Civil Engineering Reference
In-Depth Information
Figure 6.4
(A) Photographs of swollen hydrogel containing CMC/cellulose/Epichlorohydrin and
SEM cross-section of the freeze-dried hydrogel sample; (B) SEM image of a decorated nanoi bril and
large magnetic membranes (20 cm diameter) prepared by vacuum i ltration of the decorated nanoi bril
suspension; Reprinted with permission from [209, 216].
on the preparation of SHs derived from cellulose and two cellulose derivatives, CMC
and hydroxyethyl cellulose. In Sreenivasan
et al.
[218, 219] , a novel adsorbent, poly
(methacrylic acid-co-vinyl sulfonic acid)-grat ed-magnetite nanocellulose composite
(P(MAA-co-VSA)-g-MNCC) was synthesized for adsorbing hemoglobin (Hb) selec-
tively from aqueous solutions, showing that P(MAA-co-VSA)-g-MNCC would be a
promising material for the selective recovery of Hb from aqueous solutions.
6.5
Conclusions
h e interest for multifunctionality in composite materials without af ecting their envi-
ronmental friendliness led to a number of possibilities centred on the adoption of cel-
lulosic nanoreinforcement (CNR): for obtaining CNR, both top-down and bottom-up
procedures have been applied A number of issues are present nonetheless, whose solu-
tion appears central to achieving higher performance in composites including CNR.
A critical aspect involves controlling the polysaccharide source from which CNR are
extracted, which in turn has inl uence on its geometrical characteristics and its degree
of crystallinity and ultimately on its mechanical performance. Another set of problems
concerns the achievement of a sui ciently sound interface with a polymer matrix, more
ot en a water-soluble thermoplastic one, which is sometimes facilitated by opportune
