Gel structure phase behavior in micro nanofibrillated cellulose containingin situprecipitated calcium carbonate
Autor: | Juuso Rantanen, Patrick A.C. Gane, Thaddeus Maloney, Katarina Dimic-Misic |
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Rok vydání: | 2016 |
Předmět: |
Materials science
Polymers and Plastics macromolecular substances 02 engineering and technology 010402 general chemistry composites 01 natural sciences chemistry.chemical_compound Surface area Rheology Phase (matter) Materials Chemistry Composite material Cellulose ta216 cellulose and other wood products Nanocomposite Precipitation (chemistry) General Chemistry gels 021001 nanoscience & nanotechnology Dewatering 0104 chemical sciences Surfaces Coatings and Films Calcium carbonate chemistry viscosity and viscoelasticity rheology 0210 nano-technology |
Zdroj: | Journal of Applied Polymer Science. 133 |
ISSN: | 0021-8995 |
Popis: | Speciality high-strength board, packaging grades, and novel cellulose-based nanocomposites may incorporate microcellulosic nanofibrillated materials (MNFC), although the rheological properties of such strongly water sorbing structures are challenging for processing technologies. This study introduces rheological methods for the evaluation of dewatering and flow behavior of such high consistency furnishes to exemplify the effect of energy input on microfibrillar material (MFC), as produced by a combination of enzymatic pretreatment and increased levels of fluidization. The large number of fibril contact points act to entrap water, held both on the fibril surface as immobilized water and in the interfibril spacing forming the gel structure. Tuning of the rheological and dewatering properties has been enabled by in situ precipitation of calcium carbonate filler (in situ PCC) on the MFC, which results in the production of a more uniform furnish. Such in situ PCC coated MFC fibrils incorporated into furnish were seen to increase dewatering rate over that of the furnish mix without the in situ precipitated filler primarily because of the reduction in total surface area of the fibers and fibrils when the pigment is present on the fibrillary surface. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43486. |
Databáze: | OpenAIRE |
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