2019
DOI: 10.3390/polym11040648
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Bubble Growth in Poly(methyl methacrylate) and Carbon Dioxide Mixture

Abstract: In this paper, we study bubble nucleation and growth in a poly(methyl methacrylate) and CO 2 mixture by molecular dynamics simulations. It is known in the foaming industry that the bubble size has a more uniform distribution with a higher start-up pressure. The real physical reason remains unclear. In this work, we found that the free volume-rich polymer segments could adsorb many small-size bubbles in the region close to the polymer chain. The existence of these small bubbles limits the number of free… Show more

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Cited by 5 publications
(4 citation statements)
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References 22 publications
(33 reference statements)
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“…Here it is notable that tiny bubbles, during the polymerization process, grow larger either through amalgamation or expansion in an exothermic reaction. 27 During mixing, bubbles that are imperceptible to the human eye suddenly become visible after curing. While the chemical analysis proved that the reinforcing GA powder did not affect the structure of the original PMMA.…”
Section: Discussionmentioning
confidence: 99%
“…Here it is notable that tiny bubbles, during the polymerization process, grow larger either through amalgamation or expansion in an exothermic reaction. 27 During mixing, bubbles that are imperceptible to the human eye suddenly become visible after curing. While the chemical analysis proved that the reinforcing GA powder did not affect the structure of the original PMMA.…”
Section: Discussionmentioning
confidence: 99%
“…Most of these factors have evolved for the purpose of exuberant situations, which makes things more complex (temperature and pressure). 127,129 Established on the presence of a nucleation site, the nucleation process is also classified into solid nucleation and heterogeneous nucleation. The main dissimilarity between solid and heterogeneous nucleation is the required power of stimulation for nucleation, which is Gibbs free energy (G) = G H TS (1) where H and S can be related to the quantity and distribution of energy in a collection of molecules and T is the temperature.…”
Section: Foaming Tube and Plunging Jetsmentioning
confidence: 99%
“…Each phase is affected by several physical attributes, such as viscosity, gas solubility, surface tension, and glass transition temperature. Most of these factors have evolved for the purpose of exuberant situations, which makes things more complex (temperature and pressure). , …”
Section: Foam Generation Processes/techniquesmentioning
confidence: 99%
“…[ 29–33 ] The effect of temperature, viscosity, and other materials function on the bubble growth in thermoplastics foaming process was simulated by other researchers. [ 34–37 ]…”
Section: Introductionmentioning
confidence: 99%