Competition effect of shear‐induced nuclei and multiwalled carbon nanotubes (MWCNT) on β‐isotactic polypropylene (<i>i</i>PP) formation in preshear injection‐molded <i>i</i>PP/MWCNT nanocomposites

Chang, Baobao; Schneider, Konrad; Heinrich, Gert; Li, Yilong; Zheng, Guoqiang; Häußler, Liane; Liu, Chuntai; Shen, Changyu

doi:10.1002/pc.24650

Cited by 6 publications

(6 citation statements)

References 56 publications

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“…In previous studies, the heterogeneous nucleation ability of MWCNTs has been confirmed by some literature. 50,51 These scattered MWCNTs agglomerates, on the one hand, further increase the nucleation sites of PA66. On the other hand, they also hinder the growth of PA66 grains, making the grain size of PA66/MWCNTs-GF composites significantly smaller than that of pure PA66.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and thermal properties and crystallization behavior of PA66 composites reinforced with MWCNTs-coated milled glass fiber

Tong

Zhang

et al. 2020

High Performance Polymers

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Constructing a hierarchical structure of nanomaterials on the surface of reinforcing fibers is the best strategy to obtain other desired functions while improving the mechanical properties of polymers. In this article, acid-treated multiwall carbon nanotubes (MWCNTs) were introduced to the surface of milled glass fiber (MGF) under the combined action of tetraethyl orthosilicate and 3-aminopropyltriethyloxysilane to prepare a hierarchical fiber (MWCNTs-GF). The surface morphology and microstructure of this hierarchical fiber were characterized by field-emission scanning electron microscope and transmission electron microscope, and a composite coating with MWCNTs as the main component was observed on each fiber surface. Fourier transform infrared and Raman spectroscopy revealed the presence of the specific interactions between MWCNTs and MGF. Polyamide 66 (PA66) composites with different content of MWCNTs-GF were fabricated by melt blending. The resulting composites exhibited improved mechanical properties relative to pure PA66, in which the tensile strength and notched impact strength of the composite filled with 3 wt% MWCNTs-GF increased by 23.3% and 69.0%, respectively. Subsequently, by analyzing fracture morphology and interfacial adhesion of the composites, the strengthening and toughening mechanisms of MWCNTs-GF were elaborated in detail. In addition, the results of thermogravimetric analysis and differential scanning calorimetry showed that MWCNTs-GF possessed strong heterogeneous nucleation ability, and its addition could refine the grain size of PA66 and significantly increase the crystallization temperature and thermal stability of the corresponding composites. Compared to PA66 composites reinforced with neat MGF, it was found that the unique surface structure of MWCNTs-GF was likely responsible for improved thermal properties of this hierarchical fiber-reinforced PA66 composites.

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Section: Resultsmentioning

confidence: 99%

Mechanical and thermal properties and crystallization behavior of PA66 composites reinforced with MWCNTs-coated milled glass fiber

Tong

Zhang

et al. 2020

High Performance Polymers

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“…Melt extrusion molding is one of the most important polymer melt processing techniques by which common thermoplastic polymers can be processed into macrosized but microstructure controllable products. − More importantly, it shows facile, solvent-free, low-cost, high-efficiency, and large-scale features. In practice, targeted for specific practical applications, two immiscible polymers are usually melt blended by extruder, resulting in an immiscible heterogeneous biphase system.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Conductive Polymer Composites Based on High Density Polyethylene/Carbon Nanotube/Polyoxyethylene Mixtures for Microcircuits Interconnection and Organic Vapor Sensor

Shi

Liu

et al. 2019

ACS Appl. Nano Mater.

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Anisotropic conductive polymer composites (ACPCs) are of great significance; however it is still a huge challenge to prepare ACPCs via a continuous, low-cost but facile method. In this study, a facile “melt extrusion-calendering” method is proposed to prepare ACPCs based on high density polyethylene (HDPE)/carbon nanotubes (CNTs)/polyoxyethylene (PEO) composite system. An alternating microlayered structure with different polymer phases parallel to extrusion direction is developed, and CNTs are selectively localized in HDPE microlayers. Such interesting biphase structure endows the resulting composites with extraordinary anisotropic property. That is, both extrusion direction and width direction show good conductivity but thickness direction is insulative. The conductivity of such ACPCs in extrusion direction exhibits 6 orders of magnitude higher than that in thickness direction. Moreover, the anisotropy can be easily regulated from 104 to 106 by adjusting the stretching ratio. Interestingly, the as-prepared ACPCs can be used as reliable microcircuits interconnection and organic vapor sensor. This study will open the way to the facile preparation of anisotropic conductive nanomaterials and their wide potential applications.

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“…Among a variety of polymers filled with CNTs, isotactic polypropylene (iPP) is one of the most preferred thermoplastics that is commonly reinforced with CNTs [8,9,10]. It has been reported that mechanical properties of iPP such as tensile strength, modulus, and fracture toughness can increase dramatically at very low CNTs contents (<1%) [4,11], owing to the large nanocarbon/polymer interface arising from their high surface-to-volume ratio.…”

Section: Introductionmentioning

confidence: 99%

Structure and Mechanical Properties of Multi-Walled Carbon Nanotubes-Filled Isotactic Polypropylene Composites Treated by Pressurization at Different Rates

Jia

Dong

et al. 2019

Polymers

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Isotactic polypropylene filled with 1 wt.% multi-walled carbon nanotubes (iPP/MWCNTs) were prepared, and their crystallization behavior induced by pressurizing to 2.0 GPa with adjustable rates from 2.5 to 1.3 × 104 MPa/s was studied. The obtained samples were characterized by combining wide angle X-ray diffraction, small angle X-ray scattering, differential scanning calorimetry, transmission electron microscopy and atomic force microscopy techniques. It was found that pressurization is a simple way to prepare iPP/MWCNTs composites in mesophase, γ-phase, or their blends. Two threshold pressurization rates marked as R1 and R2 were identified, while R1 corresponds to the onset of mesomorphic iPP formation. When the pressurization rate is lower than R1 only γ-phase generates, with its increasing mesophase begins to generate and coexist with γ-phase, and if it exceeds R2 only mesophase can generate. When iPP/MWCNTs crystallized in γ-phase, compared with the neat iPP, the existence of MWCNTs can promote the nucleation of γ-phase, leading to the formation of γ-crystal with thicker lamellae. If iPP/MWCNTs solidified in mesophase, MWCNTs can decrease the growth rate of the nodular structure, leading to the formation of mesophase with smaller nodular domains (about 9.4 nm). Mechanical tests reveal that, γ-iPP/MWCNTs composites prepared by slow pressurization display high Young’s modulus, high yield strength and high elongation at break, and meso-iPP/MWCNTs samples have excellent deformability because of the existence of nodular morphology. In this sense, the pressurization method is proved to be an efficient approach to regulate the crystalline structure and the properties of iPP/MWCNTs composites.

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Competition effect of shear‐induced nuclei and multiwalled carbon nanotubes (MWCNT) on β‐isotactic polypropylene (iPP) formation in preshear injection‐molded iPP/MWCNT nanocomposites

Cited by 6 publications

References 56 publications

Mechanical and thermal properties and crystallization behavior of PA66 composites reinforced with MWCNTs-coated milled glass fiber

Mechanical and thermal properties and crystallization behavior of PA66 composites reinforced with MWCNTs-coated milled glass fiber

Anisotropic Conductive Polymer Composites Based on High Density Polyethylene/Carbon Nanotube/Polyoxyethylene Mixtures for Microcircuits Interconnection and Organic Vapor Sensor

Structure and Mechanical Properties of Multi-Walled Carbon Nanotubes-Filled Isotactic Polypropylene Composites Treated by Pressurization at Different Rates

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