Polycarbonate Microfoams with a Smooth Surface and Higher Notched Impact Strength

Błędzki, Andrzej K.; Kirschling, Hendrik; Steinbichler, Georg; Egger, P.

doi:10.1177/0021955x04048423

Cited by 44 publications

(36 citation statements)

References 2 publications

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“…Figure a shows the Charpy V‐notch toughness data of our PC composites with GNP, CB, or GNP–CB. The measured toughness of our pure PC (∼15 kJ m −2 ) is consistent with reported results elsewhere (14–18 kJ m −2 ); the toughness of the nanocomposites with CB or GNP alone, i.e., 12–13 kJ m −2 , is slightly lower than but still comparable to that of the pure PC, a phenomenon not unusual if the inorganic particles acted as stress concentrators . Surprisingly, the toughness of the ternary composites loaded with two carbon‐based fillers (∼23 kJ m −2 ) is almost twice that of those binary ones or more than 50% higher than pristine PC.…”

Section: Calculated Interaction Energies Between Different Componentssupporting

confidence: 90%

Nanocavities Double the Toughness of Graphene–Polycarbonate Composite

et al. 2014

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Section: Calculated Interaction Energies Between Different Componentssupporting

confidence: 90%

Nanocavities Double the Toughness of Graphene–Polycarbonate Composite

et al. 2014

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“…There are a number of visible splashes on the surface. The vapor bubbles burst under high shear on the surface, which also take place in the MuCell processing [13].…”

Section: Resultsmentioning

confidence: 99%

“…Djoumaliisky et al [11, 12] investigated microstructure variation due to the GCP in the polypropylene foam molding. Later, Bledzki et al [13] applied the GCP technology to the MuCell process to improve the surface quality of the molded part by suppressing the activity of the blow agent. Since then, there have been several studies on the MuCell combined with the GCP [14–17].…”

Section: Introductionmentioning

confidence: 99%

Injection molding without prior drying process by the gas counter pressure

Yoo

Woo

Kim

2012

Polymer Engineering & Sci

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A processing technology that facilitates quality injection molding without prior drying of polymer pellets has been proposed. The main idea is not to let the water evaporate to bubbles inside the mold. The polymer will be maintained hydrated as it was in the hopper of the injection molding machine throughout the entire molding processes by controlling the cavity pressure above the saturation pressure of water until solidified. In this work, the gas counter pressure (GCP) system has been designed and built to maintain the cavity pressure above the saturation pressure. The performance of the proposed method has been examined by checking the visual quality and the mechanical properties of the molded parts. The method has been tested with pellets of polymethyl methacrylate (PMMA), polycarbonate, polyethylene terephthalate, polybutylene terephthalate, and polyamide 66. The results show that the GCP prevents surface impairment incurred by the vapors without or with minor effects on the mechanical properties. Finally, the effects of energy saving has been examined by conducting the actual process for 1 day.

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“…To improve the cell morphology's uniformity and the part's surface quality, FIM experiments can be performed using GCP . Figure schematically illustrates the GCP‐based FIM process, and compares it with low‐pressure FIM.…”

Section: Fim With Gcpmentioning

confidence: 99%

Identification of cell‐nucleation mechanism in foam injection molding with gas‐counter pressure via mold visualization

et al. 2016

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The mechanisms of cell nucleation and growth are investigated in foam injection molding (FIM) using gas-counter pressure (GCP). An in-situ mold visualization technique is employed. The application of GCP suppresses cell nucleation, and prevents the blowing agent from escaping during mold-filling. The inherent structural heterogeneity in the regular FIM can be improved because of the uniform cavity pressure when employing GCP. The cavity pressure profiles show much faster pressure-drop rates using GCP, because the single-phase polymer/gas mixture has a lower compressibility than the two-phase polymer/bubble mixture. Therefore, both the cell nucleation and growth rates are significantly increased through a higher pressure-drop rate on the removal of the GCP. The effect of GCP magnitude on the cell morphology is explored. When the GCP is lower than the solubility pressure, bimodal foaming occurs. As the GCP increases above the solubility pressure, the cell density increases because of the higher pressure-drop rate. Figure 14. Formation of a bimodal structure as a result of an insufficient GCP of 2.30 MPa (injection speed: 35 cm 3 s 21 ; CO 2 : 1%; T melt 5 230 C).

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Polycarbonate Microfoams with a Smooth Surface and Higher Notched Impact Strength

Cited by 44 publications

References 2 publications

Nanocavities Double the Toughness of Graphene–Polycarbonate Composite

Nanocavities Double the Toughness of Graphene–Polycarbonate Composite

Injection molding without prior drying process by the gas counter pressure

Identification of cell‐nucleation mechanism in foam injection molding with gas‐counter pressure via mold visualization

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