Preparation and Barrier Performance of Layer-Modified Soil-Stripping/Cassava Starch Composite Films

Abstract

In this study, we investigated the barrier properties of a montmorillonite-reinforced biomass material, starch. Organically modified montmorillonite materials were prepared from natural montmorillonite by reacting it with dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride or octadecyl trimethyl ammonium chloride under ultrasonic conditions. The composite starch films incorporated with these organically modified montmorillonite samples were characterized by scanning electron microscopy, transmission electron microscopy, infrared spectroscopy and X-ray diffraction. The results showed that the introduction of montmorillonite decreases the transmittance of the composite film by 10% in the visible region and significantly inhibits UV-light transmittance. The decomposition temperature of the composite film ranges from 200 to 500 °C, with a weight loss rate of 80%. The distance between the montmorillonite layers increases from 0.14 nm in the non-magnetized state to 1.49 nm after magnetization. The oxygen permeability of the starch film modified by organic montmorillonite (0.067 cm3/m2·d) is lower than that of the montmorillonite starch film without magnetization (0.097cm3/m2·d). The oxygen barrier capacity is close to zero. Particularly in the ordered magnetic montmorillonite starch composite film, the oxygen barrier ability is the best. Therefore, modified montmorillonite could serve as an excellent reinforcing agent for cassava starch films and effectively improve the oxygen barrier performance of the films.

A novel alkylpolyglucoside‐modified montmorillonite‐filled starch bionanocomposites produced by extrusion

“…Regarding WVP , this barrier property depends on the diffusivity and solubility of water vapor molecules in the matrix 47 . The decreasing behavior found (Figure 2) can thus be associated with the same explanation above for solubility, in addition to good dispersion of MMT stacks and platelets in the starch matrix that created a tortuous pathway for the diffusion of water molecules throughout the material, enhancing the WVP in the nano‐structured starch 32,47,61 …”

“…14 The last step with a sharp peak at $226 C corresponds to the principal degradation of starch components. 14,48,59,61 In general, the thermal stability of thermoplastic starches was not significantly affected by the incorporation of the nanofillers, since the initial thermal degradation (T onset ) was 272.4 C for NS and $ 273.5 C for the bionanocomposites. Similar results in the thermal behavior of starch-MMT bionanocomposites had already been reported.…”

“…47 The decreasing behavior found (Figure 2) can thus be associated with the same explanation above for solubility, in addition to good dispersion of MMT stacks and platelets in the starch matrix that created a tortuous pathway for the diffusion of water molecules throughout the material, enhancing the WVP in the nano-structured starch. 32,47,61 The same discussion above is applied to the behavior reached by the addition of APG-modified montmorillonite in P 0 O 2 of the starch bionanocomposites. A similar effect of the good dispersion of lamellar structure of modified montmorillonite in oxygen permeability of cassava starch was reported in the literature.…”

Recent Developments in Cassava (Manihot esculenta) Based Biocomposites and Their Potential Industrial Applications: A Comprehensive Review

“…The composite exhibited the Maltese cross-pattern as analyzed from the polarized light microscopy. According to Huang, Han, et al [ 206 ], cassava starch reinforced with montmorillonite was manufactured and its barrier properties were investigated. The montmorillonite was modified with ultrasonic, magnetization conditions, and organic modifiers, as the intercalation reaction was used to improve its barrier performance.…”

Morphology and Selected Properties of Modified Potato Thermoplastic Starch

“…However, due to poor mechanical properties and high hygroscopicity, plasticized starch cannot yet compete with polymers from non-renewable raw materials. To overcome these problems, nanocellulose [ 21 ], montmorillonite [ 22 , 23 ], kaolin [ 24 ], bentonite [ 25 ], nano silica [ 26 ], chitosan [ 27 , 28 ] and halloysite [ 29 , 30 ] have been used.…”