Comparison of Enzymatically Separated Hemp and Nettle Fibre to Chemically Separated and Steam Exploded Hemp Fibre

Dreyer, Jürgen; Müssig, Jörg; Koschke, N.; Ibenthal, W.-D.; Harig, H.

doi:10.1300/j237v07n01_05

Cited by 38 publications

(21 citation statements)

References 8 publications

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“…Enzymatic treatment also had a negative influence on the mechanical properties of the tested hemp fibres as has been reported for hemp [40,11] and flax in the literature [16,20,9]. A 48 hrs enzymatic treatment reduced the Young's modulus and tensile strength by ~77 % and 83 %, respectively, The fibres prepared by the combinative hydrothermal-enzymatic treatment exhibited a significant drop in mechanical properties after the enzymatic treatment, especially in the first few hours of treatment.…”

Section: Effect Of Treatment On Tensile Propertiessupporting

confidence: 62%

“…The most influential parameters are known to be the enzyme activity, enzyme concentration, treatment duration and use of additives such as chelating agents (e.g. EDTA) [9,11,[15][16][17][18]20,21,39,[40][41][42][43]. Dreyer et al [40] compared the mechanical properties of hemp after treatment with three different enzyme solutions with an alkaline treatment in 0.4 % sodium carbonate at 100 o C. The enzymatic treatments led to large variations in strength from <0.25 % to 150 % of the alkaline-treated fibre [40,20,29,9].…”

Section: Introductionmentioning

confidence: 99%

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Effect of processing route on the composition and properties of hemp fibre

Korte

Staiger

2008

Fibers Polym

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There is great interest in the plant Cannabis sativa (hemp) as a source of technical fibres for the reinforcement of polymers in composite materials due to its high mechanical properties. In this work, the effect of enzymatic, hydrothermal and alkaline treatments on the composition and mechanical properties of hemp fibre are compared. The influence of enzyme concentration and treatment time was examined (2.5-80 % Pectinex® Ultra SP-L, 6-48 hrs). Additionally, hydrothermal (170 o C, 10 bars) and alkaline treatments (18 wt. % NaOH, 40 o C) were used as pre-treatments to observe their effect on subsequent enzymatic treatment. The composition of hemp fibre was analysed by wet chemistry and Fourier transform infrared spectroscopy, while microstructure and mechanical properties were examined by scanning electron microscopy and tensile testing, respectively. Enzymatic treatment resulted in extensive fibrillation and removal of non-cellulosic components, especially when combined with hydrothermal treatment. However, a lengthy enzymatic treatment or combinative enzymatic-alkaline treatment led to extensive fibre breakdown that was accompanied by a pronounced reduction in the mechanical properties. Enzymatic treatment decreased Young's modulus and tensile strength by 77 and 73 % respectively, and alkaline treatment by 83 and 36 %. The hydrothermal treatment resulted in only minor changes in these properties.

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Section: Effect Of Treatment On Tensile Propertiessupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Effect of processing route on the composition and properties of hemp fibre

Korte

Staiger

2008

Fibers Polym

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“…Application of natural fibre composites to niche markets is in momentum during the last 10 years, especially in the automotive sector [29,233]. The primary production of plant fibre was estimated to 2 ×10 11 t in 2000 compared to 1.5 × 10 8 t synthetic polymers [234], while the estimated fibrous raw materials from agricultural crops are about 2.5 ×10 9 t [235]. The North American market for natural fibre is projected to grow from USD 155 million in 2000 to USD 1.38 billion by 2025 [2].…”

Section: Environmental and Economic Impact Of Biocompositesmentioning

confidence: 99%

A review of the recent developments in biocomposites based on natural fibres and their application perspectives

Gurunathan

Mohanty

Nayak

2015

Composites Part A: Applied Science and Manufacturing

1,052

535

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“…To improve hemp fibre quality additional refining procedures are required, i.e., cleaning the surface and splitting fibre bundles into finer units, ideally into individual fibre cells. For refining various methods may be adapted including steam explosion [11], ball milling of thermally treated fibres [12,13,14], chemical degumming in alkaline media [15,16], enzymatic separation of technical fibres, and scouring [17,18].…”

Section: Fibre Refiningmentioning

confidence: 99%