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Author:Alam, Mohammad Shafiul
Title:Preparation of hemp fibres for advanced bio-composite applications
Publication type:Master's thesis
Publication year:2010
Pages:x + 71      Language:   eng
Department/School:Kemian ja materiaalitieteiden tiedekunta
Main subject:Puutekniikka   (Puu-28)
Supervisor:Hughes, Mark
Instructor:Hänninen, Tuomas
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  2318   | Archive
Keywords:hemp
SEW pulping
viscosity
composites
Abstract (eng): SO2-ethanol-water (SEW) pulping has been introduced as a possible means of separating hemp technical fibres (fibre bundies) into fibre cultivates (single fibre).
Results about both the chemical and physical behaviour of SEW treated hemp fibres are presented.
This study was carried out with respect to conditions of pulping time, temperature and SO2 concentration.
The experiments were carried out at the input level of SO2 concentrations of 4, 8 and 12 % and 55 % (vol.) ethanol/H2O at temperatures of 115°C to 145°C and pulping times from 10 minutes to 90 minutes.
As a part of this study, the fibre separation process was evaluated from the result of dry matter contents, yield, viscosity and microscopy.
Treated fibres at lower temperature show higher yield (%) but at higher SO2 concentrations showed lower yield (%).
The viscosity of the SEW treated fibre is decreased with an increase of treatment time and temperature which is also same for higher SO2 concentrations.
It was also observed from the optical micrographs that increased cooking time and temperature made the fibre separation process more effective.

SEW treated fibre shows higher elastic modulus but most of the sample shows lower tensile strength than untreated fibre.
There is a correlation between viscosity and tensile strength, i.e. tensile strength increases with increasing viscosity.

The mechanical properties of epoxy-hemp composites were investigated.
The tensile strength of SEW treated hemp-epoxy composites were increased due to the removal of debris, fibre separation and surface roughness of treated fibre compared to the untreated fibre.
ED:2010-08-10
INSSI record number: 40070
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