| In this work, the r-PET/TPEE blends and r-PET/MBS blends compatibilized with different compatibilizers were obtained by melt-extrusion method. Then the effect of different compatibilizers on the mechanical performance, interfacial properties, melt and crystallization properties, rheological properties and dynamic modulus of r-PET/TPEE and r-PET/MBS blends was investigated.The results showed that:The notched impact strength and elongation at break of r-PET/TPEE blend with16%TPEE were increased by26.74%and170.35%than r-PET, but the strength of bending and tensile was decreased. SEM results showed that the TPEE particles embed in the r-PET matrix well and the interface bond was enhanced in the case of r-PET/TPEE/EAA blend with5%EAA. The torque and viscosity, loss modulus and storage modulus of r-PET/TPEE blend were decreased by adding5%EAA. Compared with r-PET, the melting temperature and undercooling of r-PET/TPEE blend with5%EAA were decreased by9.40℃and11.84℃, at the same time the crystallization temperature was increased by2.44℃. When adding5%EAA, the notched impact strength and elongation at break of r-PET/TPEE/EAA blend were increased by96.34%and183.92%than r-PET, respectively. In the case of r-PET/TPEE/LDPE-g-AA blend with3%LDPE-g-AA, the notched impact strength was increased by98.53%than r-PET, and the bending strength and storage modulus were declined slightly. Compared with r-PET, the ternary blend containing3%LDPE-g-AA showed the best toughening effect.In the r-PET/MBS blends, the notched impact strength was increased firstly and then dropped with the increase of MBS. When adding15%and25%MBS, the notched impact strength of r-PET/MBS blend were increased by53.85%and104.0%than r-PET, respectively. The adding of SEBS-g-MAH resulted in the melting temperature, the crystallization temperature and the crystallinity of r-PET/MBS blends being decreased. The dynamic rheological test indicated that the dynamic storage modulus, loss modulus and dynamic complex viscosity of r-PET/MBS/SEBS-g-MAH blends were higher than that of the uncompatibilized one and the blend with2%SEBS-g-MAH reached the maximum. SEM results showed that the particle size of dispersed phase was very tine and the particle distribution was uniform by adding2%SEBS-g-MAH into the blend. At the same time, the notched impact strength of r-PET/MBS blend with2%SEBS-g-MAH reached the maximum10.77kJ/m2.Compared with r-PET, the crystallinity of r-PET/MBS/E-MA-GMA blends were decreased along with the adding of E-MA-GMA. The dynamic storage modulus and complex viscosity of r-PET/MBS/E-MA-GMA blends were increased gradually with the increase of E-MA-GMA, which resulted in the increase of the viscosity of melt blend system. The research made clear that the notched impact strength of r-PET/MBS/E-MA-GMA blend with4%E-MA-GMA was increased3.75times than that of the uncompatibilized r-PET/MBS blend and increased6.31times than that of r-PET, which showed significant toughness. |
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