NDLI: Analysis of moisture sorption in lyocell-polypropylene composites

Content Provider	Springer Nature Link
Author	Cordin, Michael Griesser, Ulrich J. Bechtold, Thomas
Copyright Year	2017
Abstract	The preparation of composites by thermoforming of intermingled fibre slivers is an efficient method to receive high performance and lightweight materials. Cellulosic fibres have benefits like low density and sustainability but the sorption of water due to the high hydrophilicity of the cellulose requires attention. The swelling of the wet fibres changes the fibre-matrix adhesion and as a consequence, the mechanical strength of the composite is influenced negatively. In this study, the thermoplastic polypropylene was combined with lyocell fibres as reinforcement. Moisture sorption isotherms of cellulose/polypropylene composites were recorded as function of relative humidity. Additionally, the specific surface area was analysed by the Brunauer–Emmett–Teller model. It has been found, that the moisture sorption is influenced by the polypropylene (PP) ratio in the composites. At 60% relative humidity the moisture uptake of the lyocell fibres was reduced from 10.8 to 5.8% for lyocell embedded in a composite with 50% polypropylene. Besides the hysteresis between moisture sorption/desorption cycles was found to be proportional to the increased content of PP. The “Parallel Exponential Kinetics” (PEK) model was used to analyse the kinetics of moisture sorption of these composites in more detail. With the help of the PEK model the sorption/desorption kinetics were described by a fast and slow moisture sorption/desorption process. The capacity for rapid moisture sorption is reduced by the formation of PP layers on the lyocell surface. The share of slow moisture sorption increased with increasing PP content in the composite. The results support understanding of the interaction of water with cellulose containing composites.
Starting Page	1837
Ending Page	1847
Page Count	11
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	24
Issue Number	4
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-02-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cellulose Lyocell fibre Polypropylene Composite Moisture sorption PEK-model BET Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences Ceramics, Glass, Composites, Natural Materials Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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