Effect of processing temperature and mixing time on the properties of PP/GnP nanocomposites

Botta, Luigi; Mantia, F. P. La; Ceraulo, M.; Mistretta, Maria Chiara

doi:10.1016/j.polymdegradstab.2020.109321

Cited by 11 publications

(5 citation statements)

References 42 publications

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“…For this reason, the incorporation of nanoparticles in a polymer matrix is often employed to enhance performance, and this has become an issue of interest in academia and industry [3,4]. In this respect, graphene has attracted a great deal of attention due to its capacity to improve the mechanical, thermal, and electrical properties of polymer nanocomposites and their behavior to thermomechanical and photooxidative degradation [5][6][7][8][9][10][11][12][13][14]. In addition, the presence of GnPs enhances the effect of elongated flow, which, consequently, improves mechanical properties with the draw ratio of nanocomposites compared to the matrix alone [9].…”

Section: Introductionmentioning

confidence: 99%

Morphology, Rheological and Mechanical Properties of Isotropic and Anisotropic PP/rPET/GnP Nanocomposite Samples

et al. 2021

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The effect of graphene nanoplatelets (GnPs) on the morphology, rheological, and mechanical properties of isotropic and anisotropic polypropylene (PP)/recycled polyethylene terephthalate (rPET)-based nanocomposite are reported. All the samples were prepared by melt mixing. PP/rPET and PP/rPET/GnP isotropic sheets were prepared by compression molding, whereas the anisotropic fibers were spun using a drawing module of a capillary viscometer. The results obtained showed that the viscosity of the blend is reduced by the presence of GnP due to the lubricating effect of the graphene platelets. However, the Cox–Merz rule is not respected. Compared to the PP/rPET blend, the GnP led to a slight increase in the elastic modulus. However, it causes a slight decrease in elongation at break. Morphological analysis revealed a poor adhesion between the PP and PET phases. Moreover, GnPs distribute around the droplets of the PET phase with a honey-like appearance. Finally, the effect of the orientation on both systems gives rise not only to fibers with higher modulus values, but also with high deformability and a fibrillar morphology of the dispersed PET phase. A fragile-ductile transition driven by the orientation was observed in both systems.

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Section: Introductionmentioning

confidence: 99%

Morphology, Rheological and Mechanical Properties of Isotropic and Anisotropic PP/rPET/GnP Nanocomposite Samples

et al. 2021

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“…However, some of the molecular chains of PP matrix began to degrade under the action of high temperature and shear force with the continued extension of time leading to reduction of the impact strength of I‐6. [ 44 ] For II‐6 composites, the impact strength of II‐6 does not change significantly with the extension of time because of the initial homogeneous mixing and the formation of a large amount of EVA‐LDH core‐shell structure. The gradual migration of LDH from PP matrix and interface to EVA phase with time leads to better toughening effect of its migrated phase structure compared with the degradation of molecular chain of PP, which finally results in the gradual improvement of impact strength for III‐6 composites.…”

Section: Resultsmentioning

confidence: 99%

Effect of selectively localized layered double hydroxide (LDH) nanosheet on microstructure, toughness, rheological, and crystallization behaviors of PP/EVA/LDH ternary composites

et al. 2023

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Polypropylene/ethylene vinyl acetate copolymer/layered double hydroxide (PP/EVA/LDH) ternary composites are fabricated by three different processing methods (Methods I, II, and III). The phase morphology distribution, mechanical toughness, rheological, and crystallization behaviors of PP/EVA/LDH ternary composites are investigated by scanning electron microscopy (SEM), Izod impact test, rheology, differential scanning calorimeter (DSC), and polarizing optical microscope. The theoretical calculation results of the wetting coefficient (ωa) show that LDH nanosheets are preferentially localized in the EVA phase. The cross‐sectional results combined with SEM show that the dispersion and phase morphology distribution of LDH are closely related to the kinetic parameter of the blending sequences. The possible phase distribution mechanism is elucidated accordingly. The II‐6c sample has a highest impact strength (4.8 kJ/m2) under the method II compared with that of PP (2.8 kJ/m2) and PP/EVA (4.1 kJ/m2), which shows a more excellent toughening effect due to the synergy of elasticity of EVA and localization of LDH. The DSC results show III‐6e sample has a highest crystallinity (61.8%) because of more well‐dispersed LDH localized in PP matrix phase, providing more crystallization nucleation sites under method III.

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“…9,12,17 The effect of processing conditions on the morphology of PP/GNP nanocomposites has also been studied. Botta et al 27 investigated the effect of processing temperature on PP/GNP nanocomposites with the addition of 1 and 2 wt% GNP. The authors observed that the addition of a smaller amount of GNP (1 wt%) contributed to better dispersion in the PP matrix and less thermal degradation during processing.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene/talc/graphene nanoplates (GNP) hybrid composites: Effect of GNP content on the thermal, rheological, mechanical, and electrical properties

Sarturato

Anjos

Marini

et al. 2023

J of Applied Polymer Sci

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Polypropylene (PP)/talc composites are used extensively in the automotive, aeronautical, and consumer goods industries; however, the increasing demand for more efficient, safe, and less environmentally impact materials makes it necessary to include new reinforcements. In this way, the use of graphene nanoplates (GNP) is a good alternative because this carbon‐based material allows the achievement of new multifunctional nanocomposites with improved properties and process optimization. In this work, PP/talc (80/20) composites were prepared with the addition of 1, 3, 5, and 7 wt% of GNP using the extrusion process and injection molding. Morphological, thermal, rheological, mechanical, electrical, and electromagnetic characterizations were performed. The addition of GNPs led to a linear reduction in the melt flow index (MFI) of the samples. A rheological percolation was observed in the sample with the addition of 7 wt% of GNP. The addition of 5 and 7 wt% of GNP led to significant increases in elastic modulus and Shore D hardness. The electrical and electromagnetic evaluation showed that the increase of GNP in the compositions contributed to improvements in electrical conductivity and permittivity, resulting in a proportional increment in the total attenuation component (SET).

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Effect of processing temperature and mixing time on the properties of PP/GnP nanocomposites

Cited by 11 publications

References 42 publications

Morphology, Rheological and Mechanical Properties of Isotropic and Anisotropic PP/rPET/GnP Nanocomposite Samples

Morphology, Rheological and Mechanical Properties of Isotropic and Anisotropic PP/rPET/GnP Nanocomposite Samples

Effect of selectively localized layered double hydroxide (LDH) nanosheet on microstructure, toughness, rheological, and crystallization behaviors of PP/EVA/LDH ternary composites

Polypropylene/talc/graphene nanoplates (GNP) hybrid composites: Effect of GNP content on the thermal, rheological, mechanical, and electrical properties

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