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Nanocomposites Based on Whey Protein Nano-Fibrils and Matrix
KTH, School of Chemical Science and Engineering (CHE).
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Vassleproteinnanokompositer (Swedish)
Abstract [en]

The inclusion of nanoparticles has opened new possibilities to enhance and tune the properties of biobased materials. We here explored an approach to create protein homo-nanocomposites in which the nanoparticles and matrix are made from the same raw material. Whey protein isolate, as the raw material, are known to self-assemble into highly ordered nanofibrils under certain conditions. 2.5 - 15 % of protein nanofi brils solution was mixed with non-fibrillar matrix and 33 % glycerol as plasticizer. Tensile tests indicated increased elastic modulus and decreased  maximal elongation as function of increasing amounts of nanofibrils. The ultimate strength was less affected. It can be explained by the growth of  strongly  hydrogen-bonded peptide group in P-s heets observed by  IR  spectroscopy.  The  undulating  surface  and exifoliated P-sheets a lso have influence on the mechanical properties of the films.  Taken together, our study shows that it is possible to control the mechanical properties  of protein­  based materials  by addition  of protein nanofibrils.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Nanofibril, Nanocomposite, Whey protein, Characterization, Mechanical properties
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-216403OAI: oai:DiVA.org:kth-216403DiVA, id: diva2:1150933
Available from: 2017-10-20 Created: 2017-10-20 Last updated: 2017-10-20Bibliographically approved

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