Microcellular foaming of silicone rubber with supercritical carbon dioxide

Hong, In-Kwon; Lee, Sang-Mook

doi:10.1007/s11814-013-0188-3

Cited by 49 publications

(24 citation statements)

References 27 publications

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“…To the best of our knowledge, few attempts have been made to investigate microcellular rubber foams with supercritical CO 2 foaming technology . Jacobs et al .…”

Section: Introductionmentioning

confidence: 99%

“…But both poly(ethylene‐ co ‐vinyl acetate) and poly(ethylene‐ co ‐octene) are regarded as thermoplastic elastomer. In the crosslinking systems such as silicone rubber, Hong and Lee prepared the microcellular liquid silicone rubber foam with supercritical CO 2 , and the cell diameter was 12 µm. In our previous research, the high temperature vulcanized (HTV) silicone rubber foam was prepared with supercritical CO 2 , but the cell diameter of silicone rubber foam was about 100 μm.…”

Section: Introductionmentioning

confidence: 99%

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Solid‐state microcellular high temperature vulcanized (HTV) silicone rubber foam with carbon dioxide

Yang

Song

et al. 2017

J of Applied Polymer Sci

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A series of microcellular high temperature vulcanized (HTV) silicone rubber foams were prepared using CO 2 as a physical blowing agent. Rheological properties, gas diffusive behavior, and foaming parameters of silicone rubber were investigated. The results show that saturation pressure has a significant effect on the diffusivity of CO 2 in HTV silicone rubber matrix. The gas concentration and diffusivity increase from 2.45 wt % to 3.24 wt %, and from 1.62 3 10 25 cm 2 /s to 7.83 3 10 25 cm 2 /s as the saturation pressure increases from 2 MPa to 5 MPa, respectively. The value of the gas diffusivity in HTV silicone rubber is almost 1000 times higher than that of the gas diffusivity in polyetherimide (PEI) matrix. Additionally, microcellular HTV silicone rubber foams with the smallest cell diameter of 9.8 lm and cell density exceeding 10 8 cells/cm 3 are achieved.

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“…To the best of our knowledge, few attempts have been made to investigate microcellular rubber foams with supercritical CO 2 foaming technology . Jacobs et al .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solid‐state microcellular high temperature vulcanized (HTV) silicone rubber foam with carbon dioxide

Yang

Song

et al. 2017

J of Applied Polymer Sci

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“…The primary challenge posed in foaming of rubbers stems from their elastic and soft (less rigid) structure. A limited number of studies that have appeared in the literature on foaming of silicone rubber with carbon dioxide show some of the challenges . These challenges include balancing the viscoelasticity, bubble growth and coalescence, and the need for pre‐and postfoaming curing.…”

Section: Introductionmentioning

confidence: 99%

Foaming of poly(ethylene‐co‐vinyl acetate) and poly(ethylene‐co‐vinyl acetate‐co‐carbon monoxide) and their blends with carbon dioxide

Sarver

Sumey

Williams

et al. 2017

J of Applied Polymer Sci

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Poly(ethylene‐co‐vinyl acetate) (EVA‐25) and poly(ethylene‐co‐vinyl acetate‐co‐carbon monoxide) (EVACO‐2410) and their blends with EVACO:EVA ratios of 80:20, 60:40, 40:60, and 20:80 were foamed using CO2. These foams are of interest for applications ranging from footwear to medical devices. Foaming experiments were carried out using 1 mm thick melt‐extruded films in CO2 at a range of pressures (100, 200, and 300 bar) and temperatures (30, 40, 50, and 60 °C). Foamability of the polymers was explored both under isothermal and gradient temperature conditions. Foams of EVACO‐2410 displayed high initial expansions followed by postfoaming relaxation and shrinkage while foams generated from EVA‐25 showed more dimensional stability. Blending EVACO‐2410 with EVA‐25 was explored as an approach to reduce postfoaming relaxation and shrinkage. The surfaces of the foamed samples displayed blistering that was linked to CO2 bubble entrapment and coalescence at the surface. Scanning electron micrographs of the foams generated from blends displayed distinct morphologies reflecting whether the sections were representing the machine‐ or cross‐machine direction of extruded films. In going from EVACO‐2410 to EVA‐25, the cell densities ranged from about 106 to 1010 cells/cm3. Foams with low bulk densities of about 0.11 g/cm3 could be generated. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45841.

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“…A few research groups have studied on microcellular foam of rubber. Hong and Lee obtained foams with cell size 12 μm, cell density >10 9 cm −3 , foam density about 0.2 g cm −3 , using methyl‐and‐hydrogen‐substituted silicone rubber and hydroxyl‐ended silicone rubber as matrix . The effect of cured degree on final cell size before foaming was mainly concerned, evaluated by the storage modulus.…”

Section: Introductionmentioning

confidence: 99%

“…Hong and Lee obtained foams with cell size 12 μm, cell density >10 9 cm −3 , foam density about 0.2 g cm −3 , using methyl-and-hydrogen-substituted silicone rubber and hydroxyl-ended silicone rubber as matrix. [20] The effect of cured degree on final cell size before foaming was mainly concerned, evaluated by the storage modulus. However, Hong and Lee's research object was room-temperature-cured silicone rubber, which has different cure mechanism with widely used high-temperature-vulcanized rubber.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Silicone Rubber Foam with Tailored Porous Structures by Supercritical CO₂

Yan

Wang

Zhao

2016

Macromol. Mater. Eng.

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In spite of great concern on the wide application of silicone rubber foams, few works have been reported about easy‐operating foaming method. In this study, the effects of silica content and foaming process on the porous structure of high‐temperature‐vulcanized silicon rubber foams are evaluated, which are prepared by supercritical CO2 at different conditions, with fumed silica used for reinforcement. Silicone rubber foams with cell size in 8–120 μm, cell density in 105–108 cm−3, and density between 0.45 and 0.9 g cm−3 are prepared under different saturation conditions. The results show that increasing silica content can decrease cell size. It is also found that cell density improves exponentially with increasing saturation pressure and decreasing saturation temperature. Besides, it demands less than 1 h for specimens to reach equilibrium on thickness around 3 mm. All the results indicate that the porous structures of silicone foams can be tailored by foaming process parameters facilely and are predictable with fitted equation.

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Microcellular foaming of silicone rubber with supercritical carbon dioxide

Cited by 49 publications

References 27 publications

Solid‐state microcellular high temperature vulcanized (HTV) silicone rubber foam with carbon dioxide

Solid‐state microcellular high temperature vulcanized (HTV) silicone rubber foam with carbon dioxide

Foaming of poly(ethylene‐co‐vinyl acetate) and poly(ethylene‐co‐vinyl acetate‐co‐carbon monoxide) and their blends with carbon dioxide

Fabrication of Silicone Rubber Foam with Tailored Porous Structures by Supercritical CO₂

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Microcellular foaming of silicone rubber with supercritical carbon dioxide

Cited by 49 publications

References 27 publications

Solid‐state microcellular high temperature vulcanized (HTV) silicone rubber foam with carbon dioxide

Solid‐state microcellular high temperature vulcanized (HTV) silicone rubber foam with carbon dioxide

Foaming of poly(ethylene‐co‐vinyl acetate) and poly(ethylene‐co‐vinyl acetate‐co‐carbon monoxide) and their blends with carbon dioxide

Fabrication of Silicone Rubber Foam with Tailored Porous Structures by Supercritical CO2

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Fabrication of Silicone Rubber Foam with Tailored Porous Structures by Supercritical CO₂