Aligned-porous-structured poly(vinyl alcohol) foams with cellulose nanocrystals
|Author:||Tanpichai, Supachok1,2,3; Oksman, Kristiina3,4|
1Learning Institute, King Mongkut’s University of Technology Thonburi
2Nanotec-KMUTT Center of Excellence on Hybrid Nanomaterials for Alternative Energy, King Mongkut’s University of Technology Thonburi
3Division of Materials Science, Luleå University of Technology
4Fibre and Particle Engineering, University of Oulu
|Online Access:||PDF Full Text (PDF, 0.7 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe201903067255
|Publish Date:|| 2019-03-06
Poly(vinyl alcohol) (PVA) foams were prepared using a green lyophilization process without the use of foaming agents. PVA solutions with contents of CNCs (1–4 wt%) were prepared at two different freezing temperatures (−20 and −186 °C). With the addition of CNCs, moisture uptake of the CNC-PVA foams prepared at two freezing temperatures was lower than the neat PVA foams. With increasing CNC contents, no significant change of the moisture uptake could be observed for both types of the foams. Similar values of the moisture uptake could be found from both foams frozen at −20 and −186 °C. Scanning electron microscope measurements revealed the aligned-porous-structure of the foams frozen at −186 °C along with the ice growth direction while large and elongated pores were observed from the foams with the lower freezing temperature. These unique features of the foams prepared by a freeze-drying technique could be controlled by changing the freezing temperature, and these foams could be useful for specific applications such as tissue engineering scaffolds, thermal insulators or filters.
AIP conference proceedings
|Type of Publication:||
A4 Article in conference proceedings
|Field of Science:||
216 Materials engineering
The authors would like to thank the Kempe Foundation for financial support.
© 2018 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in AIP Conference Proceedings, 2010 (1), 020007 and may be found at https://doi.org/10.1063/1.5053183.