Influence of the HDPE molecular weight and content on the morphology and properties of the impact polypropylene copolymer/HDPE blends

Liu, Xuanbo; Miao, Xiaopei; Guo, Mei; Song, Wenbo

doi:10.1039/c5ra08517a

Cited by 10 publications

(7 citation statements)

References 44 publications

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“…The effect of microstructure on polymer properties has been extensively studied [26,27,28]. It is widely accepted that morphological analyses, such as geometric analysis of dispersed phase and morphological analysis of the interface between matrix and dispersed phase, are helpful in analyzing the mechanical properties of polymer blends [29,30].…”

Section: Resultsmentioning

confidence: 99%

Blends of rABS and SEBS: Influence of In-Situ Compatibilization on the Mechanical Properties

Zhan

Zhu

et al. 2019

Materials

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In this study, the in-situ compatibilization reaction between recycled acrylonitrile–butadiene–styrene copolymer (rABS) and functional styrene–ethylene–butylene–styrene block maleic anhydride (SEBS-g-MAH) was confirmed, which contributed to the toughening phenomenon of rABS, especially the notched impact strength. As mechanical test that manifested, the rABS/SEBS-g-MAH blends are stronger and more ductile than the rABS/SEBS blends. Prominently, the former has great advantage over the latter in terms of improving the impact performance. Scanning electron microscope (SEM) images showed that the compatible segments that were generated by reaction not only improve the interface adhesion of rABS/SEBS-g-MAH blends but also promote the evolution of co-continuous structures, which can be evidently observed after etching. Furthermore, the SEM micrographs of tensile fracture surfaces indicated that the formation of the co-continuous phase and the improvement of interface adhesion are the most profound reasons for the excellent tensile properties of the rABS/SEBS-g-MAH blends. The impact fracture surface revealed that two-phase interface affects crack propagation and shear yielding absorbs more impact energy than simple interface debonding does at higher deformation rates. Meanwhile, rheological analysis demonstrated that the complex viscosity of the rABS/SEBS-g-MAH (80/20 wt%) blend with a co-continuous structure exhibits a maximum positive deviation at low frequencies from the theoretical value calculated using the rule of logarithmic sum, which indicated a connection between co-continuous structure and complex viscosity. In addition, the storage modulus vs. loss modulus curves of the blends revealed that the viscoelastic behavior of rABS/SEBS-g-MAH blends is very similar to that of rABS.

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Section: Resultsmentioning

confidence: 99%

Blends of rABS and SEBS: Influence of In-Situ Compatibilization on the Mechanical Properties

Zhan

Zhu

et al. 2019

Materials

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“…Microscopic morphology is a crucial quantity for analyzing the compatibility of blends 37–39 . According to investigation, the size and distribution of the dispersed phase in the blend have a direct impact on the mechanical properties 40 .…”

Section: Resultsmentioning

confidence: 99%

Recycled polyethylene/polyethylene‐ethylene‐1‐octene‐maleic anhydride composite with improved mechanical properties

Wang

Gao

et al. 2021

J of Applied Polymer Sci

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Owing to the thermomechanical degradation and impurities, the high‐value utilization of waste packaging plastics is still a great challenge. In this work, we confirmed that the major sort of impurity in waste polyethylene (PE) packing films is calcium carbonate. Consequently, PE/poly(ethylene‐co‐1‐octene)‐maleic anhydride (rPE/POE‐g‐MAH) and poly(ethylene‐co‐1‐octene) (rPE/POE) composites were recycled using a custom‐made three‐screw extruder, who can supply intensive shear flow during extrusion. The POE‐g‐MAH is detected to be filled between PE and inorganic impurities, and the compatibility is improved through chemical reactions. As mechanical test manifested, the rPE/POE‐g‐MAH blends present higher tensile strength and elongation at break than the rPE/POE blends at the same composition. The reason for such improved toughness of composite was explained in detail through the tensile fracture surface analysis. Rheology test further shows that POE‐g‐MAH improves the compatibility of matrix and impurities. In summary, this article provides a sustainable route for enhancing the poor ductility of recycled express bags in a simple and economical way, which could pave an avenue for high‐value utilization of waste packaging plastics. At the same time, it also provides new solutions for material selection in packaging, construction, agriculture and other fields.

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“…It is expected that the i PP regions close to the dispersed domains are more concentrated with ethylene. Moreover, because nucleation is favored at the interface, the increase ethylene content in this region will lower nucleation density and the overall crystallization of IPC. − …”

Section: Resultsmentioning

confidence: 99%

Influence of Chain Microstructure on Liquid–Liquid Phase Structure and Crystallization of Dual Reactor Ziegler–Natta Made Impact Propylene–Ethylene Copolymers

Santonja-Blasco

Rungswang

Alamo

2017

Ind. Eng. Chem. Res.

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The relationship between ethylene content, phase structure, crystallization behavior, and the inferred mechanical performance has been studied in five impact copolymers with overall ethylene content between 8 and 11 mol %. Thermal characterization data and crystallization kinetics of impact polypropylene copolymers (IPC) do not scale with content of ethylene. Emphasis is given to understand the correlation between heterophasic morphology assessed by scanning electron microscopy and polarized optical microscopy and the properties of the crystalline propylene–ethylene copolymer component extracted via fractionation. As the mass fraction of the rubber component is equivalent for all IPC, the scaling between ethylene content and increased droplet size is explained by the observed differences in dynamics of the crystalline ethylene–propylene copolymer molecules during the liquid–liquid phase separation step. On this basis, a correlation is inferred between cocrystallization and compatibility of the components that make the observed multiphase morphologies and the IPC mechanical behavior.

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Influence of the HDPE molecular weight and content on the morphology and properties of the impact polypropylene copolymer/HDPE blends

Abstract: The properties of the polyolefins blends depend not only on composition but also on morphology.

Cited by 10 publications

References 44 publications

Blends of rABS and SEBS: Influence of In-Situ Compatibilization on the Mechanical Properties

Blends of rABS and SEBS: Influence of In-Situ Compatibilization on the Mechanical Properties

Recycled polyethylene/polyethylene‐ethylene‐1‐octene‐maleic anhydride composite with improved mechanical properties

Influence of Chain Microstructure on Liquid–Liquid Phase Structure and Crystallization of Dual Reactor Ziegler–Natta Made Impact Propylene–Ethylene Copolymers

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