Ice-templated cellulose nanofiber structures as reinforcement material in composites

Thesis event information

Date and time of the thesis defence

Place of the thesis defence

Linnanmaa, auditorium L10

Topic of the dissertation

Ice-templated cellulose nanofiber structures as reinforcement material in composites

Doctoral candidate

Master of Science in Technology Tuukka Nissilä

Faculty and unit

University of Oulu Graduate School, Faculty of Technology, Fibre and Particle Engineering Research Unit

Subject of study

Process engineering

Opponent

Professor Alexander Bismarck, University of Vienna

Custos

Professor Henrikki Liimatainen, University of Oulu

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Cellulose fibers with a size of several millionths of a meter can be used as reinforcement material in composites

A method for using nanocellulose as reinforcement material in composites was developed in this doctoral thesis work. The method utilizes a special physical phenomenon based on unidirectional freezing of water. Foam-like and thread-like nanocellulose structures can thus be prepared that may be used similarly to traditional reinforcement fibers.

Composites are used in many of our everyday objects and appliances. They are usually composed of two separate materials – one that acts as a glue-like binder and another that brings strength and stiffness to the whole. Composites are especially useful in applications demanding lightness and good performance.

Plant-based nanocellulose is a promising replacement for the non-renewable reinforcement materials such as glass and carbon fibers. The mechanical properties are competitive, but the absence of a working fabrication process has long been an issue. The results of the thesis are an important contribution towards finding a practical solution to the problem.
Last updated: 11.2.2022