Abstract
Thermoplastic starch/butyl glycol ester copolymer/polylactic acid (TPS/PBSA/PLA) biodegradable composites were prepared by melt-mixing. The structure, microstructure, mechanical properties and heat resistance of the TPS/PBSA/PLA composites were studied by Fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), tensile test and thermogravimetry tests, respectively. The results showed that PBSA or PLA could bind to TPS by hydrogen bonding. SEM analysis showed that the composite represents an excellent dispersion and satisfied two-phase compatibility when the PLA, TPS and PBSA blended by a mass ration of 10, 30, and 60. The mechanical properties and the heat resistance of TPS/PBSA/PLA composite were improved by adding PLA with content less than 10%, according to the testing results.
Highlights
Starch, the second largest natural polymer on earth, is widely synthesized by plants.Due to the renewable, biodegradable resource and low price, starch is widely used in the manufacturing industry for food, medicine, plastic and chemical packaging [1–6].At present, the production of starch degradable plastics accounts for more than 60% of the total production of degradable plastics [7–11]
The materials for the preparation of Thermoplastic starch (TPS)/PBSA/polylactic acid (PLA) biodegradable composite are corn starch, glycerin from Tianjin Sitong Chemical Plant, PBSA with the melt flow rate (190 ◦ C, 2.16 kg) of 2.4 g/10 min is purchased from Kingfa Sci. & Tech
As presented in the spectra of TPS/PBSA composites, several absorption peaks raised at 500–800 cm−1 and became stronger with the increase of the TPS content, which indicated that PBSA broke the symmetry of single rings in starch
Summary
The second largest natural polymer on earth, is widely synthesized by plants.Due to the renewable, biodegradable resource and low price, starch is widely used in the manufacturing industry for food, medicine, plastic and chemical packaging [1–6].At present, the production of starch degradable plastics accounts for more than 60% of the total production of degradable plastics [7–11]. The second largest natural polymer on earth, is widely synthesized by plants. Biodegradable resource and low price, starch is widely used in the manufacturing industry for food, medicine, plastic and chemical packaging [1–6]. The production of starch degradable plastics accounts for more than 60% of the total production of degradable plastics [7–11]. Natural starch is a polyhydroxy compound, and the adjacent molecules interact with each other by hydrogen bonds to form complete particles with a microcrystalline structure, which contributes to poor processing and mechanical properties [12–17]. Thermoplastic starch (TPS) is a mixture of starch and plasticizer, which acts thermal plasticity and shear effect at high-temperature. The products of TPS possess high hygroscopicity, awful heat tolerance, and poor dimensional stability, which restricts the use of TPS vastly
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