Effect of mild alkali/ultrasound treatment on flax and hemp fibres

the different responses of the two substrates

J. Borsa, K. László, Lydia Boguslavsky, E. Takács, I. Rácz, Tünde Tóth, Dávid Szabó

Research output: Article

4 Citations (Scopus)

Abstract

Flax and hemp fibres were treated by various combinations of water/diluted alkaline solution and stirring/ultrasound, respectively. Changes in the microstructure (scanning electron microscopy) and porous structure (low-temperature nitrogen adsorption), removal of non-cellulosic materials (weight loss, FTIR), mean fibre diameter, and adhesion of the polypropylene matrix to the fibres (micro-bond test) were investigated. For both types of fibres, removal of (FTIR) was observed. The fibre diameter of hemp was decreased by several treatments, most of all by stirring in alkali and subsequent sonication in water, while the ultrasound applied in alkali solution did not change the fibre fineness. This can be attributed to the dual effect of ultra-sonication: the swelling effect of alkali combined with ultrasound energy probably served the sticking of inter-fibrillar material rather than their dissolution. Fibre diameter of flax did not change in any circumstances. The porosity of hemp in the mesopore range increased, while that of flax decreased by alkali treatment and subsequent sonication. The reason for this difference might be the dissimilar cell wall structures of the two bast fibres, the high arabinose content of the hemp, and/or the cottonisation of hemp. No treatments altered the fibre-matrix adhesion measured by pulling out the fibre from a micro-droplet of polypropylene.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalCellulose
DOIs
Publication statusAccepted/In press - márc. 18 2016

Fingerprint

Hemp fibers
Flax
Alkalies
Ultrasonics
Hemp
Fibers
Substrates
Cannabis
Sonication
Polypropylenes
Adhesion
Bast fibers
Arabinose
Water
Swelling
Dissolution
Nitrogen
Porosity
Cells
Adsorption

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

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title = "Effect of mild alkali/ultrasound treatment on flax and hemp fibres: the different responses of the two substrates",
abstract = "Flax and hemp fibres were treated by various combinations of water/diluted alkaline solution and stirring/ultrasound, respectively. Changes in the microstructure (scanning electron microscopy) and porous structure (low-temperature nitrogen adsorption), removal of non-cellulosic materials (weight loss, FTIR), mean fibre diameter, and adhesion of the polypropylene matrix to the fibres (micro-bond test) were investigated. For both types of fibres, removal of (FTIR) was observed. The fibre diameter of hemp was decreased by several treatments, most of all by stirring in alkali and subsequent sonication in water, while the ultrasound applied in alkali solution did not change the fibre fineness. This can be attributed to the dual effect of ultra-sonication: the swelling effect of alkali combined with ultrasound energy probably served the sticking of inter-fibrillar material rather than their dissolution. Fibre diameter of flax did not change in any circumstances. The porosity of hemp in the mesopore range increased, while that of flax decreased by alkali treatment and subsequent sonication. The reason for this difference might be the dissimilar cell wall structures of the two bast fibres, the high arabinose content of the hemp, and/or the cottonisation of hemp. No treatments altered the fibre-matrix adhesion measured by pulling out the fibre from a micro-droplet of polypropylene.",
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T1 - Effect of mild alkali/ultrasound treatment on flax and hemp fibres

T2 - the different responses of the two substrates

AU - Borsa, J.

AU - László, K.

AU - Boguslavsky, Lydia

AU - Takács, E.

AU - Rácz, I.

AU - Tóth, Tünde

AU - Szabó, Dávid

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KW - Fibre diameter

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KW - Nitrogen adsorption

KW - Porosity

KW - Ultrasonic cleaning

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