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Maleic anhydride (MAH) grafting onto isotactic polybutene-1 (iPB-1) was prepared using di-tert-butyl peroxide (DTBP) as the initiator in the internal mixer. The influence of the reaction temperature, rotor rate, initiator content, monomer and co-monomer content, on grafting ratio (G/%) and melt flow rate (MFR), was investigated. The results showed that the temperature and rotor rate had little effect on the grafting ratio and MFR when the temperature was 160°C–200°C, and the rotor rate was 50 rpm–90 rpm. Besides, as the initiator content increased, the grafting ratio increased, but excessive initiator content led to degradation of macromolecules and a significant increase in MFR. The grafting ratio reached a peak value with an MAH content of 4.5 phr and a fixed initiator content of 0.3 phr. As a co-monomer, styrene (St) can enhance the G/% and decrease the MFR. The crystallization properties of iPB-1 were also studied. The grafting of MAH onto iPB-1 remarkably accelerated the crystal form II to I transformation of iPB-1 and the transformation rate increased with an increase in the G/% of iPB-1.

Study on DTBP initiated MAH onto polybutene-1 with melt-grafting