Development and investigation of thermal insulating composite from fibrous plants

Rūta Stapulionienė

Doctoral dissertation

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Properties of natural fibres and thermal insulating composites from natural fibres are analysed in the thesis. The main objects of the research are natural fibres: long and short hemp as well as flax fibres for the formation of composite structure, two binding materials – polylactide (PLA) and peat fibres; fibrous composite made from hemp and binding material – PLA as well as hemp and binding material – peat fibres. Their detail analysis allows formation of effective composite characterised by sufficient thermal insulating properties. The main aim of the thesis is proper selection of natural fibres for the formation of composite, technological parameters, additive (hydrophobyzers and fire retardants) types and their concentrations.

The thesis consists of introduction, three chapters, general conclusions, references and the list of author’s publications related to thesis topic list.

The first chapter is designed for literature analysis. It presents general information about the classification of natural fibres. This chapter as well presents science research about results of the chemical composition and analysis of structure of fibres and properties analysis of composites from natural fibres and binding materials. The review also covers the literature related to binding materials used for the research and detail analysis of PLA and peat fibres. Conclusions and specified objectives are formulated at the end of this chapter.

Second chapter consists of description of materials used for the research, forming technology of fibres composite. The conducted methods and equipment are presented as well.

Third chapter presents the research results of natural fibres properties and structure analysis. Impact of differently mechanically treated natural fibres on thermal conductivity is investigated; hemp fibres for the formation of composite are selected. Physical and mechanical properties of composite made from hemo fibres and PLA binder is examined, optimal amount of binding material, impact of technological parameters, additives on physical-mechanical properties of fibrous composite are determined. The macro- and microstructures of fibrous composite are investigated as well. This chapter presents properties and structure analysis of composite from hemp and peat fibres.

4 scientific articles are published on the topic of the dissertation: one in scientific journal included in the Thomson Reuters Web of Knowledge (ISI Web of Science) with a citation index, two – in scientific journals of international databases; one – in the Lithuanian conference proceedings. Results of this thesis were presented in 5 conferences in Lithuania and other countries.

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145×205 mm
144 p.
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