Effects of surface treatment on the properties and interface effects of starch/hemp biocomposites

Preece, William Oliver (2010). Effects of surface treatment on the properties and interface effects of starch/hemp biocomposites B.Sc Thesis, School of Engineering, The University of Queensland.

       
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Author Preece, William Oliver
Thesis Title Effects of surface treatment on the properties and interface effects of starch/hemp biocomposites
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2010
Thesis type B.Sc Thesis
Supervisor Rowan Truss
Kim Sewell
Kevin Spencer
Total pages 91
Language eng
Subjects 091405 Mining Engineering
0913 Mechanical Engineering
Formatted abstract
This study focuses on the synthesis of a starch/hemp biocomposite and the effects that surface treatments on the hemp fibres have on the properties and interface effects of the starch/hemp biocomposites. The surface treatments that are studied are washing, mercerisation and soaking in a polyvinyl solution. This study contains the information necessary to synthesise a starch/hemp and starch/PVOH/hemp composite when using a hemp fibre mat as the reinforcement.

Tensile testing of the different materials showed that there was an increase in the mechanical properties of washed starch/hemp samples when compared to the untreated starch/hemp at a 95% confidence level. Similarly at a 95% confidence level, there was an increase in the tensile properties of the mercerised starch/PVOH/hemp samples when compared to the untreated sample of the same composition. This proved the initial hypothesis that surface treatments were able to increase the properties of the samples. However, the mercerised samples were expected to have the highest properties.

It was discovered that there was a large amount of variance in all of the results. This was due to the variability of the natural materials as well as the variability due to the use of the hemp fibre mat. The fibre orientation, fibre thickness and density were parameters that were unable to be controlled due to the materials used. This was thought to be the cause of the difference between the results and the initial hypothesis that mercerised samples would have the highest properties.

A scanning electron microscope (SEM) was used to view the interaction between the samples. It was determined that the washed and mercerised samples had the highest fibrematrix interaction. It was also discovered that the addition of PVOH increase the adhesion between the fibre and the matrix, especially in the mercerised samples. The SEM also confirmed the hypothesis for the variability found in the results as it was seen that there were large variations in the aforementioned factors.
Keyword Starch analysis
Surface treatment

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Fri, 12 Sep 2014, 11:49:15 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service