Abstract
Five star-shaped poly (trimethylolpropane-succinic acid-ethylene glycol)s (PTSEs) with different chain length were prepared by a multi-step reaction, and then used as starch plasticizer. The structure of PTSE polyesters was characterized by Fourier transform infrared spectrum, 1H nuclear magnetic resonance and gel permeation chromatography, and the effects of PTSEs on the structure and properties of starch were studied by X-ray diffraction, rapid viscosity analysis, moisture absorption test, mechanical and thermal analysis. The PTSEs with longer chains could increase pasting temperature of starch and reduce the paste viscosity, but the defect in chain growth of PTSEs could hold back the effect severely. PTSEs resulted in more but weaker H-bonds in starch films. Longer chains in PTSE arms helped with the mechanical and hydrophobic properties, but was not conducive to the mechanical stability of the composite films. Meanwhile, the defect in chain growth may be a more unfavorable factor.
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