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Low Density Microcellular Foams Preparation And Articles
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Book Synopsis Low Density, Microcellular Foams, Preparation, and Articles by :
Download or read book Low Density, Microcellular Foams, Preparation, and Articles written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A microcellular low density foam of poly(4-methyl-1-pentene) which is particularly useful for forming targets for inertial confinement fusion has been developed. Articles made from the foam have been machined to tolerances of 0.0001 inch, although the densities of the fragile foam are low (about 10 to about 100 mg/cc) and the cell sizes are small (about 10 to about 30 .mu.m). Methods for forming the foam and articles are given; and the yield strength of the foam of the invention is higher than was obtained in other structures of this same material.
Book Synopsis Low Density Microcellular Carbon Foams and Method of Preparation by :
Download or read book Low Density Microcellular Carbon Foams and Method of Preparation written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A low density, open-celled microcellular carbon foam is disclosed which is prepared by dissolving a carbonizable polymer or copolymer in a solvent, pouring the solution into a mold, cooling the solution, removing the solvent, and then carbonizing the polymer or copolymer in a high temperature oven to produce the foam. If desired, an additive can be introduced in order to produce a doped carbon foam, and the foams can be made isotropic by selection of a suitable solvent. The low density, microcellular foams produced by this process are particularly useful in the fabrication of inertial confinement fusion targets, but can also be used as catalysts, absorbents, and electrodes.
Book Synopsis Advances in Preparing and Characterizing Low Density Pan-carbon Microcellular Foam by :
Download or read book Advances in Preparing and Characterizing Low Density Pan-carbon Microcellular Foam written by and published by . This book was released on 1993 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents an improved preparation of low density microcellular carbon as well as characterization of spatial homogeneity. The report also documents the process for preparing the nficrocellular carbon from poly(acrylonitrile) raw material. A microcellular polymer precursor (0.025 g/cc) is first prepared via a solution-based process and then pyrolyzed to produce the microcellular carbon in a monolithic form (0.05 g/cc). The process improvement developed in this study permits the pore structure of the n-ficrocellular polymer precursor and the microcellular carbon to be reproduced consistently in different laboratories. Pore structure is affected by the completeness of dissolution of the polymer raw material, which variable can be adjusted via dissolution temperature or particle size of the raw material. The second topic in this report involves determining the spatial fluctuation in mass density caused by periodic, millimeter-scale bands, known as 'tree rings' visible on machined surfaces of the carbon monoliths. To measure the fluctuations, we developed a high precision, spatially resolved X-ray transmission technique. The periodic bands caused less than "2% variation of mass density in a microcellular carbon having average density 0.041 g/cc.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1984 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nucleating Agents by : Stuart Fairgrieve
Download or read book Nucleating Agents written by Stuart Fairgrieve and published by iSmithers Rapra Publishing. This book was released on 2007-11 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: A very important factor in obtaining optimised physical properties from a semi-crystalline polymer is the size of the crystalline structures present in the material, and this crucially depends on the initiation process of crystallisation of the polymer from the melt - nucleation. This review provides information on the development of materials and methods for influencing the nucleation of polymer crystallisation in commercial processing by means of addition of low levels of adjuvants specifically selected for this purpose.
Book Synopsis Molded Ultra-low Density Microcellular Foams by : P. B. Rand
Download or read book Molded Ultra-low Density Microcellular Foams written by P. B. Rand and published by . This book was released on 1986 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microcellular Foams Prepared from Demixed Polymer Solutions by :
Download or read book Microcellular Foams Prepared from Demixed Polymer Solutions written by and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-density, microcellular polymer foams have numerous applications as structural supports in high-energy physics experiments, in catalysis, ion exchange, and filtration, and for a variety of biomedical uses. A versatile method to prepare such foams is by thermally-induced phase separation (TIPS) of polymer solutions. Demixed solutions can be transformed into a foam by freezing the demixed solution and removing the solvent by freeze-drying. The morphology of these foams is determined by the the thermodynamics and kinetics of phase separation. A model of both the early and late stage structure development for demixed polymer solutions will be presented. For semi-crystalline polymers, gels can be prepared by crystallizing the polymer from solution, either a homogeneous solution or a demixed solution. Foams can be prepared from these gels by the supercritical extraction of the solvent. By understanding and utilizing the phase separation behavior of polymer solutions, engineered microcellular foams can be prepared. To design the foams for any application one must be able to characterize their morphology. Results will be presented on the morphological characterization of these foams and the relationship of the morphology to their processing history. 14 refs., 12 figs.
Book Synopsis Handbook of Manufacturing Engineering and Technology by : Andrew Y. C. Nee
Download or read book Handbook of Manufacturing Engineering and Technology written by Andrew Y. C. Nee and published by Springer. This book was released on 2014-10-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Reference Work Handbook of Manufacturing Engineering and Technology provides overviews and in-depth and authoritative analyses on the basic and cutting-edge manufacturing technologies and sciences across a broad spectrum of areas. These topics are commonly encountered in industries as well as in academia. Manufacturing engineering curricula across universities are now essential topics covered in major universities worldwide.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1984 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications of Los Alamos Research by : Los Alamos National Laboratory
Download or read book Publications of Los Alamos Research written by Los Alamos National Laboratory and published by . This book was released on 1985 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rubber Toughened Engineering Plastics by : A.A. Collyer
Download or read book Rubber Toughened Engineering Plastics written by A.A. Collyer and published by Springer Science & Business Media. This book was released on 1994-05-31 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rubber Toughened Engineering Plastics covers the main physical principles involved in optimum toughening in high temperature engineering plastics and speciality plastics and describes the synthetic strategies used to obtain satisfactorily toughened grades in these materials by control of microstructure. This book will act as a focus for current thought on the principles of rubber toughening and the methods employed for the rubber toughening of major engineering and speciality plastics.
Book Synopsis Official Gazette of the United States Patent and Trademark Office by : United States. Patent and Trademark Office
Download or read book Official Gazette of the United States Patent and Trademark Office written by United States. Patent and Trademark Office and published by . This book was released on 2000 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Index of Patents Issued from the United States Patent and Trademark Office by :
Download or read book Index of Patents Issued from the United States Patent and Trademark Office written by and published by . This book was released on 1989 with total page 1812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Extrusion Processing of Low-density Microcellular Foams by :
Download or read book Extrusion Processing of Low-density Microcellular Foams written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Amir Hossein Behravesh Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612351103 Total Pages : pages Book Rating :4.3/5 (511 download)
Book Synopsis Extrusion Processing of Low-density Microcellular Foams [microform] by : Amir Hossein Behravesh
Download or read book Extrusion Processing of Low-density Microcellular Foams [microform] written by Amir Hossein Behravesh and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultra-low Density Microcellular Polymer Foam and Method by :
Download or read book Ultra-low Density Microcellular Polymer Foam and Method written by and published by . This book was released on 1995 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: An ultra-low density, microcellular open-celled polymer foam and a method for making such foam are disclosed. A polymer is dissolved in a heated solution consisting essentially of at least one solvent for the dissolution of the polymer in the heated solution and the phase inversion of the dissolved polymer to a liquid gel upon sufficient cooling of the heated solution. The heated solution is contained in a containment means provided with a nucleating promoting means having a relatively rough surface formed of fixed nucleating sites. The heated solution is cooled for a period of time sufficient to form a liquid gel of the polymer by phase inversion. From the gel, a porous foam having a density of less than about 12.0 mg/cm3 and open porosity provided by well interconnected strut morphology is formed. These foams can be used for ICF targets.
Download or read book Polymeric Foams written by Shau-Tarng Lee and published by CRC Press. This book was released on 2006-08-21 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are among the major hallmarks of 20th-century science, and the explosive outgrowth and tremendous importance of polymeric foams is a testament to their amazing versatility and unique properties. With applications from automotive to acoustic and medical, polymeric foams pervade all areas of our lives. If this growth is to continue into the
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