Study Of Structure And Properties Of PET/PE Belends

In this work, the recycled polyethylene terephthalate (PET)/recycled polyethylene (PE) was prepared by the method of melt blending and we studied the effect of the compatilizer type, dosage of compatilizer and PET/PE blend ratio on the performance of the blending alloy. the physical and mechanical properties of blending alloy were tested, morphology was observed by the scanning electron microscope (SEM) and crystallization behavior of blending alloy was studied by differential scanning calorimetry (DSC). The experimental results show that adding compatilizer can improve the impact strength of PET/PE blends effectively. The orthogonal experiment results show that the compatilizer type is the key factor that affect materials comprehensive performance and the optimum adding amount is 5 phr in the experimental range. With the increasing content of PE, all of PET/PE blend melt flow rate, tensile strength, bending strength and bending modulus show a trend of decrease, while elongation at break and impact strength are improved. Using the self-made compatilizer PTW-16, results show that the alloy melt flow rate is decreased obviously, the impact strength and elongation at break increased significantly and the biggest increase is 3.7 times and 6.9 times respectively. With the increasing content of compatilizer in the PET/PE blend, the impact toughness of alloy materials will be a further enhance, but not all physical and mechanical properties are same with the proportion of improvement trend, so the suitable dosage of compatilizer are used according to material the practical use and its performance index request, not the more the better. SEM analysis show that the addition of compatilizer, PET/PE Blends dispersed phase boundary become blurred, and rare microfiber structure were observed; DSC analysis show that the crystallization rate of PET in blends decrease with increase of the content of PE, PE crystallization rate increased significantly; and PTW-16 had no significant effect on compatibility of alloy crystallographic features.