Preparation, characterization and performances of biodegradable thermoplastic starch

Abstract

A biodegradable thermoplastic starch (TPS) was successfully prepared from plasticizer ethanolamine and native cornstarch. The hydrogen bonding interaction between starch and ethanolamine was investigated using Fourier transform infrared (FT‐IR). When the ethanolamine mass content was 30%, after the ethanolamine‐plasticized thermoplastic starch (ETPS) was stored at RH 50% for 14 days, the mechanical testing showed that the maximum tensile stress of the ETPS reached 5.98 MPa, the tensile strain reached 106.52%, Young's modulus increased from 38.14 MPa of glycerol‐plasticized thermoplastic starch (GTPS) to 75.32 MPa of ETPS, and the breaking energy increased from 1.921 N·m to 2.305 N·m, which indicated that the mechanical properties of ETPS evidently excelled those of the GTPS. The effects of water contents on the mechanical properties of ETPS and GTPS were studied. A differential scanning calorimetry (DSC) analysis revealed that the low‐temperature transition and the glass transition temperature (Tg) of the ETPS were −58 and 22°C respectively, which were lower than that of the GTPS. The ETPS effectively restrained the re‐crystallization of traditional GTPS, which was proved by the X‐ray diffraction (XRD). The scanning electron microscopy (SEM) images presented that ethanolamine made starch uniform. Copyright © 2007 John Wiley & Sons, Ltd.

Effects of glycerol and storage relative humidity on the properties of kudzu starch‐based edible films

“…However, its shoulder peak became more obvious as glycerol content increased, which implied the formation of new and stronger hydrogen bonds. The peaks at 1153 and 1081 cm À1 were ascribed to the C-O stretching of the C-O-H group in starch [19] and their positions did not seem to change in all the spectra. The characteristic band at 1020 cm À1 was attributed to C-O stretching of the C-O-C group in the anhydroglucose ring of starch [19].…”

The effects of cross-linked starch on the properties of thermoplastic starch

“…The addition of a plasticizer can overcome the brittleness of the TPS and facilitates its processability [3]. Small molecules such as glycerol [4], sorbitol [5], ethanolamine [6], urea [7] and water [8] can be used as plasticizer but according to the literature glycerol is most commonly used. However, starch itself is unsuitable for use as a plastic because it shows poor physical and mechanical properties [9,10].…”

Preparation, Structure and Properties of Acid Aqueous Solution Plasticized Thermoplastic Chitosan

“…The latter method, namely thermo-mechanical mixing, is expected to overcome these shortcomings and thus to provide an ideal process technique to fabricate chitosan-based films. This technique has been successfully applied in the preparation of different plasticized polysaccharides (i.e., thermoplastic polysaccharides) such as starch [13,14] and sodium alginate [15]. However, like cellulose, chitosan exhibits a degradation temperature below its melting point.…”