Cross-linked porous starch has become a subject of research interest recently. The degree of cross-linking and the freezethaw stability are critical for cross-linked porous starch with respect to its practical applications. Herein, cross-linked porous corn starch (c-PCS) was prepared by the pre-alkalization of porous corn starch (PCS) using NaCl/NaOH which was then crosslinked using epichlorohydrin (ECH). The effects of key experimental parameters involved in both the pre-alkalization process (i.e., the mass ratio of NaOH to PCS (m NaOH /m pcs ), the mass ratio of NaCl to PCS (m NaCl /m pcs ), the temperature (T a ), and the reaction time (t a )) and the cross-linking reaction (the ratio of ECH volume to the mass of PCS (V ECH /m pcs ), the ratio of solution volume to the mass of PCS (V s /m pcs ), pH value, the temperature (T c ), and the reaction time (t c )) on the cross-linking degree and freeze-thaw stability of c-PCS were investigated in details. Results show that optimum conditions for the pre-alkalization and cross-linking reaction to obtain c-PCS are as follows: m NaCl /m pcs is 0.06, m NaOH /m pcs is 0.02, T a is 40 °C and t a is 1.0 h, V ECH /m pcs is 0.003 (mL/g), V s /m pcs is 7 (mL/g), pH is 10, T c is 20 °C, and t c is 3.0 h. The morphology, crystalline structure and thermal stability of the as-obtained c-PCS were also investigated, suggesting that the surface became rougher, the crystallinity was decreased, and the thermal stability was enhanced resulting from the cross-linking reaction.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.