Alteration of bacterial nanocellulose structure by in situ modification using polyethylene glycol and carbohydrate additives |
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Authors: | Nadine Heßler Dieter Klemm |
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Affiliation: | 1. Institute of Technical Chemistry and Environmental Chemistry, Friedrich-Schiller-Universit?t Jena, Lessingstra?e 12, 07743, Jena, Germany 2. POLYMET Jena e.V., Transfer Group at Friedrich-Schiller-Universit?t Jena, Technologie-und Innovationspark, Wildenbruchstra?e 15, 07745, Jena, Germany
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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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