Tailoring PS/PP<sub>recycled</sub> blends compatibilized with SEBS. Evaluation of rheological, mechanical, thermomechanical and morphological characters

Luna, Carlos Bruno Barreto; Siqueira, Danilo Diniz; Araújo, Edcleide Maria; Wellen, Renate Maria Ramos

doi:10.1088/2053-1591/ab131c

Cited by 23 publications

(16 citation statements)

References 67 publications

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“…These observations support the conclusions from the morphological analysis, providing a blend composition with fine morphology, best homogeneity, and interfacial compatibility at K > 1. Similar results in G and G" were also reported while comparing un-compatibilized PS/PP blends to compatibilized PS/PP blends and upon reduction in particle size of the dispersed phase [84]. The complex viscosity (Figure 6c) for blends is significantly smaller than those for neat PS, possibly due to a slipping phenomenon between the phases [85].…”

Section: Rheological Propertiessupporting

confidence: 80%

Morphology, Rheology and Crystallization in Relation to the Viscosity Ratio of Polystyrene/Polypropylene Polymer Blends

et al. 2020

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Microfibrillar and droplet morphology of polypropylene (PP) phase dispersed in polypropylene (PS) was fabricated by using melt-extrusion. This morphology was obtained by introducing isotactic PP (20 wt.%) with different viscosity in the PS matrix (80 wt.%). Furthermore, the rheological properties of the blend investigated as a function of the viscosity ratio K. The variations in blend morphology were related to crystallization, melting properties, and viscoelasticity. The blends with K >> 1 develop a fine morphology with PP microfibrils along the flow direction, while diameters of the dispersed PP droplets gradually increase with lower values of K = 1, or K << 1. Crystallinity of the prepared blends significantly decreases compared to neat PP, while the microfibrillar morphology induces homogeneous crystallization with small crystallites. This is reflected in a decrease of the crystallization temperature, small loss in the crystallinity, and lower melting temperature of the PS80/PP20 blend compared to neat PP. The storage moduli, loss moduli, and complex viscosity are highest for the microfibrillar morphology that presents retarded relaxation. The rheological properties are dominated by the dispersed phase (K > 1), or matrix (K < 1). The variation in blend properties with microfibrillar morphology can be clearly distinguished from heterogeneous blends containing PP droplets, providing an efficient tool to create a binary blend with unique properties.

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Section: Rheological Propertiessupporting

confidence: 80%

Morphology, Rheology and Crystallization in Relation to the Viscosity Ratio of Polystyrene/Polypropylene Polymer Blends

et al. 2020

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“…This indicates the formation of strong networks in the polymer matrix leading to enhanced resistance against external forces at low frequencies due to a deviating relaxation process among dispersed particles. This is correlated with the presence of block copolymers and enhanced interfacial interaction [ 15 , 33 , 41 , 42 , 43 ]. Further, it can be seen that the elastic stress responses of SIS are more pronounced in the low frequency range for lower PS concentration compared to LUC while this behavior is kind of switched concerning PP–PS 75:25 blends.…”

Section: Results and Discussionmentioning

confidence: 99%

“…At higher concentrations, no more changes in the morphology could be observed which might be due to a certain saturation of the polymer system [ 28 , 29 ]. Despite the many studies that have been performed in this field and especially improvements in elongation at break and increase of impact toughness being reported by various authors for different methods [ 30 , 31 , 32 , 33 ], no direct comparison of reactive extrusion, non reactive and reactive copolymers has yet been provided for blends containing PP and PS.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Compatibilization Systems on the Rheological, Mechanical and Morphological Properties of Polypropylene/Polystyrene Blends

Seier¹,

Stanic²,

Koch³

et al. 2020

Polymers

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The influence of reactive processing, non reactive and reactive copolymers on immiscible polypropylene (PP)–polystyrene (PS) blends with varying PS concentrations (10 wt.% and 25 wt.%) was evaluated by mechanical (tensile and tensile impact), rheological (melt flow rate, extensional and dynamic rheology) and morphological (scanning electron microscopy) analysis. As an extended framework of the study, the creation of a link to industrial applicable processing conditions as well as an economically efficient use of compatibilzing agent were considered. For radical processed blends, a high improvement in melt strength was observed while non reactive copolymers exhibited a pronounced increase in toughness and ductility correlated with overall best phase homogeneity. Conversely, the influence of the reactive copolymer was quite different for the varied PS concentrations not allowing the assumption of a specific trend for resulting blend properties, but nevertheless in the case of a lower PS concentration the tensile impact strength exceeded the value of virgin PP. Since PS and PP are widely used, the findings of this work could not only be relevant for the generation of more versatile blends compared to virgin components but also for recycling purposes, allowing the enhancement of specific properties facilitating the production of more valuable secondary materials.

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“…where "DH m " is the melting enthalpy of the RPP, "W RPP " is the RPP weight fraction in the blend, and "DH 1 m " is the melting enthalpy of 100% crystalline RPP (209 J/g). 33 Scanning electron microscopy. The microscopy analysis was carried out with a scanning electron microscope (JEOL JSM 6060) operating at 10 kV.…”

Section: ð1:2þmentioning

confidence: 99%

Structure-property correlation of an impact- modified random polypropylene copolymer

Pereira

Bernardes

Silva

et al. 2020

Journal of Elastomers & Plastics

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The combination of rheological and interfacial properties is utilized in this work to explain the thermal and mechanical properties of a random polypropylene copolymer (RPP) toughened with an ethylene-propylene copolymer (EPR). RPP/EPR blends are directly prepared by injection molding. The EPR exhibits higher viscosity in comparison with the RPP over the evaluated shear rate, while the RPP/EPR blends show similar viscosities at high shear rates. The interfacial properties indicate a strong interaction between the RPP and EPR domains. Differential scanning calorimetry analyses indicate that the EPR does not act as a nucleating agent for the RPP, with the RPP crystallinity only decreasing at high EPR contents, suggesting that the EPR can modify the RPP crystallite size. Scanning electron micrographs of the blends demonstrate a ductile fracture surface, indicating that EPR can increase the RPP tenacity. The RPP impact strength is improved by up to 102% in the RPP/EPR 90/10 wt.% blend, while the RPP deformation at break is increased from 183% to 246% after the incorporation of 10% EPR. The tensile strengths of the RPP and RPP/EPR blends are very similar, indicating that the RPP achieves a good balance between stiffness and toughness after being blended with the EPR.

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Tailoring PS/PP_recycled blends compatibilized with SEBS. Evaluation of rheological, mechanical, thermomechanical and morphological characters

Cited by 23 publications

References 67 publications

Morphology, Rheology and Crystallization in Relation to the Viscosity Ratio of Polystyrene/Polypropylene Polymer Blends

Morphology, Rheology and Crystallization in Relation to the Viscosity Ratio of Polystyrene/Polypropylene Polymer Blends

Effect of Different Compatibilization Systems on the Rheological, Mechanical and Morphological Properties of Polypropylene/Polystyrene Blends

Structure-property correlation of an impact- modified random polypropylene copolymer

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Tailoring PS/PPrecycled blends compatibilized with SEBS. Evaluation of rheological, mechanical, thermomechanical and morphological characters

Cited by 23 publications

References 67 publications

Morphology, Rheology and Crystallization in Relation to the Viscosity Ratio of Polystyrene/Polypropylene Polymer Blends

Morphology, Rheology and Crystallization in Relation to the Viscosity Ratio of Polystyrene/Polypropylene Polymer Blends

Effect of Different Compatibilization Systems on the Rheological, Mechanical and Morphological Properties of Polypropylene/Polystyrene Blends

Structure-property correlation of an impact- modified random polypropylene copolymer

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Tailoring PS/PP_recycled blends compatibilized with SEBS. Evaluation of rheological, mechanical, thermomechanical and morphological characters