Abstract
Composite films of polybutylene adipate terephthalate (PBAT) were prepared by adding thermoplastic starch (TPS) (TPS/PBAT) and nano-zinc oxide (nano-ZnO) (TPS/PBAT/nano-ZnO). The changes of surface morphology, thermal properties, crystal types and functional groups of starch during plasticization were analyzed by scanning electron microscopy, synchronous thermal analysis, X-ray diffraction, infrared spectrometry, mechanical property tests, and contact Angle and transmittance tests. The relationship between the addition of TPS and the tensile strength, transmittance, contact angle, water absorption, and water vapor barrier of the composite film, and the influence of nano-ZnO on the mechanical properties and contact angle of the 10% TPS/PBAT composite film. Experimental results show that, after plasticizing, the crystalline form of starch changed from A-type to V-type, the functional group changed and the lipophilicity increased; the increase of TPS content, the light transmittance and mechanical properties of the composite membrane decreased, while the water vapor transmittance and water absorption increased. The mechanical properties of the composite can be significantly improved by adding nano-ZnO at a lower concentration (optimum content is 1 wt%).
Highlights
Plastic products have the advantages of light weight, beneficial mechanical properties, and excellent water resistance; their use is a double-edged sword
Our research aims at studying the effect of cassava starch after plasticizing with glycerin and organic acids, investigating the optimal blending ratio of plasticized starch and Polybutylene adipate terephthalate (PBAT), exploring the effect of nano-zinc oxide on the mechanical properties of thermoplastic starch (TPS)/PBAT, and determining the optimum amount of nano-zinc oxide of the composites
The polyethylene glycol (200) was used as a compatibilizer and nano-zinc oxide particles were added to the composite for the purpose of investigating the mechanical properties of TPS/PBAT/nano-ZnO composites
Summary
Plastic products have the advantages of light weight, beneficial mechanical properties, and excellent water resistance; their use is a double-edged sword. Major studies have adopted the method of adding a compatibilizer to improve the compatibility of starch with PBAT, such as the use of organic acid through an esterification reaction to replace starch surface hydroxyl, increase starch lipophilic and improve material properties [16,17,18]. Ren et al.’s results suggest that addition of solvent and anhydride greatly improved the compatibility between starch and PBAT blend interface, and greatly improved the mechanical properties of the TPS/PBAT composite [19]. Our research aims at studying the effect of cassava starch after plasticizing with glycerin and organic acids, investigating the optimal blending ratio of plasticized starch and PBAT, exploring the effect of nano-zinc oxide on the mechanical properties of TPS/PBAT, and determining the optimum amount of nano-zinc oxide of the composites. The polyethylene glycol (200) was used as a compatibilizer and nano-zinc oxide particles were added to the composite for the purpose of investigating the mechanical properties of TPS/PBAT/nano-ZnO composites
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