Abstract
Bacterial nanocellulose (BC) is characterized by an exciting interconnection of the important and well-known cellulose properties with the outstanding features of nano-scale materials. As a remarkable benefit of BC the property-controlling fiber network and pore system formed by self-assembly of the cellulose molecules can be modified in situ using additives during biosynthesis. The addition of polyethylene glycol (PEG) 4000 causes a pore size decrease. In presence of β-cyclodextrin or PEG 400 remarkably increased pores can be achieved. Surprisingly, these co-substrates act as removable auxiliaries not incorporated in the BC samples. In contrast, carboxymethyl cellulose and methyl cellulose as additives lead to structural modified composite materials. Using cationic starch (2-hydroxy-3-trimethylammoniumpropyl starch chloride, TMAP starch) double-network BC composites by incorporation of the starch derivative in the BC prepolymer were obtained.
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Abbreviations
- BC:
-
Bacterial nanocellulose
- CMC:
-
Carboxymethyl cellulose
- DP:
-
Degree of polymerization
- DS:
-
Degree of substitution
- DSC:
-
Differential scanning calorimetry
- DSMZ:
-
Deutsche Sammlung von Mikroorganismen und Zellkulturen
- GlcNAc:
-
N-Acetyl glucosamine
- GPC:
-
Gel permeation chromatography
- HS:
-
Hestrin-Schramm
- MC:
-
Methyl cellulose
- MN :
-
Number molecular weight
- MW :
-
Weight molecular weight
- PDI:
-
Polydispersity
- PEG/PEO:
-
Polyethylene glycol
- SEM:
-
Scanning electron microscopy
- TMAP starch:
-
2-hydroxy-3-trimethylammoniumpropyl starch chloride
- UDP glucose:
-
uridine diphosphate glucose
- WHC:
-
Water holding capacitiy
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Acknowledgments
Among many colleagues from the Institute of Organic and Macromolecular Chemistry as well as the lab, authors are especially grateful to Dr. Tim Liebert for the production of TMAP starch. We thank Dr. Völksch for SEM investigations and Mrs. Weiß for DSC measurements. Special thanks go to Prof. Antje Potthast (Department of Chemistry, University of natural resources and applied life sciences, Vienna)for the GPC investigations.
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Heßler, N., Klemm, D. Alteration of bacterial nanocellulose structure by in situ modification using polyethylene glycol and carbohydrate additives. Cellulose 16, 899–910 (2009). https://doi.org/10.1007/s10570-009-9301-5
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DOI: https://doi.org/10.1007/s10570-009-9301-5