Scholarly record
CHANGES OF MACROMOLECULAR PROPERTIES OF RECYCLED PULP FIBRES
Abstract
The production of pulps and paper has a variety of negative influence on the environment. There are some technologies which can moderate the negative impacts and they have also a positive economical ef fect (e.g. paper recycling). It causes the paper alterations, which results in the degr adation of their physical and mechanical properties. The recycling causes a chemi cal, thermal, biologi cal and mechanical destruction, or their combination. The aim of this work was to investigate changes of macromolecular weight distribution (MWD), polydispersity (PD) and degree of pol ymerization (DP) of recycled hardwood pulp fibres. These attributes were measured by size exclusion chromatography (SEC) of cellulose tricarbanilates (CTC). From the experimental results can be conc luded that the changes of investigated properties are not linear throughout the recycling process. Generally, decrease of DP values in consequence of glycosidic bonds splitting was observed. Moderate increase in some stages of recycling is due to cellulo se cross-linking, amorphous part of cellulose degradation, as well as various states of fibres at various recycling stages.
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