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Gewählte Doctoral Thesis:

Bojan Stefanovic (2014): Mechanism for cellulose modification – degradation and surface modification.
Doctoral Thesis - Abteilung für Chemie nachwachsender Rohstoffe, BOKU-Universität für Bodenkultur, pp 102. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Cellulose is a versatile starting material for production of cellulose derivatives which can be used in different industries. In most cases, cellulose modification is a prerequisite for direct incorporation in various applications. The high molecular weight of cellulose and the crystalline structure often restrict direct incorporation and this is the reason why cellulose modification often goes along with a selective degradation step. For that purpose, the effects of tribochemical and sonochemical treatments were examined. Significant and fast reduction in the degree of polymerization was observed, which is not dependent on the lignin content in the pulp. Mechanical degradation processes are accompanied with cellulose oxidation as seen in the introduction of carbonyl groups located at or very close to either the reducing or non-reducing end groups in case of sonication, and more along cellulose chains when the sample is milled. Apparel industry is still predominantly cotton based, and cotton requires some pretreatments such as a surface modification to decrease textile properties like wrinkling. The effect of different aqueous emulsions of vegetable oils on the wrinkle recovery properties on a 100% cotton fabric was investigated. The results prove that the chemical structure of the fatty acid is an important parameter affecting the wrinkle recovery properties. In addition, higher concentration of the active agent (vegetable oil) provides better wrinkle recovery. The results suggest that better wrinkle recovery is due to the formation of a micro-film around the fibers and yarns that reduces the friction coefficient.

Betreuer: Potthast Antje
1. Berater: Rosenau Thomas
2. Berater: Kostic Mirjana

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