Preparation and Viscoelastic Properties of Composite Fibres Containing Cellulose Nanofibrils: Formation of a Coherent Fibrillar Network
Artikel i vetenskaplig tidskrift, 2016

Composite fibres with a matrix of poly(ethylene glycol) (PEG) and cellulose nanofibrils (CNF) as reinforcing elements were produced using a capillary viscometer. Two types of CNF were employed: one based on carboxymethylated pulp fibres and the other on TEMPO-oxidized pulp. Part of the latter nanofibrils was also grafted with PEG in order to improve the compatibility between the CNF and the PEG matrix. The nominal CNF-content was kept at 10 or 30 weight-%. The composite fibres were characterized by optical and scanning electron microscopy in addition to dynamic mechanical thermal analysis (DMTA). Evaluation of the storage modulus indicated a clear reinforcing effect of the CNF, more pronounced in the case of the grafted CNF and depending on the amount of CNF. An interesting feature observed during the DMTA-measurements was that the fibrils within the composite fibres appeared to forma rather coherent and load-bearing network which was evident even after removing of the PEG-phase (by melting). An analysis of the modulus of the composite fibres using a rather simple model indicated that the CNF were more efficient as reinforcing elements at lower concentrations which may be associated with a more pronounced aggregation as the volume fraction of CNF increased.

homogenization

rheology

suspensions

transparent

water

paper

biocomposites

microfibrillated cellulose

polymers

films

Författare

Tobias Moberg

Chalmers, Material- och tillverkningsteknik, Polymera material och kompositer

H. Tang

Kungliga Tekniska Högskolan (KTH)

Q. Zhou

Chalmers University of Technology

Kungliga Tekniska Högskolan (KTH)

Mikael Rigdahl

Wallenberg Wood Science Center (WWSC)

Chalmers, Material- och tillverkningsteknik, Polymera material och kompositer

Journal of Nanomaterials

1687-4110 (ISSN) 1687-4129 (eISSN)

9569236

Ämneskategorier

Materialteknik

DOI

10.1155/2016/9569236