Effect of carbon nanotube addition on structure and properties for extrudates of high‐density polyethylene

Nishikawa, Riho; Yamaguchi, Masayuki

doi:10.1002/app.48010

Cited by 14 publications

(8 citation statements)

References 43 publications

(69 reference statements)

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“…Homogeneous mixing of an ultrahigh molecular weight fraction and/or crosslinked fraction is, in general, difficult, especially by melt blending. However, fibrous materials having nucleating activity for crystallization are also found to act as shish; that is, as a precursor for flow‐induced crystallization 17–22 . One example is the addition of carbon nanotubes (CNT) to polyethylene (PE) 17,21 .…”

Section: Introductionmentioning

confidence: 99%

“…However, fibrous materials having nucleating activity for crystallization are also found to act as shish; that is, as a precursor for flow‐induced crystallization 17–22 . One example is the addition of carbon nanotubes (CNT) to polyethylene (PE) 17,21 . CNTs show strong nucleating activity for PE 23 and orient to the flow direction, 24 so a crystalline structure similar to that of the shish‐kebab is easily formed.…”

Section: Introductionmentioning

confidence: 99%

“…This is referred to as a ‘nanohybrid shish‐kebab’ 17 . Owing to a well‐developed shish‐kebab structure, the modulus of PE is greatly enhanced with even a small amount of CNT 21 …”

Section: Introductionmentioning

confidence: 99%

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Modulus enhancement of polypropylene by sorbitol nucleating agent in flow field

Iwasaki

Inoue

Takei

et al. 2020

Polymer Crystallization

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The rigidity of an injection‐molded isotactic polypropylene (PP) containing 1,3:2,4‐bis‐o‐(4‐methylbenzylidene)‐D‐sorbitol (MDBS) as a crystal nucleating agent can be enhanced by selection of appropriate processing conditions. A new method by differential scanning calorimetry measurements showed that the dissolution temperature of 0.4 wt.% MDBS in molten PP is around 210°C. When injection molding was performed below the dissolution temperature, for example, 190°C, the molecular orientation of PP was greatly enhanced. Although this is an anomalous condition for the system to expect good transparency, the product obtained showed a high flexural modulus. In contrast, with high‐temperature processing at 240°C, that is, conventional condition, the modulus decreased because of poor molecular orientation. Transmission electron microscopy observation revealed that MDBS fibrils strongly orient to the flow direction under the low‐temperature processing, in which network structure of MDBS fibers is not detected. The oriented MDBS fibers led to a well‐developed shish‐kebab structure, which is responsible for the pronounced rigidity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modulus enhancement of polypropylene by sorbitol nucleating agent in flow field

Iwasaki

Inoue

Takei

et al. 2020

Polymer Crystallization

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“…Polyethylene is one of the most common low cost, high‐molecular‐weight, high‐performance thermoplastic polymers that possess high chemical inertness, good chemical resistant and dielectric properties, and excellent mechanical properties over a wide temperature range . However, polyethylene is generally a soft material because its structure contains many flexible chains, and then cannot be employed in many engineering applications where high stiffness and strength are required.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of high mechanical performance UHMWPE nanocomposites with high‐loading multiwalled carbon nanotubes

Wang

Zheng

Chen

et al. 2019

J of Applied Polymer Sci

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Using conventional mixing techniques, the mechanical properties of prepared carbon nanotube (CNT)/polymer composites are not impressive enough, because of their aggregation problem at a high loading of CNTs. In this article, high mechanical performance ultrahigh molecular weight polyethylene (UHMWPE) nanocomposites with high loading of multiwalled CNTs were successfully fabricated by a new manufacturing technique. Specifically, the tensile strength and storage modulus at 25 C of UHMWPE nanocomposites with 32 wt % of nanotubes prepared by the novel technique reaches 107.6 MPa and 6.0 GPa, respectively, about 4.7 times and 5.0 times of that of pure UHMWPE resin, which are also very high experimental results compared with polyethylene nanocomposite prepared by traditional hot-compression techniques. These attractive results suggest that the high-loading CNTs without sacrificing their dispersion and the impregnation quality of polymer-impregnated buckypapers are essential for fabricating CNTs/polymer composites with superior mechanical properties.Recently, macroscopic structures in the form of fiber or membranes provide a practical venue to overcome the dispersion problem of CNTs at high loading. 12,13 Wang et al. developed a new technique to manufacture high performance nanocomposites with high loading of CNTs: the CNTs are first assembled to nonwoven CNTs membranes, which are also named as buckypapers, consisting on entangled CNTs networks having a highly porous mesh structure, and then be permeated by epoxy to attain controllable reinforcement dispersion and high loading levels. 14 To date, many reports successfully employ buckypapers as reinforcements in thermoplastic resin, such as polycarbonate, poly(ether ether ketone), and polyamide by using simple manufacturing Additional Supporting Information may be found in the online version of this article.

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“…The T c seems to be slightly higher than that of pure UHMWPE. This will be owing to the strong nucleating ability of CNTs …”

Section: Resultsmentioning

confidence: 99%

Carbon nanotube localization at interface in cocontinuous blends of polyethylene and polycarbonate

Nishikawa

Tamaki

Notoya

et al. 2019

J of Applied Polymer Sci

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A new technique to show good electroconductivity was proposed using carbon nanotube (CNT) localization in cocontinuous immiscible polymer blends comprising ultrahigh-molecular-weight polyethylene (UHMWPE) and polycarbonate (PC). When UHMWPE was added to PC/CNT in the molten state in an internal mixer, CNTs started moving to the UHMWPE phase. However, CNTs require a long time to diffuse into the UHMWPE phase owing to a low diffusion constant. Consequently, they remain at the interface between PC and UHMWPE. When the blends have cocontinuous structure, the localized CNTs at the phase boundary act as a conductive path, leading to a good electroconductivity. Although a similar morphology is obtained by adjusting the balance of interfacial tensions among polymers and CNT, it is difficult to find a system showing appropriate interfacial tensions. As the present method is applicable to various polymer blends, it will be an important technique to prepare a conductive nanocomposite.

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Effect of carbon nanotube addition on structure and properties for extrudates of high‐density polyethylene

Cited by 14 publications

References 43 publications

Modulus enhancement of polypropylene by sorbitol nucleating agent in flow field

Modulus enhancement of polypropylene by sorbitol nucleating agent in flow field

Fabrication of high mechanical performance UHMWPE nanocomposites with high‐loading multiwalled carbon nanotubes

Carbon nanotube localization at interface in cocontinuous blends of polyethylene and polycarbonate

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