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:10.1177/026248930202100102

Cited by 8 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microcapsules containing water as a core material have been applied in the various fields such as pharmacy, adhesives, agricultural medicine, cosmetics, food and so on, because water is able to dissolve various materials of inorganic and organic substances [1,2]. There are many reports [3][4][5][6] with respect to microencapsulation of water, in which water as the core material has been mainly microencapsulated by using the multiple emulsion like the (W/O)/W emulsion.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Microcapsules Containing Water Droplets Stabilized with Solid Powder and Application to Blowing Agent

Nakamura¹,

Yokoyama²,

Taguchi³

2014

MSA

View full text Add to dashboard Cite

We have tried to prepare the microcapsules containing water droplets stabilized with solid powder by utilizing the (W/O)/W emulsion. The water droplets as core material were stabilized in the monomer droplets with titanium dioxide (TiO 2) as a particulate surfactant. Before adding the TiO 2 powder into the monomer phase, the powder was modified with triethoxyvinylsilane to adjust the degree of hydrophobicity and to promote adhesion on the interface between the inner water phase and the monomer phase in the (W/O) emulsion. It was investigated how the degree of hydrophobicity of the TiO 2 powder affected the stability of water droplets in the (W/O) emulsion and the (W/O) droplets in the (W/O)/W emulsion. Moreover, the microcapsule diameters were measured before and after the expansion operation where the water droplets microencapsulated were applied as a blowing agent. The expansion ratio was increased with increase in the stability of the water droplets and the amount of water microencapsulated.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation of Microcapsules Containing Water Droplets Stabilized with Solid Powder and Application to Blowing Agent

Nakamura¹,

Yokoyama²,

Taguchi³

2014

MSA

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

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

Cited by 8 publications

References 3 publications

Preparation of Microcapsules Containing Water Droplets Stabilized with Solid Powder and Application to Blowing Agent

Preparation of Microcapsules Containing Water Droplets Stabilized with Solid Powder and Application to Blowing Agent

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

Contact Info

Product

Resources

About