Study On Preparation And Properties Of PTW Reactive Compatibilization PP/PET Blends

Shape memory polymer acts as a type of functional material. In this paper, PP/PET/PTW blends were prepared by melting blending and using ethylene-butyl acrylate-glycidyl methacrylate copolymer(PTW) as reactive compatibilizer. The effect of PTW content on phase morphology, shape memory, mechanical, crystallization, rhelolgical, and thermal properties of PP/PET (85/15) blends were studied by scanning electron microscope (SEM), differential scanning calorimeter (DSC), polarized optical microscopy (POM), X-ray diffraction (XRD), mechanical testing machines, capillary rheometer, fourier transform infrared spectroscopy (FTIR), and so on.The results show that, PTW has better compatibilization effect for PP/PET blends, a small amount of PTW could obviously improve the compatibility between PP and PET, make PET dispersing and disintegrating, reduce interfacial tension, and improve two phase interface bonding.PET has heterogeneous nucleation effect on PP, which could improve crystallizability of PP. PTW could improve the interaction of PP/PET blends, decrease the crystallization of PP, while the crystalline structure of PP was not changed.The results of FTIR show that, the epoxy group of PTW occurs a ring-opening reaction with the end groups of PET, and Ethylene chain segments of PTW exist a interaction with the PP matrix of the blends, both manifest that PTW is useful to improve the compatibility of the blends.Meanwhile, the results of shape memory test show that when the stretch ratio is 80%, response temperature is 170℃, recovery time is 120s, stretching temperature is 165℃, PP/PET/PTW (85/15/1) blend achieves the best thermostimulative shape memory effect. The shape recovery ratio and fixity ratio achieve 97.5% and 98.85%, respectively.PTW could greatly enhance the elongation at break and notched impact strength of the blends. The fracture mechanics of the blends were carried by J-integral, the resistance to crack initiation (Jc), the resistance to steady state crack propagation (Rp) and the resistance to crack growth at maximum load (Rmax) were estimated. PTW also could improve the resistance to crack fracture properties of the blends.PTW could shorten the plasticizing time and improve the processability of the blends. While PTW has little effect on heat resistance.