Poly(butanediol succinate-co-1,5-pentanediol succinate)(PBST)was synthesized by direct esterification and melt polycondensation,and biodegradable PBS/PBST blends were prepared by melt blending with PBST and PBS resin.The influence of PBST on the mechanical properties,crystallization behavior,and morphology of PBS blends were systematically investigated and discussed.The results showed that the chemical structure of PBST was confirmed by FTIR and 1H-NMR.With the increasing of PBST amount,the impact strength of PBS blends first raised and then declined,and when PBST amount was the value of 5％,the impact strength reached 71 J/m,improved by 51.1％.It was indicated that the crystallization temperature and crystallinity of the PBS blends rose by 13.6％and declined by 12.5％respectively compared with that of pure PBS,which was caused by the fact that PBST played the role of nucleation.SEM revealed the toughness of PBS blends was enhanced by the presence of stress whitening in the impact notched section of the samples.
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