Designer petals shape ZnO nanoparticles as nucleating agents: Verification the mechanism of cavity nucleation in the polymer for foaming

Liu, Bujin; Gu, Jie; Jiang, Tuanhui; Deng, Rong; Yang, Jian; Zeng, Xiangbu; Zhang, Chun; He, Li; Gong, Wei

doi:10.1016/j.polymertesting.2021.107398

Cited by 7 publications

(7 citation statements)

References 43 publications

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“…Therefore, they provide a large number of nucleation sites favorable for heterogeneous nucleation. During foaming, the energy barrier of cell nucleation at the interface is reduced, and it is easier for the cells to form at the interface, so as to achieve better foaming effect 30 . For foaming materials, the higher the cell density and the smaller the size, the more significant the lightweight effect, and the better the overall performance.…”

Section: Resultsmentioning

confidence: 99%

“…During foaming, the energy barrier of cell nucleation at the interface is reduced, and it is easier for the cells to form at the interface, so as to achieve better foaming effect. 30 For foaming materials, the higher the cell density and the smaller the size, the more significant the lightweight effect, and the better the overall performance. Due to the low density and small cell size of the PA6/CF composite foams and the cells are distributed in the matrix material as a small-sized 3D defect, the continuous distribution of the material medium was altered.…”

Section: Foaming Performance Of Pa6/cf Composite Foamsmentioning

confidence: 99%

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High strength and light weight polyamide 6/carbon fiber composite foams for electromagnetic interference shielding

Zhu

Jiang

Zeng

et al. 2023

J of Applied Polymer Sci

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In this study, high strength and light weight polyamide 6/carbon fiber (PA6/CF) composite foams were prepared by chemical injection foaming method. The foaming performance, electromagnetic interference (EMI) shielding efficiency total(SE T ), and mechanical properties of PA6/CF composite foams with different CF contents were investigated. The results show that the shear viscosity and strain hardening behavior obvious increased with the augment of CF content, which helped to PA6/CF composite foams to take the cell structure with smaller size, greater density, and more regular morphology.PA6/CF composite foam with cell size of 56.8 μm, and cell density of 1.81 Â 10 6 cells/cm 3 was achieved at 22 wt% CF. Meanwhile, PA6/CF composite foam had good EMI SE T , at 22 wt% CF addition. The specific EMI SE T of PA6/CF composite foam is 36.6 dB, 27.6% higher than that of solid 26.5 dB, the excellent cell structure helps to improve the EMI SE T . In addition, PA6/CF composite foams also had excellent mechanical properties. Therefore, PA6/CF composite foams had broad application prospect in EMI shielding materials field, combining the advantages of simple preparation process, light weight and EMI shielding.

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Section: Resultsmentioning

confidence: 99%

Section: Foaming Performance Of Pa6/cf Composite Foamsmentioning

confidence: 99%

High strength and light weight polyamide 6/carbon fiber composite foams for electromagnetic interference shielding

Zhu

Jiang

Zeng

et al. 2023

J of Applied Polymer Sci

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“…By increasing the surface roughness of nanoparticles and grafting CO 2 -philic materials, Liu et al 21,22 increased the nucleation effect of the nucleating agent. The previous work of the research group 15,23 proposed and verified the cavity nucleating mechanism based on the fact that it is difficult to entirely encrust nucleating agent particles with resin, resulting in small cavities. In fact, larger cavities are easy to be used as defects to damage material properties, while smaller cavities are ineffective for nucleation.…”

Section: Introductionmentioning

confidence: 99%

“…R cr * represents the critical radius of cell nucleation, and the details are given in the Supporting Information (Figure S1)). There are mainly four ways to increase cell density, including increasing gas concentration, , boosting the pressure relief rate, − introducing the strain energy, − and adding impurities as nucleating agents to the system. , Among these methods mentioned above, the addition of nucleating agents is one of particular interest, which is ascribed to low equipment requirements as well as to the inexpensive cost. Silica nanoparticles are particularly appealing as impurity nucleation sites in plastic foaming because of their low price, simplicity of manufacturing, and versatility in surface decorating techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Improving the nucleation power or reducing the nucleation resistance is the fundamental strategy to enhance cell nucleation based on the classical nucleation theory impurities as nucleating agents to the system. 15,16 Among these methods mentioned above, the addition of nucleating agents is one of particular interest, which is ascribed to low equipment requirements as well as to the inexpensive cost. Silica nanoparticles are particularly appealing as impurity nucleation sites in plastic foaming because of their low price, simplicity of manufacturing, and versatility in surface decorating techniques.…”

Section: Introductionmentioning

confidence: 99%

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Lightweight and Tough Polypropylene/Silica Nanoparticle Composite Foam Nucleated from Nanoparticles with Intrinsic Cavities for Plastic Structural Components

Liu

Xing

Jiang

et al. 2023

ACS Appl. Nano Mater.

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Lightweight plastic foam materials can save resources and energy and reduce environmental pollution. However, these plastic components with large cell sizes present unsatisfactory mechanical properties. Here, we describe a successful strategy to fabricate lightweight and tough polypropylene/nucleating agent (PP/NA) composite foams with high cell density and small cell size by combining designed nanoparticles with intrinsic cavities as nucleating agents and chemical foam injection molding technologies. The influences of nucleating agents with different contents, morphologies, and process parameters on the cell morphology of pure PP and PP/NA foam samples were studied systematically. Owning to the effective increase of the number of nucleation sites by introducing SiO 2 nanoparticles with pits on the surface (NAC), the lightweight and tough PP/NAC composite foam that the addition amount of NAC of 1 wt % (PPC1) was prepared with a high cell density of 1.22 × 10 7 cells/cm 3 and a small cell size of 27.99 μm, which enhanced the tensile strength from 21.47 to 24.31 MPa and caused a 356.06% increase in tensile toughness. Furthermore, the effects of packing time on the foaming behavior of PPC1 were studied. When packing time is 5 s, the average cell size is 17.01 μm and the cell density reaches 3.01 × 10 7 cells/cm 3 , enhancing the tensile strength to 25.36 MPa and causing a 557.52% increase in the tensile toughness. Therefore, this work provided insights into fabrication of lightweight and tough PP/NA composite foams, which have great promise as structure materials for future use in many applications, such as automotive.

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Enhancing the foaming properties of polypropylene/basalt fiber composites by altering their rheological and crystallization behavior via polyethylene–octene blending modification

Zhu,

Shen,

Zeng

et al. 2023

Polymer Composites

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The quality of foam in polypropylene/basalt fiber (PP/BF) composite materials is currently unsatisfactory, which restricts their use in industrial applications. To address this limitation, the objective of this study is to improve the foaming properties of PP/BF composite foam by modifying their rheological and crystallization behavior using polyethylene–octene (POE) blending modification. The results demonstrate that the inclusion of POE has a beneficial impact on the rheological and crystallization characteristics of PP/BF composites. Consequently, this creates favorable conditions for the foaming process of PP/BF composite foam. It is conducive to obtaining high foaming quality PP/BF composite foam. The results demonstrate that a 5 wt% POE content yields the best foaming performance for the PP/BF composite foam, with the most uniform cell distribution, a cell size of 54 μm and a cell density is measured at 3.43 × 107 cells/cm3. The optimal temperature range for foaming is between 180 and 200°C. The introduction of POE in PP/BF composite foam may lead to a decrease in its tensile and flexural strength. However, this drawback is offset by a significant improvement in the notch impact strength of the foam. This study's findings will enhance our understanding of the production and application of PP/BF composite foam, making it a valuable material for applications that require exceptional toughness.Highlights Improved the crystallization and rheological properties of PP/BF composites. Significantly improve the foaming quality of PP/BF composites. Make PP/BF composite foam has excellent impact toughness.

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Designer petals shape ZnO nanoparticles as nucleating agents: Verification the mechanism of cavity nucleation in the polymer for foaming

Cited by 7 publications

References 43 publications

High strength and light weight polyamide 6/carbon fiber composite foams for electromagnetic interference shielding

High strength and light weight polyamide 6/carbon fiber composite foams for electromagnetic interference shielding

Lightweight and Tough Polypropylene/Silica Nanoparticle Composite Foam Nucleated from Nanoparticles with Intrinsic Cavities for Plastic Structural Components

Enhancing the foaming properties of polypropylene/basalt fiber composites by altering their rheological and crystallization behavior via polyethylene–octene blending modification

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