeric foams;

- Innovative applications of polymeric foams and their derivatives;

- Systematic methodologies for the optimization and development of foam-based structures for impact mitigation.

Prof. George Youssef
Guest Editor

Manuscript Submission Information

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Keywords

  • polymeric foams in applications (sports, orthopedics, automotive crashworthiness, aerospace, etc.)
  • auxetic polymeric foams
  • rigid foams
  • elastomeric foams
  • hierarchical microstructured foams
  • advanced manufacturing of polymeric foams
  • modeling of monolayer and multilayered foam structures
  • mechanical and environmental characterization
  • impact mitigation

Published Papers (1 paper)

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Research

12 pages, 2696 KiB  
Article
Partially-Perforated Self-Reinforced Polyurea Foams
by Sophia Do, Nha Uyen Huynh, Nathan Reed, Atif Mohammad Shaik, Somer Nacy and George Youssef
Appl. Sci. 2020, 10(17), 5869; https://0-doi-org.brum.beds.ac.uk/10.3390/app10175869 - 25 Aug 2020
Cited by 14 | Viewed by 2343
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Advances in Foamed Polymers)
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