High impact performance induced by a synergistic effect of heteroepitaxy and oriented layer-unoriented layer alternated structure in iPP/HDPE injection molded part

Gu, Xuanbo; Wang, Yingxiong; Jiang, Yixin; Liu, Mingjin; Fu, Qiang; Zhang, Jie

doi:10.1016/j.polymer.2019.05.018

Cited by 20 publications

(16 citation statements)

References 28 publications

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“…The average equivalent particle size (D p ), the average equivalent aperture size (D b ), and the plane pore ratio (e), were quantitatively analyzed. Gu [22], Vito [23], and Yang [24,25] introduced the calculation process of micro-parameters.…”

Section: Image Analysis Resultsmentioning

confidence: 99%

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Research on Unconstrained Compressive Strength and Microstructure of Calcareous Sand with Curing Agent

Yang

Liu

2019

JMSE

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In the South China Sea, calcareous sand, as a natural foundation, has the features of low mechanical properties, including its compressive strength. With the development of South China Sea islands, the problems of calcareous sand foundation are encountered in the process. However, the experience of traditional pile foundation engineering could not be applied to calcareous sand. In this study, different proportions of curing agents were added to calcareous sand to improve the compressive strength. The quantitative analysis of the relationship between the unconfined compressive strength and microstructure of solidified calcareous sand is discussed. The unconfined compressive strength was gauged from unconfined compressive strength tests. Microscopic images, acquired using a scanning electron microscope (SEM), were processed using the Image-Pro Plus (IPP) image processing software. The microscopic parameters, obtained using IPP, include the average equivalent particle size (Dp), the average equivalent aperture size (Db), and the plane pore ratio (e). This research demonstrates that the curing agent could improve the compressive strength, which has a relation with the three microstructure parameters. The curing agent, through hydration reaction, generates hydration products, i.e., calcium silicate hydrate, calcium hydroxide, and calcite crystals. They adhere to the surface of the particles or fill the space between the particles, which helps increase the compressive strength. In addition, there is a good linear relationship between the macroscopic mechanics and the microscopic parameters. Using the mathematical relation between the macroscopic and microscopic parameters, the correlation can be built for macro-microscopic research.

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Section: Image Analysis Resultsmentioning

confidence: 99%

“…The microscopic images of the solidified calcareous sand were processed and analyzed using IPP. Gu et al [22], Vito et al [23], and Yang et al [24,25] introduced these specific practices. The processing steps are as follows.…”

mentioning

confidence: 99%

Research on Unconstrained Compressive Strength and Microstructure of Calcareous Sand with Curing Agent

Yang

Liu

2019

JMSE

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“…The yield of B2(M) is 28.8 MPa, and its impact strength is 5.0 kJ/m 2 , which are 10% and 30% higher than those of B2(C), respectively. The improved properties may be primarily attributed to the high mechanical performance of the oriented crystals [26,39,40]. A high shear stress orients the CNTs or CNT aggregates.…”

Section: Resultsmentioning

confidence: 99%

Effects of Three Different Injection-Molding Methods on the Mechanical Properties and Electrical Conductivity of Carbon Nanotube/Polyethylene/Polyamide 6 Nanocomposite

Zhao

Zhu

2019

Polymers

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Morphological evolution under shear, during different injection processes, is an important issue in the phase morphology control, electrical conductivity, and physical properties of immiscible polymer blends. In the current work, conductive nanocomposites were produced through three different injection-molding methods, namely, conventional injection molding, multi-flow vibration injection molding (MFVIM), and pressure vibration injection molding (PVIM). Carbon nanotubes in the polyamide (PA) phase and the morphology of the PA phase were controlled by various injection methods. For MFVIM, multi-flows provided consistently stable shear forces, and mechanical properties were considerably improved after the application of high shear stress. Shear forces improved electrical property along the flow direction by forming an oriented conductive path. However, shear does not always promote the formation of conductive paths. Oscillatory shear stress from a vibration system of PVIM can tear a conductive path, thereby reducing electrical conductivity by six orders of magnitude. Although unstable high shear forces can greatly improve mechanical properties compared with the conventional injection molding (CIM) sample, oscillatory shear stress increases the dispersion of the PA phase. These interesting results provide insights into the production of nanocomposites with high mechanical properties and suitable electrical conductivity by efficient injection molding.

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“…The processing steps were as follows. More details of specific practices about IPP are described in References [3,15,16]. Image segmentation is defined as the binarization of an image, and the images are converted into the pictures which best reflects the true appearance of the stabilized soil in the IPP software.Image morphology processing was conducted in order to avoid destroying the original image structure.The measuring units were calibrated.…”

Section: Methodsmentioning

confidence: 99%

“…Due to the high-water content of the dredger fill, its engineering properties and performance are very poor. Adding a curing agent to the dredger fill can quickly increase the quality of the performance; however, curing agents are not widely used due to the fact of their high cost [1,2,3,4,5,6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil

Yang

Liu

2019

Materials

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Adding a curing agent can enhance the mechanical properties of soil including its compressive strength. However, few studies have quantitatively analyzed the compressive strength and microstructure of soils to explore the impact of changes in the microstructure on compressive strength. In addition, the cost of curing agents is too high to be widely used. In this study, curing agents with different proportions of fly ash were added to dredger fill to reduce the amount of curing agents needed. The quantitative analysis of the relationships between the modulus of compression Es and microstructures of stabilized soil samples is presented. The modulus of compression Es was gauged from compression tests. Microscopic images acquired using a scanning electron microscope were processed using the Image-Pro Plus (IPP) image processing software. The microscopic parameters, obtained using IPP, included the average equivalent particle size Dp, the average equivalent aperture size Db, and the plane pore ratio e. This research demonstrated that the fly ash added to the curing agent achieved the same effect as the curing agent, and the amount of curing agent required was reduced. Therefore, the modulus of compression for stabilized soil can be improved. This is due to the hydration products (i.e., calcium silicate hydrate, calcium hydroxide, and ettringite), produced by the hydration reaction, and which adhere to the surface of the particles and fill the spaces among them. Thus, the change in the pore structure and the compactness of the particles helps to increase the modulus of compression. In addition, there was a good linear relationship between the modulus of compression and the microscopic parameters. Using the mathematical relationships between the macroscopic and microscopic parameters, correlations can be built for macro–microscopic research.

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High impact performance induced by a synergistic effect of heteroepitaxy and oriented layer-unoriented layer alternated structure in iPP/HDPE injection molded part

Cited by 20 publications

References 28 publications

Research on Unconstrained Compressive Strength and Microstructure of Calcareous Sand with Curing Agent

Research on Unconstrained Compressive Strength and Microstructure of Calcareous Sand with Curing Agent

Effects of Three Different Injection-Molding Methods on the Mechanical Properties and Electrical Conductivity of Carbon Nanotube/Polyethylene/Polyamide 6 Nanocomposite

The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil

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