Topic
Blowing agent
About: Blowing agent is a research topic. Over the lifetime, 8147 publications have been published within this topic receiving 96771 citations.
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TL;DR: The possibilities for manufacturing metal foams or other porous metallic structures are reviewed in this article, where various manufacturing processes are classified according to the state of matter in which the metal is processed, such as solid, liquid, gaseous or ionised.
3,294 citations
TL;DR: In this article, supercritical carbon dioxide, an environmentally friendly, low-cost, non-flammable, chemically benign gas is used as the blowing agent to create microcellular foam.
702 citations
Patent•
28 Apr 1967TL;DR: In this article, thermoplastic microspheres are prepared which encapsulate a liquid blowing agent, which is useful for coatings, moldings, plastic smoke, etc. The expandable microsphere are prepared by a suspension-type polymerization of droplets of a mixture of monomer and blowing agent.
Abstract: Thermoplastic microspheres are prepared which encapsulate a liquid blowing agent. Heating of the microspheres causes expansion. The microspheres are useful for coatings, moldings, plastic smoke, etc. Urnlike hollow microspheres are also shown. The expandable microspheres are prepared by a suspension-type polymerization of droplets of a mixture of monomer and blowing agent.
602 citations
TL;DR: In this paper, a pressure quench was employed to generate a microcellular core structure encased by a nonporous skin, which can be used to model the effects of saturation pressure, temperature, and time on the cell density of the porous materials.
Abstract: Supercritical carbon dioxide is known to swell and plasticize poly(methyl methacrylate), PMMA, dramatically. We have employed a pressure quench in a CO2-swollen PMMA sample to generate a microcellular core structure encased by a nonporous skin. Further, we have demonstrated that classical nucleation theory can be used to model the effects of saturation pressure, temperature, and time on the cell density of the porous materials, provided that the effects of the CO2-diluent on the surface tension of PMMA are adequately taken into account. This is because our system is in a homogeneous liquid state at our operating conditions because of the plasticization. Both model predictions and data indicate that cell density rises sharply at a saturation pressure of approximately 14 MPa (at 40°C), leveling out above 27 MPa. By contrast, the effect of temperature on cell density in the range 40°C to 80°C is minimal.
475 citations
TL;DR: In this paper, a review of the developments made thus far in PLA foaming can be found, where the authors have investigated the fundamentals of PLA/gas mixtures, PLA foasting mechanisms, and the effects of material modification on PLA's foaming behavior through various manufacturing technologies.
385 citations