Abstract
In situ microfibrillation and multiflow vibrate injection molding (MFVIM) technologies were combined to control the phase morphology of blended polypropylene (PP) and poly(ethylene terephthalate) (PET), wherein PP is the majority phase. Four kinds of phase structures were formed using different processing methods. As the PET content changes, the best choice of phase structure also changes. When the PP matrix is unoriented, oriented microfibrillar PET can increase the mechanical properties at an appropriate PET content. However, if the PP matrix is an oriented structure (shish-kebab), only the use of unoriented spherical PET can significantly improve the impact strength. Besides this, the compatibilizer polyolefin grafted maleic anhydride (POE-g-MA) can cover the PET in either spherical or microfibrillar shape to form a core–shell structure, which tends to improve both the yield and impact strength. We focused on the influence of all composing aspects—fibrillation of the dispersed PET, PP matrix crystalline morphology, and compatibilized interface—on the mechanical properties of PP/PET blends as well as potential synergies between these components. Overall, we provided a theoretical basis for the mechanical recycling of immiscible blends.
Highlights
Polypropylene (PP) and polyethene terephthalate (PET) are among the most frequently used semi-crystalline polymers, accounting for nearly 30% of all plastics used in Europe [1]
PP/poly(ethylene terephthalate) (PET) blends werethe prepared by different the mechanical properties of PP/PET
Four types of PP/PET blends were prepared by different extrusion and injection methods
Summary
Polypropylene (PP) and polyethene terephthalate (PET) are among the most frequently used semi-crystalline polymers, accounting for nearly 30% of all plastics used in Europe [1] They are commonly used in consumer goods, car parts, packaging, and textiles [2,3]. Both polymers are used in applications where they are physically fused together in order to combine some of the important characteristics of each component Examples of this include industrial carpet, which contains PET yarns physically attached to a PP melt backing [4], and multilayer food packaging, in which PET provides barrier properties and laminated PP provides water resistance as well as sealing ability [4]. Such blends are typically inferior in terms of material properties, and, it is common to incinerate them for energy recovery rather than
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