Design of moisture sensitive bio-based oxygen barriers by correlating the molecule structures to the functionality of the materials

PI: Anette Larsson 
Co-PI: Gunnar Westman, Christian Müller 
PhD Student/Postdoc: Robin Nilsson
Duration: 20190107-20230707

Intro                                                                                                                                                                                      

The project studies thermoplastic cellulose derivatives like cellulose acetate, cellulose acetate propionate, cellulose acetate, ethyl cellulose, hydroxypropyl methylcellulose, hydroxypropyl methylcellulose acetate succinate etc. The project aims to build up the understanding around how different substituents in the cellulose derivatives influence properties like glass transition temperature (Tg), melting temperature (Tm), the degradation temperature (Tdeg), free volume, crystallinity, water absorption, transport of water, water vapour, oxygen and other gases. To determine the permeability of gases in dry conditions, and at different relative humidities (RH), a part of the project is to construct a gas permeability instrument.

Objectives                                                                                                                                                                            

Scientific: Create a knowledge base on how different substituents on cellulose affects its barrier properties and how one can predict these effects from the chemical structure. 

Technical: How barrier properties are affected by changes in the chemical structure and also the thermal and mechanical properties. 

Description of how this project addresses the hypotheses in FibRe                                                                      

We hope that this project will generate knowledge over how different substituents alter the thermoplastic properties; knowledge that hopefully can be utilized for modification of cellulose molecules, but maybe also the hemicelluloses, located at the fiber surfaces. This knowledge can be used as input of experimental data to project #4 (the simulation project, Hedenqvist). When the gas permeability instrument is up and working, this project can support the center with such measurements, for example to project #6 (Malmström) or industrial needs.

Page manager Published: Wed 28 Sep 2022.