Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films

Minna Hakalahti, Arto Salminen, Jukka Seppälä, Tekla Tammelin, Tuomas A. Hanninen

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Hygroscopic nature of cellulose is one of the most difficult limiting factors to overcome in utilization of nanocellulose. When unmodified nanocellulose structure is subjected to humidity or immersed in water it loses its structural integrity very quickly. Nanoscaled cellulose fibrils form very tightly packed films, which can be used, for example, as excellent barriers or membranes. Water stability of nanocellulose films has been improved by prepn. of multilayered structures, redn. of free vol., surface modification and additives. Polyvinyl alc. (PVA) can be used to significantly enhance water stability of films prepd. from TEMPO oxidized cellulose nanofibrils (TOCNs). In water swollen TOCN films, PVA has two functions; it can either improve the wet strength by forming interfibrillar bridges or act as a plasticizer. The interfibrillar bridging is result of two mechanisms: 1) hemiacetal bonding between PVA hydroxyls and aldehydes in TOCNs and 2) acid catalyzed formation of ester bonds between PVA hydroxyls and carboxylic groups in TOCNs. Sufficient bonding between TOCNs to achieve water stability could not be obsd. Mech. properties of the films can be tuned without losing the water stability merely by changing the amt. of PVA. Even after being immersed in water for several months, TOCN/PVA films maintain their structural integrity. The water stability increases to such extent that TOCN/PVA films can be used as water filtration membranes.
Original languageEnglish
Title of host publicationAbstracts of papers
PublisherAmerican Chemical Society ACS
PagesCELL-203
Publication statusPublished - 2015
Event249th ACS National Meeting and Exposition - Denver, United States
Duration: 22 Mar 201526 Mar 2015

Seminar

Seminar249th ACS National Meeting and Exposition
CountryUnited States
CityDenver
Period22/03/1526/03/15

Fingerprint

nanofibers
films (materials)
cellulose
water
vinyl compounds
plasticizers
aldehydes
humidity
esters

Cite this

Hakalahti, M., Salminen, A., Seppälä, J., Tammelin, T., & Hanninen, T. A. (2015). Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films. In Abstracts of papers (pp. CELL-203). American Chemical Society ACS.
Hakalahti, Minna ; Salminen, Arto ; Seppälä, Jukka ; Tammelin, Tekla ; Hanninen, Tuomas A. / Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films. Abstracts of papers. American Chemical Society ACS, 2015. pp. CELL-203
@inbook{08c65be1d7b042dfaab7daae33c86668,
title = "Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films",
abstract = "Hygroscopic nature of cellulose is one of the most difficult limiting factors to overcome in utilization of nanocellulose. When unmodified nanocellulose structure is subjected to humidity or immersed in water it loses its structural integrity very quickly. Nanoscaled cellulose fibrils form very tightly packed films, which can be used, for example, as excellent barriers or membranes. Water stability of nanocellulose films has been improved by prepn. of multilayered structures, redn. of free vol., surface modification and additives. Polyvinyl alc. (PVA) can be used to significantly enhance water stability of films prepd. from TEMPO oxidized cellulose nanofibrils (TOCNs). In water swollen TOCN films, PVA has two functions; it can either improve the wet strength by forming interfibrillar bridges or act as a plasticizer. The interfibrillar bridging is result of two mechanisms: 1) hemiacetal bonding between PVA hydroxyls and aldehydes in TOCNs and 2) acid catalyzed formation of ester bonds between PVA hydroxyls and carboxylic groups in TOCNs. Sufficient bonding between TOCNs to achieve water stability could not be obsd. Mech. properties of the films can be tuned without losing the water stability merely by changing the amt. of PVA. Even after being immersed in water for several months, TOCN/PVA films maintain their structural integrity. The water stability increases to such extent that TOCN/PVA films can be used as water filtration membranes.",
author = "Minna Hakalahti and Arto Salminen and Jukka Sepp{\"a}l{\"a} and Tekla Tammelin and Hanninen, {Tuomas A.}",
year = "2015",
language = "English",
pages = "CELL--203",
booktitle = "Abstracts of papers",
publisher = "American Chemical Society ACS",
address = "United States",

}

Hakalahti, M, Salminen, A, Seppälä, J, Tammelin, T & Hanninen, TA 2015, Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films. in Abstracts of papers. American Chemical Society ACS, pp. CELL-203, 249th ACS National Meeting and Exposition, Denver, United States, 22/03/15.

Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films. / Hakalahti, Minna; Salminen, Arto; Seppälä, Jukka; Tammelin, Tekla; Hanninen, Tuomas A.

Abstracts of papers. American Chemical Society ACS, 2015. p. CELL-203.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

TY - CHAP

T1 - Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films

AU - Hakalahti, Minna

AU - Salminen, Arto

AU - Seppälä, Jukka

AU - Tammelin, Tekla

AU - Hanninen, Tuomas A.

PY - 2015

Y1 - 2015

N2 - Hygroscopic nature of cellulose is one of the most difficult limiting factors to overcome in utilization of nanocellulose. When unmodified nanocellulose structure is subjected to humidity or immersed in water it loses its structural integrity very quickly. Nanoscaled cellulose fibrils form very tightly packed films, which can be used, for example, as excellent barriers or membranes. Water stability of nanocellulose films has been improved by prepn. of multilayered structures, redn. of free vol., surface modification and additives. Polyvinyl alc. (PVA) can be used to significantly enhance water stability of films prepd. from TEMPO oxidized cellulose nanofibrils (TOCNs). In water swollen TOCN films, PVA has two functions; it can either improve the wet strength by forming interfibrillar bridges or act as a plasticizer. The interfibrillar bridging is result of two mechanisms: 1) hemiacetal bonding between PVA hydroxyls and aldehydes in TOCNs and 2) acid catalyzed formation of ester bonds between PVA hydroxyls and carboxylic groups in TOCNs. Sufficient bonding between TOCNs to achieve water stability could not be obsd. Mech. properties of the films can be tuned without losing the water stability merely by changing the amt. of PVA. Even after being immersed in water for several months, TOCN/PVA films maintain their structural integrity. The water stability increases to such extent that TOCN/PVA films can be used as water filtration membranes.

AB - Hygroscopic nature of cellulose is one of the most difficult limiting factors to overcome in utilization of nanocellulose. When unmodified nanocellulose structure is subjected to humidity or immersed in water it loses its structural integrity very quickly. Nanoscaled cellulose fibrils form very tightly packed films, which can be used, for example, as excellent barriers or membranes. Water stability of nanocellulose films has been improved by prepn. of multilayered structures, redn. of free vol., surface modification and additives. Polyvinyl alc. (PVA) can be used to significantly enhance water stability of films prepd. from TEMPO oxidized cellulose nanofibrils (TOCNs). In water swollen TOCN films, PVA has two functions; it can either improve the wet strength by forming interfibrillar bridges or act as a plasticizer. The interfibrillar bridging is result of two mechanisms: 1) hemiacetal bonding between PVA hydroxyls and aldehydes in TOCNs and 2) acid catalyzed formation of ester bonds between PVA hydroxyls and carboxylic groups in TOCNs. Sufficient bonding between TOCNs to achieve water stability could not be obsd. Mech. properties of the films can be tuned without losing the water stability merely by changing the amt. of PVA. Even after being immersed in water for several months, TOCN/PVA films maintain their structural integrity. The water stability increases to such extent that TOCN/PVA films can be used as water filtration membranes.

M3 - Conference abstract in proceedings

SP - CELL-203

BT - Abstracts of papers

PB - American Chemical Society ACS

ER -

Hakalahti M, Salminen A, Seppälä J, Tammelin T, Hanninen TA. Customizing the mechanical performance of water stable TEMPO oxidized cellulose nanofibril films. In Abstracts of papers. American Chemical Society ACS. 2015. p. CELL-203