Beta 1


Title Mekanisk karakterisering af biopolymerer
Author Laursen, Louise Løcke
Løvdal, Alexandra
Supervisor Mikkelsen, Lars Pilgaard (Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Madsen, Bo (Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Bachelor thesis
Year 2009
Abstract Due to the fact that the world’s stockpile of fossil material is diminishing and the demand is continuously increasing, the last 2 decades has seen an expanding focus on the development of renewable raw material as an alternative. One of the initiatives is the development of biopolymers. Because biopolymers are especially temperature sensitive, the aim of this study has been to characterize how the mechanical properties of the biopolymer, PLA 4032D and the corresponding jute/PLA, changes under the influence of temperature. In this study the reference matrix, PLA 4032D from Natureworks, was compared to other types of PLA. Furthermore jute/PLA 4032D was compared with a jute/ PLA, into which a filler was added to the matrix in hopes of making the PLA more temperature resistant. The test specimens’ dimensions follow the ISO 527-1 standard. The results of the tensile test are obtained using an Instron 1115, upon which an oven is mounted, so that the specimens can be tested at a controlled temperature elevation. The data set is collected in DASYlab9, and the further data processing is carried out in MatLab . Based on the results, we have concluded that jute/PLA 4032D has superior mechanical properties compared to jute/PLA 2002D until 50oC, after which both jute/PLA types’ mechanical properties are severely reduced. Because of this jute/PLA CA24-001, from Toray, is tested. This PLA is filler reinforced, and therefore is expected to be more temperature resistant. Due to too many irregularities in the obtained results from this PLA above 50 oC, it has not been possible to conclude if this PLA type is better than the reference material, still some of the results indicate that the reinforced PLA is more temperature resistant. The irregularities could be due to manufacturing difficulties. The results also show that it is possible to use the rule-of-mixture to calculate an expected Young’s modulus for the composite at all temperatures, however subjected to jutes changing properties during temperature elevation. Based on this report we conclude that at the present moment it is not possible to implement PLA in a wider field of application, where temperatures rise above 50-55 oC. Because of this its main use is still in packaging. If PLA is to compete with petroleum based polymers, further research is required.
Imprint Danmarks Tekniske Universitet (DTU) : Roskilde, Danmark
Pages 55
Keywords Materialeforskning; Materials research; Materialekarakterisering og materialemodellering; Materials characterization and modelling
Fulltext
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Admin Creation date: 2009-06-22    Update date: 2010-08-25    Source: dtu    ID: 245142    Original MXD