Incorporation of carboxyl groups into xylan for improved absorbency |
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Authors: | Abdus Salam Joel J Pawlak Richard A Venditti Khaled El-tahlawy |
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Institution: | (1) Department of Forest Biomaterials, North Carolina State University, Campus Box 8005, Raleigh, NC 27695-8005, USA;(2) Department of Textile Engineering Chemistry and Science, North Carolina State University, Raleigh, NC 27695-8301, USA; |
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Abstract: | The objective of this research was to investigate green, renewable reaction systems for xylan that introduce crosslinking
and carbonyl group for improved performance in water absorption applications. Xylan was modified separately with three different
reaction agents, citric acid, succinic anhydride and sodium monochloracetate (SMCA). The xylan was reacted with citric acid
in the presence or absence of sodium hypophosphite (SHP) as a catalyst, both in a solution form and in a semi-dry form in
an oven. Acid–base titrations, FTIR, TGA, and DSC were used to confirm the composition of the reactant products. Reacted xylan
had significantly increased carboxyl content, degree of esterification and degree of substitution with citric acid, succinic
anhydride, and sodium monochloracetate. Effective reaction conditions were determined for high yield products. For the xylan
reacted with citric acid, the catalyst (SHP) and the use of a semi-dry reaction condition increased the yield significantly.
Succinic anhydride and SMCA had high yields. The reaction trends observed were consistent with similar results for starch.
Increases in water absorption, saline solution absorption, and decreases in water contact angle for the xylan citrate relative
to the xylan indicate that high carboxyl content materials can be generated with xylan and that the resulting materials have
enhanced water affinity. |
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