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Nanofibrillated cel...
Nanofibrillated cellulose/nanographite composite films
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- Osong, Sinke Henshaw (författare)
- Mittuniversitetet,Avdelningen för kemiteknik
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- Dahlström, Christina (författare)
- Mittuniversitetet,Avdelningen för kemiteknik
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- Forsberg, Sven (författare)
- Mittuniversitetet,Avdelningen för naturvetenskap,Avdelningen för kemiteknik
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- Andres, Britta (författare)
- Mittuniversitetet,Avdelningen för naturvetenskap
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- Engstrand, Per (författare)
- Mittuniversitetet,Avdelningen för kemiteknik
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- Norgren, Sven (författare)
- Mittuniversitetet,Avdelningen för kemiteknik
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- Engström, Ann-Christine (författare)
- Mittuniversitetet,Avdelningen för naturvetenskap
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(creator_code:org_t)
- 2016-06-22
- 2016
- Engelska.
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Ingår i: Cellulose. - : Springer Science and Business Media LLC. - 0969-0239 .- 1572-882X. ; 23:4, s. 2487-2500
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Though research into nanofibrillated cellulose (NFC) has recently increased, few studies have considered co-utilising NFC and nanographite(NG) in composite films, and, it has, however been a challenge to use high-yield pulp fibres (mechanical pulps) to produce this nanofibrillar material. It is worth noting that there is a significant difference between chemical pulp fibres and high-yield pulp fibres, as the former is composed mainly of cellulose and has a yield of approximately 50 % while the latter is consist of cellulose, hemicellulose and lignin, and has a yield of approximately 90 %. NFC was produced by combining TEMPO (2,2,6,6-tetramethypiperidine-1-oxyl)-mediated oxidation with the mechanical shearing of chemi-thermomechanical pulp (CTMP) and sulphite pulp (SP); the NG was produced by mechanically exfoliating graphite. The different NaClO dosages in the TEMPO system differently oxidised the fibres, altering their fibrillation efficiency. NFC-NG films were produced by casting in a Petri dish. We examine the effect of NG on the sheet-resistance and mechanical properties of NFC films. Addition of 10 wt% NG to 90 wt% NFC of sample CC2 (5 mmol NaClO CTMP-NFC homogenised for 60 min) improved the sheet resistance, i.e. from that of an insulating pure NFC film to 180 Omega/sq. Further addition of 20 (CC3) and 25 wt% (CC4) of NG to 80 and 75 wt% respectively, lowered the sheet resistance to 17 and 9 Omega/sq, respectively. For the mechanical properties, we found that adding 10 wt% NG to 90 wt% NFC of sample HH2(5 mmol NaClO SP-NFC homogenised for 60 min) improved the tensile index by 28 %, tensile stiffness index by 20 %, and peak load by 28 %. The film's surface morphology was visualised using scanning electron microscopy, revealing the fibrillated structure of NFC and NG. This methodology yields NFC-NG films that are mechanically stable, bendable, and flexible.
Nyckelord
- Nanofibrillated cellulose
- Nanographite
- Nanocomposites
- TEMPO
- High-speed homogenisation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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