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RSC AdvancesThis is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.. Accepted Manuscripts are pu

RSC Advances

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Y Zheng and A Wang, RSC Adv., 2014, DOI: 10.1039/C4RA10866C.

Utilization of hollow Kapok fiber for the fabrication of a pH-sensitive

ABSTRACT: Pretreated kapok fiber (PKF) with hollow tube structure was introduced

physicochemical characteristics.25~27 However, the intrinsic hydrophobic properties of

The synthetic process of the superabsorbent is eco-friendly and no organic solvent was

with large amount of distilled water until pH~7, and then dried in an oven at 100 oC for

rheological method, and expressed as the rheological curves of storage modulus (G′, Pa)

weighed after removing the residual fluids Water retention (WR) in the hydrogels was

1

calculated as:

2

100/

)( − ×

group of PKF backbone to form alkoxy radicals, resulting in active centers on the PKF

actually grafted onto the backbone of PKF

Thus, as like as other polysaccharides, -OH groups on the surface of PKF can graft with

networks, which was affected by the degree of crosslinking, the rigidity/flexibility and

of PKF in the superabsorbent contributed to increase the swelling properties due to

i

g i ion=RT∑ c −c

due to the stronger ion-crosslinking of multivalent ions with carboxylate groups on

lower at pH 2, but rapidly increased and kept almost constant at pH 4~10 The further

reached a maximum swelling (77 g/g), and then gradually decreased to a constant value

concentration of salt solution and the valence of cations Their swelling ratio decreased

21 G.B Marandi, G.R Mandavinia and S Ghafary, J Appl Polym Sci., 2011, 120,