Improvement of water vapor barrier and mechanical properties of sago starch‐kaolinite nanocomposites

Abstract

The composite films of sago starch were prepared by incorporation of various amount of kaolinite (K) and kaolinite intercalated by dimethyl sulfoxide (DMSO) (KD) via solution blending method in order to reduce the water vapor transmission and enhance mechanical properties of starch based films. The kaolinite intercalation by DMSO and the composite films were characterized by using X‐ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscope techniques. The result showed that well‐dispersed kaolinite layers were delaminated in the starch matrix attesting to intercalate and exfoliate composite films. The effect of kaolinite content on the water vapor transmission and tensile properties of the composite films was investigated. The water vapor transmission of the starch film (neat starch film ca. 0.132 g.cm3/h) decreased with the addition of K and KD to the starch. It was also observed that the maximum tensile strength (5.18 MPa) was attained for the composite film with 4% by weight of clay content. The improvement in the tensile strength and modulus of starch‐based composites was due to the strong interfacial interaction between matrix and kaolinite clay, correlating to the change of morphology of the starch composite films as revealed by scanning electron microscopy.

Developing thermoplastic corn starch composites filled with brewer's spent grain for applications in biodegradable films

“…It can also be related to the dehydration of loosely bound water molecules and the volatilizing of compounds with low molecular weight. [2] As expected, the mass loss of pure TPS was higher than the TPS/BSG composites, due to the higher amount of water used in the film preparation.…”

“…In brief, 1 g of each sample was dried in an oven at 105 C for 24 h, cooled in a desiccator, and then weighed again. The moisture content was calculated according to Equation (2), where m i is the initial mass, and m f is the final mass of dried samples.…”

“…In recent decades, starch has gained increasing attention concerning the production of thermoplastic films due to its renewability, biodegradability in soil and water, abundance, and low cost. [1,2] Starch granules can be obtained from various botanical sources, [3,4] among which corn is one of the most explored. The production of thermoplastic starch (TPS) films involves disrupting starch granules, usually in a process that comprises the formation of an aqueous dispersion of starch and the addition of a plasticizer such as glycerol or sorbitol, followed by heating (70-90 C) and stirring.…”

Swelling and Shrinking Behavior of Modified Starch Biopolymer with Iron Oxide

“…[16] For improving the properties, [17][18][19] of the starch polymer, [20] starch can be mixed with various synthetics, [21,22] and natural polymers [23] such as multilayer structures, [24,25] with aliphatic polyesters, chitosan, blends with natural rubber and composites with fibers. [26,27] The modified properties of biopolymer [28][29][30][31][32] can be utilized in different applications such as polymer electrolytes for lithium batteries, [33] electronic applications, [34,35] as a membranes for separation, as a catalysis, lab-on-chip technologies, stimuli-responsive shape memory polymer, [36] biomedical application, [37,38] orthopedic surgery, [39] tissue engineering, and 3D printed scaffolds for bone tissue regeneration. [40] The biopolymer based design can be inspired from mussel-inspired crosslinking, [41] microporous shape memory polymers, [42] biomaterials science and engineering.…”

Thermal degradation behavior and structures of thermoplastic cassava starch/sisal fiber composites

“…The tensile strength and modulus of starch‐based composites were improved with the addition of kaolinite clay, due to the strong interfacial interaction between matrix and kaolinite clay. [ 4 ] The tensile, thermal, and dynamic mechanical properties and water absorption of starch composites have good improvement by a weed velvet leaf stem‐derived microfibers (VLF) for its high aspect ratio and good dispersity in starch matrix. [ 5 ] Aggarwal et al [ 6 ] studied the thermal degradation behavior of corn starch in different atmospheres, showing that the thermal degradation behavior of corn starch in air atmosphere was different due to the participation of oxygen.…”