CO2-blown nanocellular foams
Article first published online: 14 AUG 2014
Copyright © 2014 Wiley Periodicals, Inc.
Journal of Applied Polymer Science
Volume 131, Issue 23, December 5, 2014
How to Cite
2014), CO2-blown nanocellular foams. J. Appl. Polym. Sci., 131, 41293, doi: 10.1002/app.41293(
- Issue published online: 10 SEP 2014
- Article first published online: 14 AUG 2014
- Manuscript Accepted: 24 JUL 2014
- Manuscript Received: 29 MAY 2014
- nanostructured polymers;
- porous materials;
- thermal properties
Polymeric nanocellular foams are broadly defined as having cell size below one micron. However, it is only when cell size reaches 100 nm or less that unique thermal conductivity, dielectric constant, optical, or mechanical properties are expected due to gas confinement in the cells or polymer confinement in the cell walls. Producing such materials with low density by physical foaming with CO2 requires the controlled nucleation and growth of 1015−1016 cells/cm3. This is a formidable challenge that necessitates new foaming strategies. This review provides a description of processes, conditions, and polymer systems that have been employed over the past 15 years to achieve increasingly higher cell densities and expansion ratio, culminating with the recent development of low density nanofoams and of nanostructured polymers in which nucleation can be precisely controlled. Remaining barriers to scale-up are summarized. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41293.