Abstract
The melt grafting of maleic anhydride (MAH) onto poly (3-hydroxybutyrate-co-4-hydrox-ybutyrate)[P(3HB-co-4HB)]/polylactic acid (PLA) blends were carried out via reactive extrusion. The effects of the contents of MAH, initiator (BPO) on the graft ratio were studied. The effects of grafting modification on thermal properties, mechanical properties, fracture morphology and compatibility of P(3HB-co-4HB)/PLA blends were characterized by differential scanning calorimeter (DSC), electronic universal testing machine and scanning electron microscopy (SEM) etc. The results showed that the graft ratio of blends increased to a maximum and then decreased with increasing contents of MAH and BPO; The tensile strength, impact strength of blends were significantly improved, and the graft ratio achieved the maximum value at 1.0phr MAH and 0.3phr BPO; Through analysis from DSC and SEM, it indicated that the compatibility of P(3HB-co-4HB)/PLA blends was improved effectively.
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