2015
DOI: 10.1016/j.polymer.2015.06.031
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Solid-state poly(methyl methacrylate) (PMMA) nanofoams. Part II: Low-temperature solid-state process space using CO2 and the resulting morphologies

Abstract: In this paper, solid-state poly(methyl methacrylate) (PMMA) nanofoams are fabricated via a lowtemperature CO 2 saturation process. Nanofoams with smallest cell size in 30-40 nm range and cell nucleation densities exceeding 10 14 cells/cm 3 are achieved. We investigated the effect of saturation temperature on the solid-state foaming of PMMA and resulting morphologies of the foams in the range of-30 °C to 40 °C. A range of equilibrium mass% of CO 2 are achieved via the different saturation temperatures, from 11.… Show more

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Cited by 63 publications
(54 citation statements)
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“…For materials like PEI, the critical concentration is similar to the PPSU one, between 9.4% and 11% [12] while there are polymers that need higher gas concentrations in order to lead nanocells. For instance, for PMMA the critical concentration is between 30.1% and 32.6% [4], and for PC this value is between 15.9% and 18.9% of gas uptake [6].…”
Section: Influence Of the Saturation Pressurementioning
confidence: 99%
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“…For materials like PEI, the critical concentration is similar to the PPSU one, between 9.4% and 11% [12] while there are polymers that need higher gas concentrations in order to lead nanocells. For instance, for PMMA the critical concentration is between 30.1% and 32.6% [4], and for PC this value is between 15.9% and 18.9% of gas uptake [6].…”
Section: Influence Of the Saturation Pressurementioning
confidence: 99%
“…For instance, it is well known than poly(methyl methacrylate) (PMMA) and copolymers based on PMMA can be used to produce nanocellular foams [2] using the socalled solid state foaming method [3]. Different foaming conditions can be used to obtain nanocells between 20 and 200 nm and relative densities around 0.4-0.5 [4,5]. For polycarbonate (PC) systems, Guo et al [6] obtained cell sizes of the order of 20 nm and relative densities around 0.6 working with low saturation temperatures.…”
Section: Introductionmentioning
confidence: 99%
“…The pressure drop rates in these experiments were 15 MPa/s, 56 MPa/s and 100 MPa/s, respectively. For this study, foaming has been [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] carried out at 80°C during 2 min. Secondly the effect of the foaming temperature has been analysed by fixing the saturation pressure to 10 MPa, varying the foaming temperature from 80°C to 110°C, keeping, once again, 2 min as foaming time.…”
Section: Gas Dissolution Foaming Experimentsmentioning
confidence: 99%
“…However, the production of nanocellular materials using homogeneous systems usually requires extreme saturation conditions so as to obtain the high cell nucleation densities required. For instance, for polycarbonate (PC) [10], polysulfone (PSU) [11] and poly(methyl methacrylate) (PMMA) [12]. Guo and coworkers [12] obtained cell sizes as low as 20 nm working with extremely low saturation temperatures (−30°C).…”
Section: Introductionmentioning
confidence: 99%
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