Abstract
Materials based on mixture of poly(butylene adipate-co-terephthalate) (PBAT) with thermoplastic starch (TPS) were investigated concerning mechanical properties and structure characterized by DMTA and SEM. TPS plasticized with two different plasticizers were tested, namely glycerol and urea. It was found that TPS with urea exhibits significantly higher tensile strength and modulus than TPS with starch plasticized by glycerol and this affects also the properties of mixtures PBAT/TPS. Tensile strength of mixtures containing 20% of both kinds of TPS is substantially lower than virgin PBAT but the strength for mixture with 50% of TPS with urea is approaching to the value for neat PBAT while the same content of TPS/glycerol leads to further decrease in stress. Differences in moduli for PBAT with TPS/urea and TPS/glycerol represent one order of magnitude. The reason for this behavior consists in much stronger interactions between urea and starch hydroxyl groups compared to glycerol resulting in prevention of void formation visible on fracture surfaces (SEM) and higher glass transitions temperature (DMTA).
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