Foaming Mechanism of Polypropylene in Gas-Assisted Microcellular Injection Molding

Hou, Junji; Zhao, Guoqun; Zhang, Lei; Dong, Guohai; Wang, Guilong

doi:10.1021/acs.iecr.7b05389

Cited by 12 publications

(4 citation statements)

References 49 publications

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“…In recent years, the microcellular foaming composites are increasingly recognized as an important component for improving the structure and properties of polymeric materials due to their remarkable effects such as lightweight [ 1 , 2 , 3 ] and low dielectric constant [ 4 , 5 ]. The microcellular foaming process can generate large numerous of micron-sized cells inside the polymer matrix, forming a unique dense surface and core foamed structure [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Glass Fiber-Reinforced Polyamide/Nylon Microcellular Foamed Composites

Wang

Xie

et al. 2020

Polymers

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The automobile and aerospace industries require lightweight and high-strength structural parts. Nylon-based microcellular foamed composites have the characteristics of high strength and the advantages of being lightweight as well as having a low production cost and high product dimensional accuracy. In this work, the glass fiber-reinforced nylon foams were prepared through microcellular injection molding with supercritical fluid as the blowing agent. The tensile strength and weight loss ratio of microcellular foaming composites with various injection rates, temperatures, and volumes were investigated through orthogonal experiments. Moreover, the correlations between dielectric constant and injection volume were also studied. The results showed that the “slow–fast” injection rate, increased temperature, and injection volume were beneficial to improving the tensile strength and strength/weight ratios. Meanwhile, the dielectric constant can be decreased by building the microcellular structure in nylon, which is associated with the weight loss ratio extent closely.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Glass Fiber-Reinforced Polyamide/Nylon Microcellular Foamed Composites

Wang

Xie

et al. 2020

Polymers

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“…Cell size is not uniform and shape is irregular for the PP/PCL composites. The melt strength of PP was not strong so it caused irregular shape [10]. The cell size are 160, 100, 120, and 130 μm for neat PP, 0.5, 1.0, and 3.0 wt% PCL loading respectively.…”

Section: Morphologymentioning

confidence: 99%

Synthesis and Characterization of Microcellular Injection Molded Polyolefin/Polycaprolactone Composites

Hwang

Chen

Yang

2021

MSF

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This study investigated the effect of polycaprolactone (PCL) loading (0.5, 1, and 3 wt%) on the morphology, tensile strength, and thermal properties of microcellular injection molded PP/PCL and PPgMA/PCL composites. We used the filler, PCL, that is micro-material in size. Results showed that 0.5 wt% loading of PCL on foamed PP has the largest tensile strength. However, tensile strength was almost similar to that of PPgMA composites. Tensile strength depends on the filler dispersion in the matrix and cell size present on the foamed composites. Good dispersion resulted in good tensile strength. The elongation decreased on PP but increased on PPgMA composites. The highest degradation temperature for PP/PCL and PPgMA/PCL was noted for 3.0 wt% PCL loading and neat PPgMA respectively. Cell size decreased and cell density increased with the addition of PCL into the PP and PPgMA matrix.

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“…Polymeric foams consist of a solid polymer matrix with dispersed air bubbles, and they use less plastic than solid plastics with equivalent volumes. Additionally, the foams exhibit superior properties, such as thermal and sound insulation, impact resistance, and light weights. − These characteristics make them ideal for applications in housing, mobility equipment, appliances, and more.…”

Section: Introductionmentioning

confidence: 99%

In-Line Near-Infrared Spectral Monitoring of Dissolved Nitrogen in Molten Polymers during Foam Injection Molding

Yoshikawa,

Hikima,

Ohshima

2024

Ind. Eng. Chem. Res.

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Polymeric foams offer significant benefits in terms of resource conservation. Foam injection molding (FIM) is a common mass-production technique used for preparing polymeric foams. Recently, we developed an inline near-infrared (NIR) spectroscopic sensor to monitor the concentrations of blowing agents dissolved in the polymers during the process. The proposed technique was suitable for measuring concentrations of carbon dioxide (CO 2 ); however, for nitrogen (N 2 ), it is still challenging because N 2 is infrared-inactive. A scheme developed in this research overcame this problem by estimating the N 2 concentration from changes in the polymer density resulting from N 2 dissolution. The NIR absorption peak of the polymer density was changed by the dissolution of N 2 during polymer processing. A multivariate model and an equation of state were combined to estimate the N 2 concentration from the NIR spectrum. The method provides precise concentrations for N 2 dissolved into the polymer as the physical blowing agent.

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Foaming Mechanism of Polypropylene in Gas-Assisted Microcellular Injection Molding

Cited by 12 publications

References 49 publications

Microstructure and Properties of Glass Fiber-Reinforced Polyamide/Nylon Microcellular Foamed Composites

Microstructure and Properties of Glass Fiber-Reinforced Polyamide/Nylon Microcellular Foamed Composites

Synthesis and Characterization of Microcellular Injection Molded Polyolefin/Polycaprolactone Composites

In-Line Near-Infrared Spectral Monitoring of Dissolved Nitrogen in Molten Polymers during Foam Injection Molding

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