Effects of Phase Morphology on Mechanical Properties: Oriented/Unoriented PP Crystal Combination with Spherical/Microfibrillar PET Phase

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.

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Poly(ethylene terephthalate) nanocomposites by in situ interlayer polymerization: the thermo-mechanical properties and morphology of the hybrid fibers

Polymer ◽

10.1016/j.polymer.2003.11.037 ◽

2004 ◽

Vol 45 (3) ◽

pp. 919-926 ◽

Cited By ~ 169

Author(s):

Jin-Hae Chang ◽

Sung Jong Kim ◽

Yong Lak Joo ◽

Seungsoon Im

Keyword(s):

Mechanical Properties ◽

Ethylene Terephthalate ◽

Hybrid Fibers ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene

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Morphology, static and dynamic mechanical properties of in situ microfibrillar composites based on polypropylene/poly (ethylene terephthalate) blends

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2007.11.008 ◽

2008 ◽

Vol 39 (2) ◽

pp. 164-175 ◽

Cited By ~ 92

Author(s):

K. Jayanarayanan ◽

Sabu Thomas ◽

Kuruvilla Joseph

Keyword(s):

Mechanical Properties ◽

Ethylene Terephthalate ◽

Dynamic Mechanical Properties ◽

Dynamic Mechanical ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene ◽

Microfibrillar Composites

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Compatibility Effect of Reactive Copolymers on the Morphology, Rheology, and Mechanical Properties of Recycled Poly(ethylene terephthalate)/Polypropylene Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.893.254 ◽

2014 ◽

Vol 893 ◽

pp. 254-258 ◽

Cited By ~ 2

Author(s):

Xin Tu Lin ◽

Qing Rong Qian ◽

Li Ren Xiao ◽

Qiao Ling Huang ◽

Li Zeng ◽

...

Keyword(s):

Mechanical Properties ◽

Impact Strength ◽

Glycidyl Methacrylate ◽

Ethylene Terephthalate ◽

Charpy Impact ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene ◽

Polypropylene Blends ◽

Pp Blends ◽

Charpy Impact Strength

Glycidyl methacrylate (GMA) grafted ethyleneoctene multi-block copolymer (OBC) in the presence of the styrene (St) monomer (OBC-g-(GMA-co-St)) was prepared and then used as a compatibilizer for recycled Poly (ethylene terephthalate)/Polypropylene (R-PET/PP) blends. The morphological, rheological and mechanical properties of the blends were investigated. The results show that the compatibilization between R-PET and PP blends is improved by the introduction of OBC-g-(GMA-co-St). The SEM results show that all R-PET/PP blends exhibit a matrix-dispersed droplet type morphology, and the addition of OBC-g-(GMA-co-St) results in a finer morphology and better adhension between the phases. In addition, the storage moduli (G'), loss moduli (G") and the Charpy impact strength of the blends increase with increasing OBC-g-(GMA-co-St) content, while the the flexural strength decreases slightly.

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Formation of high-density polyethylene–poly(ethylene-octene) core–shell particles in recycled poly(ethylene terephthalate) by reactive blending

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/1477760619843536 ◽

2019 ◽

Vol 35 (3) ◽

pp. 117-137

Author(s):

Yongjun Liu ◽

Ming Zhong ◽

Gang Liu ◽

Shouzhi Pu

Keyword(s):

Mechanical Properties ◽

High Density Polyethylene ◽

Ethylene Terephthalate ◽

Phase Morphology ◽

High Density ◽

Dispersed Phase ◽

Core Shell ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene ◽

Shell Particles

Recycled poly(ethylene terephthalate) (R-PET)/high-density polyethylene (HDPE)/glycidyl methacrylate grafted poly(ethylene-octene) (mPOE) blends, in which the binary (HDPE/mPOE) dispersed phase was of a HDPE core-mPOE shell structure, were prepared. For this purpose, HDPE-g-mPOE graft copolymers were prepared in HDPE/mPOE blends via reactive extrusion with the presence of the free radical initiator dicumyl peroxide (DCP). Then, R-PET was blended with the HDPE/mPOE blends by melt extrusion. The effect of the DCP and mPOE content in the HDPE/mPOE blends on the phase morphology and mechanical properties of the R-PET/HDPE/mPOE blends were studied systematically. It was found that the blends containing reactive compatibilizer exhibited the encapsulation of the HDPE by the mPOE, forming core–shell particles dispersed phase morphology. The graft chains of HDPE-g-mPOE-g-PET formed by the in situ reaction between R-PET and mPOE phases reduced the interfacial tension. Consequently, the dispersed phase morphology was observed to form smaller diameter core–shell particles. The resultant blends exhibited an effect on both the thermal and mechanical properties. Differential scanning calorimetric analysis showed the dispersed phase particles could act as a nucleating agent in the R-PET matrix to improve the crystallization temperature, while the graft copolymers formed in the compatibilized R-PET/HDPE/mPOE blend decreased the nucleation activity. Notched Charpy impact strength and elongation at break of the R-PET were improved by forming the core–shell particles dispersed phase morphology.

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Recycling of Mixed Poly(Ethylene-terephthalate) and Poly(Lactic Acid)

MATEC Web of Conferences ◽

10.1051/matecconf/201925302005 ◽

2019 ◽

Vol 253 ◽

pp. 02005

Author(s):

Daniel Gere ◽

Tibor Czigany

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Lactic Acid ◽

Impact Strength ◽

Ethylene Terephthalate ◽

Poly Lactic Acid ◽

Elongation At Break ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene ◽

Thermal Stability Of

Nowadays, PLA is increasingly used as a packaging material, therefore it may appear in the petrol-based polymer waste stream. However, with the today’s mechanical recycling technologies PLA and PET bottles cannot be easily or cheaply separated. Therefore, our goal was to investigate the mechanical, morphological and thermal properties of different PET and PLA compounds in a wide range of compositions. We made different compounds from poly(ethylene-terephthalate) (PET) and poly(lactic acid) (PLA) by extrusion, and injection molded specimens from the compounds. We investigated the mechanical properties and the phase morphology of the samples and the thermal stability of the regranulates. PET and PLA are thermodynamically immiscible, therefore we observed a typical island-sea type morphology in SEM micrographs. When PLA was added, the mechanical properties (tensile strength, modulus, elongation at break and impact strength) changed significantly. The Young’s modulus increased, while elongation at break and impact strength decreased with the increase of the weight fraction of PLA. The TGA results indicated that the incorporation of PLA decreased the thermal stability of the PET/PLA blends.

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