Monday 19 November 2012

Practical Polysaccharides (Part 6) Collaboration between modified fibres and SAP

Part 6 of the paper by Jacek K. Dutkiewicz of Buckeye Technologies Inc given at this years Insight Conference organised by MTS in Norfolk Virginia. (Click here for Part 1)

One of these solutions utilizes cellulose fluff carrying polyvalent cations such as Al3+ [6].  These ions are subsequently released to the entering liquid and can precipitate the soluble sodium polyacrylate fraction which diffuses from the SAP particles. The polyvalent cations can also react with the surface of the superabsorbent granules creating in situ a “skin” on them, which protects the soluble oligomers from leaching out to the system.  This concept is illustrated in Fig. 9.  As a result of the collaborative interaction between the modified fibers and the SAP, the permeability of the system is improved as is the efficiency of the fiber matrix liquid distribution capability.

Here is another example of a system in which cellulosic fibers can help enhance
the performance of the superabsorbent powder.  In this case, the problem is that the SAP granules tend to swell rapidly when insulted with body fluid and thus block the pores within the fiber network. As a result, the liquid cannot be well distributed and the material cannot be fully utilized.   The need is to slow down the swelling of the SAP powder without sacrificing its absorbent capacity.  The solution is illustrated in Fig. 10.

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