Water-blown Expandable Polystyrene. Improvement of the Compatibility of the Water Carrier with the Polystyrene Matrix by in Situ Grafting

Pallay, Jan; Berghmans, Hugo

doi:10.1177/026248930202100101

Cited by 11 publications

(6 citation statements)

References 16 publications

(26 reference statements)

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“…The water vaporized at room temperature may not contribute to expanding the microcapsules [17] [18].…”

Section: Water Contentmentioning

confidence: 99%

Preparation of Microcapsules Containing Water and Effect of Water Content on Expansion Behavior

Taguchi¹,

Saito²,

Oda³

2017

JEAS

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The research work was conducted in order to establish the optimum conditions for preparing the expanded polystyrene beads without harmful substances and was aimed at the preparation of the microcapsules containing water and investigation of the effect of the water content on the expansion behavior of microcapsules. Microcapsules were prepared with the suspension polymerization method and the suspension polymerization in parallel with interfacial polycondensation method using the multiple emulsion (W/O)/W and adding a few additives. With increasing the crosslinking agent concentration in the suspension polymerization method, the water content increased from R = 5.8 wt% (C T = 0) to R = 8.2 wt% (C T = 4 wt%) and then, decreased to R = 7.5 wt% (C T = 9.0 wt%), while the expansion ratio increased from E = 1.01 (C T = 0) to E = 2.20 (C T = 4 wt%) and then, decreased to E = 1.01 (C T = 7.0 wt%). With increasing the added amount of wax in the suspension polymerization method, the water content gradually increased from R = 2.5 wt% to R = 8.0 wt%, while the expansion ratio increased from E = 1.01 to E = 1.5 and then, decreased. The water content and the expansion ratio could be increased by conducting suspension polymerization in parallel with interfacial polycondensation reaction from R = 5.0 wt % to R = 8.0 wt % and from E = 1.01 to E = 1.3, respectively. The maximum expansion ratio of E = 2.58 in this work was obtained under the conditions of crosslinking agent concentration of C T = 4.0 wt %, the added amount of wax of 3.0 g, addition of Agarose and the expansion temperature of T = 150˚C.

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“…The water vaporized at room temperature may not contribute to expanding the microcapsules [17] [18].…”

Section: Water Contentmentioning

confidence: 99%

Preparation of Microcapsules Containing Water and Effect of Water Content on Expansion Behavior

Taguchi¹,

Saito²,

Oda³

2017

JEAS

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“…In another method [12], water and surfactants were injected into the extruder to make WEPS pellets. Instead of using emulsifiers or surfactants, starch was also used as a water‐swellable phase [13–16]. Prepolymerization of the styrene/starch mixture was carried out to a lower conversion.…”

Section: Introductionmentioning

confidence: 99%

Introducing water as a coblowing agent in the carbon dioxide extrusion foaming process for polystyrene thermal insulation foams

Yeh

Yang

Chiou

et al. 2010

Polymer Engineering & Sci

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In this study, water was used as a coblowing agent in the carbon dioxide (CO2) extrusion foaming process in a twin screw extruder. It enlarged cell size and thus lowered foam density for better thermal insulation. Different strategies have been studied including direct injection of water into the extruder with surfactants, extrusion foaming of water expandable polystyrene (WEPS) beads, and feeding water containing activated carbon (WCAC)/polystyrene (PS) pellets. It was found that WCAC/PS pellets provided the most stable and clean extrusion process, more uniform cell morphology, and better thermal insulation than other methods. POLYM. ENG. SCI., 50:1577–1584, 2010. © 2010 Society of Plastics Engineers

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“…Water is frequently selected as one of the two blowing agents. In fact, there has been much research on the water foaming method because water is environmentally benign, as well as inexpensive [8,[13][14][15][16][17][18][19][20][21][22][23]. However, since the solubility of water in polymers is very low, it is generally believed to be very difficult to obtain a fine and uniform cell morphology using water as a blowing agent.…”

Section: Introductionmentioning

confidence: 99%

Bi-cellular Foam Structure of Polystyrene from Extrusion Foaming Process

Lee

Kim

et al. 2009

Journal of Cellular Plastics

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This article investigates the foaming process of bi-cellular polystyrene foams blown with n-butane and water in extrusion. The bi-cellular foam structure has two types of cells: large cells ranging from 0.1 to 1.2 mm and small cells ranging in size from about 5% to about 50% of the average large cell size, which constitute more than 90% of the total cell volume. A bi-cellular structure has outstanding heat insulation property. In order to generate a bi-cellular structure, a water-blowing technology was used. This technique is environmentally benign and economical since butane and water are used as blowing agents. Despite these advantages, the foaming process and mechanism of bi-cellular foams have not been identified in detail. Therefore, in this article, an attempt has been made to enhance our knowledge and understanding of the foaming behavior of bi-cellular polystyrene foam. The effects of n-butane, water, and silica (a nucleating agent) on the foam cell morphology are presented.

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Water-blown Expandable Polystyrene. Improvement of the Compatibility of the Water Carrier with the Polystyrene Matrix by in Situ Grafting

Cited by 11 publications

References 16 publications

Preparation of Microcapsules Containing Water and Effect of Water Content on Expansion Behavior

Preparation of Microcapsules Containing Water and Effect of Water Content on Expansion Behavior

Introducing water as a coblowing agent in the carbon dioxide extrusion foaming process for polystyrene thermal insulation foams

Bi-cellular Foam Structure of Polystyrene from Extrusion Foaming Process

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