Properties of low methoxyl pectin‐carboxymethyl cellulose based on montmorillonite nanocomposite films

Abstract

In this study, the low methoxyl pectin-carboxymethyl cellulose-based montmorillonite (LMP-CMC-MMT, LCM) nanocomposite films with nine ratios of LMP:CMC (from 10:0 to 0:10) and different MMT contents (1-8 wt%) were prepared. The mechanical properties, colour, opacity and water vapour permeability (WVP) of composite films were investigated. The maximum of tensile strength (TS) of composite films was 39.85 AE 2.51 MPa at LMP:CMC ratio of 4:6 and 4 wt% MMT (LCM47), which indicated the formation of hydrogen bonds between MMT and LMP-CMC. The reduction of WVP of the LCM47 composite film was 333% of that of the CMC film due to the tortuous path caused by MMT incorporation. LCM composite films had the higher b*-and DE*-values and lower L*-values in comparison with LMP-CMC (LC) composite films. The LCM composite films showed a decrease in transparency as MMT content increased.

Effects of ultrasound time on the properties of methylcellulose-montmorillonite films

“…There was not any direct report about WVP of MC-MMT films in other papers, while Turhan and Sahbaz [32] reported WVP of MC films (without MMT) around 0.4 9 10 -3 g/m h KPa, which was nearly like the obtained result in present research [32]. Yu et al [33] announced that WVP of carboxymethylcellulose films with 4% MMT was 0.8 9 10 -5 g/m h KPa. The difference of the basic polymers and the presence of glycerol are the main reasons of higher WVP in present study.…”

“…Rodriguez et al [39] reported that b* of cellulose acetate with 7.5% MMT was 1.6 and Yu et al [33] announced that the b* of carboxymethylcellulose with 8% MMT was 0.09, while in present research the maximum b* (3.475; 60 min) was outstandingly higher than the other reported values. Tunc and Duman [6] reported the opacity of MC-MMT films (with 20% MMT) around 6.7.…”

“…The reason of lower opacity in this study (1.7, when thickness is in micron) is applying lower MMT content (13%) in the films. Rodriguez et al [36] and Yu et al [33] reported the opacity of cellulose acetate and carboxymethylcellulose films 2.81 and 2.18, respectively [6,36,39]. The kind of polymer, MMT content, and the method of film preparation are the reasons of these differences.…”

Production of Pectin-Cellulose Biofilms: A New Approach for Citrus Waste Recycling

“…Yu et al [15] varied the ratio between LM pectin and CMC to prepare nanocomposites by adding up to 8% w/w of montmorillonite reinforcement to the solutions. The tensile strengths of the unreinforced polymers were measured from approximately 16 to 32 MPa, and with reinforcement the tensile strength increased.…”

“…Nevertheless, pectin-based composites have been prepared with different reinforcing substances [12] and cellulosic plant fibres have 2 International Journal of Polymer Science certainly been of great interest because of their favourable mechanical properties as a potential substitute for glass fibres [13] in biocomposites. Cellulose reinforced pectin composites have been developed, for example, for tissue engineering applications [14] and for food packaging applications [15] from commercial sources. However, there is no study on directly using cellulosic fibres and pectin obtained from citrus waste to prepare a biofilm.…”