Characterization of the Structural and Physical Properties of the Thermoplastic Starch Film with Kaolinite and Beeswax Addition

Abstract

The aim of the study was to investigate the influence of kaolinite (KA) and beeswax (BW) addition on the structural and physical properties of thermoplastic starch (TPS) films. The casting method was applied and glycerol was used as a plasticizer. Microstructure analyzes were made by a stereoscopic and a scanning electron microscope. Tensile tests were carried out under static load conditions at three different deformation velocities of V = 0.0001, 0.001, and 0.01 m/s. The studies of surfaces characteristic were performed using water contact angle and water vapor isotherm measurements. The most homogeneous structure of the surface with higher mean values of failure stress and elasticity modulus was observed for thermoplastic starch films with kaolinite addition. The significant reduction in dynamics changes of water contact angle (10 %) of BW films in the time 0-20 s as well as tensile strength decrease was noted (compared to pure TPS films). The research results suggest the validity of using BW and KA to improve the barrier and mechanical properties of TPS films. Further research should focus on to improve the starch-beeswax-kaolinite combination and increase the homogeneity of the structure of films in order to upswing their simultaneous impact on barrier and mechanical properties.

Enhancing the Mechanical Properties of Corn Starch Films for Sustainable Food Packaging by Optimizing Enzymatic Hydrolysis

“…The casting technique was used to prepare films of hydrolyzed corn starch powder, glycerol, and glacial acetic acid according to the methodology of Beer-Lech et al [31]. First, 20 ± 5 g of hydrolyzed corn starch powder was mixed with 150 ± 5 mL of distilled water at 50 ± 5 • C to prepare the film-forming solution.…”

Characterization of biodegradable bi‐layer films from thermoplastic starch and poly‐l‐lactic acid

“…However, the coating of the PLA layer with TPS significantly decreased the surface wettability of the bi‐layer film. During the film forming of the TPS layer (upper side), the most hydrophobic and branched parts of the amylopectin chain in TPS are directed towards the outer surface 38 and resulted in a higher WCA value in bi‐layer films when compared with neat TPS film. The obtained results were also in accordance with WU and WVP values of mono and bi‐layer films.…”

The characterisation of cornstarch‐based chlorophyllin composite film for preservation of shrimp under photodynamic irradiation

“…Following that, 1%, 3% and 5% of Chl powder‐containing CS‐Chl x film samples showed 35.64°, 93.22° and 94.89° of WCA respectively. The similar results were also reported by previous study that the edible film made by starch and kaolinite detected higher WCA values (Beer‐Lech et al ., 2022). However, previous research has shown that adding hydrophilic substances to CS‐based composite films resulted in lower WCA (Wang et al ., 2022).…”

“…The TGA technique is an important technique used to study the thermal stability and decomposition behaviour of film‐forming materials under different temperature conditions (Beer‐Lech et al ., 2022). Figure 6 shows the thermal gravimetric analysis (TGA) and derivative thermal gravimetric analysis (DTG) curves of Chl powder, CS and CS‐Chl x films.…”