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Aligned-porous-structured poly(vinyl alcohol) foams with cellulose nanocrystals
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Learning Institute, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand;Nanotec-KMUTT Center of Excellence on Hybrid Nanomaterials for Alternative Energy, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Fibre and Particle Engineering, University of Oulu, Oulu, Finland.ORCID iD: 0000-0003-4762-2854
2018 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2018, Vol. 2010, article id 020007Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018. Vol. 2010, article id 020007
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-72059DOI: 10.1063/1.5053183ISI: 000460935000007Scopus ID: 2-s2.0-85054337136OAI: oai:DiVA.org:ltu-72059DiVA, id: diva2:1271232
Conference
2nd International Conference on Science and Technology of Emerging Materials 2018, STEMa 2018, Pattaya, Chonburi, Thailand, 18 July-20 July 2018
Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2019-04-12Bibliographically approved

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Tanpichai, SupachokOksman, Kristiina

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