solid state shear pulverization

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Solid State Shear Pulverization
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Publisher : CRC Press
Release Date :
ISBN 10 : 9781420015010
Pages : 203 pages
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From the Preface This book is the first extended look at a new and multifaceted polymer processing technology that has already been discussed in numerous articles. Called Solid-State Shear Pulverization (S3P), this innovative process produces polymeric powders with unique physical properties not found in the output of conventional size-reduction methods.... This technology, which utilizes a pulverizer based on a modified co-rotating twin-screw extruder..., has profound implications for both the creation of new polymer blends and recycling of plastic and rubber waste. Unlike [earlier processes] where polymers are melted prior to pulverization, ...pulverizing mixtures of polymers with the S3P process...does not involve melting. By contrast, S3P maintains polymers in the solid state and avoids the additional heat history that occurs during [other processes], which can be detrimental to the physical properties of pulverized materials. The research and development of the S3P technology...has grown significantly since 1990 from the development of a new plastics recycling process to a much broader polymer processing method that allows intimate mixing of polymers with very different viscosities, sold-state dispersion of additives, including pigments, and continuous production of powder with unique shapes and larger surface areas. Polymeric powders are of growing importance to plastics processors due to the increase use of plastics in various applications, such as rotational molding, powder coatings, and compounding, which require powder as the feedstock. ...[I]t has become clear that this process allows for in-situ compatibilization of dissimilar polymers by applying mechanical energy to cause chemical reactions. This aspect of S3P technology that we describe in this book should [be useful in] developing new polymer blends with the use of pre-made compatibilizing agents. In addition, it has been discovered that S3P efficiently mixes polymer blends with different component viscosities, resulting in the elimination of phase inversion. The S3P process directly produces blends with matrix and dispersed phase morphology like those obtained after phase inversion during a long melt-mixing process. This phenomenon is of practical importance because a long processing time is required by conventional melt-mixing to produce a stable blend morphology. S3P is also advantageous for producing thermoplastic or thermoset powder-coating compounds in a one-step process as opposed to a conventional multi-step operation that involves melt extrusion followed by batch grinding. The major capabilities of this new process can be summarized as follows: o Continuous powder production from plastics or rubber feedstocks o Blending of immiscible polymers o Efficient mixing of polymers with unmatched viscosities o Environmentally friendly recycling of multicolored, commingled plastics waste o Sold-state dispersion of heat-sensitive additives o Engineered plastic/rubber blends Materials and processes well illustrated The text is well illustrated with 60 photographs, micrographs, diagrams and others figures. Here is a small sampling of the captions of these figures. o Particle-size distribution for virgin LDPE powder made with PT-25 pulverizer o Optical photograph of virgin LDPE powder made with PT-25 pulverizer o Layout for a three-stage rubber pulverizer o Flow chart for powder coating production by conventional process and with new S3P technology o SEM image of pulverized virgin PP at 40X (first in series of SEM images of polymer powders) o Optical micrograph of melt-crystallized thin films of unpulverized virgin PP under polarized light o Log of viscosity vs. log shear rate for virgin HDPE after S3P processing o Gel permeation chromatograms (GPC) of polystyrene subjected to S3P processing Color-photo section One of the several functions of Solid-State Shear Pulverization technology is recycling mixed plastic waste. This section of twenty full-color photographs and micrographs illustrates different processed materials, as well as the machinery and mixed waste used. Here is a small sampling of the photo and micrograph captions. o Resultant flake feedstock from granulation o S3P-made uniform powder from feedstock o Flake feedstock of post-consumer HDPE/PP blend (90/10 ratio) o Injection-molded test bar (with translucence) made from S3P powder without pelletization o Injection-molded test bar made from S3P powder without pelletization showing uniform color o Several test bars subjected to tensile testing showing exceptionally high elongation at break Useful reference data in tables More than 60 tables provide useful data in convenient form. Here is a small sampling of table captions. o Physical properties of virgin PP 8020 GU injection-molded from S3P-made powder (first in series of tables on physical properties of various plastics processed from S3P-made powder) o Sieve analysis of powder resulting from S3P of virgin LDPE 509.48 (one of series of tables on sieve analysis of polymer powders) o Melt-flow rate before and after S3P processing for virgin PS and two PP samples o Key physical properties of injection-molded post-consumer polyolefin blends pulverized by S3P process The Authors Klementina Khait, M.S. Ch.E., Ph.D., is Research Associate Professor and Director of the Polymer Technology Center in the Department of Chemical Engineering, Northwestern University. Her industrial experience in polymer science and engineering includes work with Borg-Warner Chemicals and Quantum Chemical Corporation. She received her two advanced degrees, in chemical engineering and polymer chemistry, from the Technological Institute, St. Petersburg, Russia. Dr. Khait holds several patents and has published more than 50 papers in scientific and technical journals. Stephen Carr, Ph.D., is Professor of Materials Science and Engineering and Chemical Engineering at Northwestern University. His industrial work includes work in polymer science and engineering with General Motors Corp. He received a doctorate in polymer science from Case Western Reserve University. He has been on the Northwestern University faculty since 1969. Martin H. Mack is Vice President for R&D with the Berstorff Division of Krauss-Maffei Corporation. He holds an engineering degree from the University of Stuttgart. He has served for more than ten years on the Board of Directors of the Society of Plastics Engineers (SPE).

Solid State Shear Pulverization

From the Preface This book is the first extended look at a new and multifaceted polymer processing technology that has already been discussed in numerous articles. Called Solid-State Shear Pulverization (S3P), this innovative process produces polymeric powders with unique physical properties not found in the output of conventional size-reduction

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Solid state Shear Pulverization

From the PrefaceThis book is the first extended look at a new and multifaceted polymer processing technology that has already been discussed in numerous articles. Called Solid-State Shear Pulverization (S3P), this innovative process produces polymeric powders with unique physical properties not found in the output of conventional size-reduction methods.

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Solid state Shear Pulverization

Download or read online Solid state Shear Pulverization written by Naomi Michelle Furgiuele, published by Unknown which was released on 1999. Get Solid state Shear Pulverization Books now! Available in PDF, ePub and Kindle.

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A New Polymeric Powder Technology

Download or read online A New Polymeric Powder Technology written by Dr. Klementina Khait,John M. Torkelson,American Institute of Chemical Engineers,American Institute of Chemical Engineers. Annual Meeting, published by Unknown which was released on 1998. Get A New Polymeric Powder Technology Books now! Available in PDF, ePub and Kindle.

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Investigation of Solid state Shear Pulverization Processing Parameters for Polyethylene clay Nanocomposites

Investigates multiple processing parameters, including polymer type, filler type, processing technique, severity of SSSP (Solid-state shear pulverization) processing, and post-processing, of SSSP. HDPE and LLDPE polymers with pristine clay and organo-clay samples are explored. Effects on crystallization, high-temperature behavior, mechanical properties, and gas barrier properties are examined. Thermal, mechanical, and

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Solid state Compatibilization of Immiscible Polymer Blends

A new class of blend compatibilization relies on the mechanochemical reactions between polymer chains via solid-state, high energy processing. Two contrasting mechanochemical processing techniques are explored in this thesis: cryogenic milling and solid-state shear pulverization (SSSP).

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Intimate Mixing and in Situ Compatibilization of Immiscible Polymer Blends Via an Innovative Process

Thermodynamic and kinetic limitations can hinder the production of finely-dispersed immiscible polymer blends and the compatibilization of immiscible polymer blends via melt-state processing; this thesis represents the first quantitative study of an innovative process, solid-state shear pulverization (SSSP), designed to overcome such limitations. This process employs a modified extruder that

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Study of Pulverization of Low Density Polyethylene Using Solid State Shear Extrusion

Download or read online Study of Pulverization of Low Density Polyethylene Using Solid State Shear Extrusion written by Amir Riahi, published by Unknown which was released on 1996. Get Study of Pulverization of Low Density Polyethylene Using Solid State Shear Extrusion Books now! Available in PDF, ePub and Kindle.

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Compatibilization of Polymer Blends

Compatibilization of Polymer Blends: Micro and Nano Scale Phase Morphologies, Interphase Characterization and Properties offers a comprehensive approach to the use of compatibilizers in polymer blends, examining both fundamental and advanced knowledge in the field. The book begins by introducing polymer blends, describing thermodynamics, miscibility, and phase separation, and explaining

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Reconstituted Polymeric Materials Derived from Post consumer Waste  Industrial Scrap and Virgin Resins Made by Solid State Shear Pulverization

A method of making polymeric particulates wherein polymeric scrap material, virgin polymeric material and mixtures thereof are supplied to intermeshing extruder screws which are rotated to transport the polymeric material along their length and subject the polymeric material to solid state shear pulverization and in-situ polymer compatibilization, if two or

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Tribology of Polymeric Nanocomposites

Tribology of Polymeric Nanocomposites provides a comprehensive description of polymeric nanocomposites, both as bulk materials and as thin surface coatings, and provides rare, focused coverage of their tribological behavior and potential use in tribological applications. Providing engineers and designers with the preparation techniques, friction and wear mechanisms, property information and

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Mechano chemical Effects of Solid State Shear Extrusion Process During the Pulverization of Rubber Granulates

Download or read online Mechano chemical Effects of Solid State Shear Extrusion Process During the Pulverization of Rubber Granulates written by Ecevit Bilgili,Hamid Arastoopour,Barry Bernstein,American Institute of Chemical Engineers,American Institute of Chemical Engineers. Annual Meeting, published by Unknown which was released on 1999. Get Mechano chemical Effects

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Recycling of Post consumer Plastic Waste Via New Solid state Shear Extrusion Pulverization Process

Download or read online Recycling of Post consumer Plastic Waste Via New Solid state Shear Extrusion Pulverization Process written by Klementina Khait,American Institute of Chemical Engineers,American Institute of Chemical Engineers. Annual Meeting, published by Unknown which was released on 1996. Get Recycling of Post consumer Plastic Waste Via New

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Bio Monomers for Green Polymeric Composite Materials

Presents new and innovative bio-based monomers to replace traditional petrochemical-based building blocks Featuring contributions from top experts in the field, this book discusses new developments in the area of bio monomers and green polymeric composite materials. It covers bio monomers, green polymeric composites, composites from renewable resources, bio-sourced polymers, green

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