Effects of Thermoplastic Starch Contents on the Properties of PBST Composites and Films
In order to study the influences of different thermoplastic starch(TPS)addition amount on the crystalline behaviors and film processing properties of polybutylene succinate-butylene terephthalate(PBST)/TPS blends,TPS was used as the filling component,PBST was used as the matrix,and then PBST/TPS composites were prepared by the melt blending method.The results show that the crystallization of PBST could be accelerated by TPS,but the crystallinity of PBST decreases with the increase of TPS content.With the increase of TPS content,the viscosity of the PBST/TPS composite increases and the flowability decreases.When the mass content of TPS is 40 parts,the rotatory and tensile rheological properties of the composites change dramatically.The composite films were produced by blow moulding.The crystallinity of PBST in the composite films reduces and the thickness stability of the films improves with few parts of TPS adding.However,when the mass content of TPS reaches 40 parts,the stability of blow moulding is reduced and the thickness uniformity of the film becomes worse again.The tensile strength of the film is reduced to only 33%of that of PBST film.In addition,with the increase of TPS content,the water absorption of the composite films increases gradually,and the transmittance of the films gets worse.
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