Development and characterization of nanosoy‐reinforced dextran nanocomposite membranes

Abstract

Crosslinked nanocomposite membranes were developed by in situ reaction of dextran and soy protein isolate nanoparticles (nanosoy). The formation of a covalent bond between the reducing end of dextran and the amine groups of nanosoy (NS) leads to the in situ crosslinking. The NS particles employed for this study were 5-15 nm in size, as observed in the high-resolution transmission electron microscopy micrograph. Glycerol addition assisted in the plasticization of the membranes, thus improving their flexibility and handling features. The effect of polymer composition on the extent of crosslinking, morphology, and flexibility of the films was investigated. Field emission scanning electron microscopy and atomic force microscopy revealed that single-phase, homogeneous membranes are obtained within a specific composition of dextran/NS/glycerol (D/NS/G). The degree of crosslinking was evaluated by Raman spectroscopy and gel content measurements. The crystallinity of the D/NS/G membranes was found to increase monotonically as the NS content in the blend increased. An increase in tensile strength and decrease in Young's modulus was observed with an increase in NS content up to 28%, due to the reinforcing effect of NS and the plasticizing effect of glycerol playing roles simultaneously in the system. The reinforcing effect of the NS assisted in the formation of high-strength nanocomposite membranes. Furthermore, they were characterized to analyze their thermal behavior. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44655.

Multi-Bit Biomemristic Behavior for Neutral Polysaccharide Dextran Blended with Chitosan

“…The bands at 850 cm −1 and 923 cm −1 occurred due to C-O-C stretching. With the incremental content of chitosan (B1, B2, B3, and B4), the band at 542 cm −1 had a low intensity, manifesting dextran and chitosan compatibility as a result of the interaction between the two [ 20 ].…”

“…For chitosan, a prominent peak at 1645 cm −1 originated from NH wagging and carbonyl stretching of the amide group. The augmentation of the dextran content up to 50% rendered the signal intensity extremely weak for the peak due to the glucopyranose ring and glycoside bond interaction, as well as for NH wagging, exhibiting the existence of a strong interaction between the two components [ 20 ]. By the comparison between pure chitosan and its nanocomposites (B1, B2, B3, and B4), a red shift in the peaks from 1380 cm −1 to 1369 cm −1 (ν(C-H) in (CH 2 OH)) as a result of hydrogen bonding interactions between chitosan and dextran could be seen [ 21 ].…”

“…With the incremental consumption of nonrenewable resources and the growth rate of electronic waste, biodegradable electronic devices have seized considerable opportunities in advanced sustainable electronics [ 19 ]. Neutral natural biomaterials such as dextran, pullulan, and konjac flour are abundant in nature, and their biodegradability, nontoxicity, and renewability make for developing eco-friendly biodegradable electronics [ 20 ]. Nevertheless, biomemristors based on neutral natural biomaterials are rarely reported, and the research on their proton conductive behavior is as yet lacking.…”