Download or read book Devolatilization of Polymers written by Alan R. Berens and published by . This book was released on 1983 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Devolatilization written by Ramon Albalak and published by Routledge. This book was released on 2017-09-29 with total page 737 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work introduces the fundamental background necessary to understand polymer devolatilization. It elucidates the actual mechanisms by which the devolatilization of polymer melts progresses, and discusses virtually every type of devolatilization equipment available. The work also addresses devolatilization in various geometries and types of equipment, describing the use of falling strand, slit, single-screw, co-rotating and counter-rotating twin-screw devolatilization.
Download or read book Devolatilization of Polymers written by Joseph A. Biesenberger and published by Oxford University Press, USA. This book was released on 1988-05-12 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details clearly and concisely the state-of-the-art technology of polymer devolatilization, also covering the engineering science aspects. It presents a wide spectrum of topics, including equipment (from flash evaporators and thin-film evaporators to vented single and twin-screw extruders), process mechanisms and models, thermodynamics and transport properties, and analytical methods.
Download or read book Polymer Devolatilization and Some Aspects of Reactive Processing Via Twin Screw Extrusion written by Shah Suresh and published by . This book was released on 1988 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Onset of Boiling and Its Importance in Polymer Devolatilization written by Raquiba N. Hoque and published by . This book was released on 1986 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Trace Devolatilization of Polymers written by Chi-Tai Yang and published by . This book was released on 1995 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Devolatilization and Some Aspects of Reactive Processing Via Twin Screw Extrusion written by Suresh D. Shah and published by . This book was released on 1989 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Investigations of Polymer Devolatilization Processes in Steam Contactors written by Kelly Marie Gabor and published by . This book was released on 2016 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The process of polymer devolatilization is a critical step in manufacturing high quality polymers. Polymer devolatilization is a technique that involves removing unwanted substances, such as unreacted monomers, volatile by-products, solvents, or any other unwanted materials, with the use of superheated steam. The polymer mixture considered here, initially consists of polymer and an excess hydrocarbon solvent like cyclohexane. This polymer mixture is referred to as "cement". To remove the cyclohexane, superheated steam is mixed with the cement, and the steam causes the cyclohexane to evaporate, leaving behind a cement mixture with less solvent and a higher concentration of polymer. As the cement dries out and forms into particles, or "crumb", it is carried away and further processed while the steam and solvent vapor are vented out of the contactor. This process is modeled using computational fluid dynamics (CFD), specifically employing the commercial code, ANSYS FLUENT, to gain insights into the complex phenomena occurring and accounts for several aspects of this multiphase flow problem. The model shows the initial breakup of the cement and the heat transfer and phase change as the solvent evaporates, in addition to tracking the droplet's size, temperature, solvent content, and other important parameters used to monitor the droplet's evolution within the contactor. After completion of the simulation, the cement particle sizes are compared to average values from the field for the actual final product to verify this model. This thesis focuses on modeling two separate contactors, referred to as Contactor A and Contactor B, which differ in shape, but involve the same processes. For each contactor, once a final model is constructed, a parametric study is performed to test for several modifications involving lower levels of steam usage, which can in turn potential reduce the manufacturing cost. Contactor A tested the effects of different initial polymer temperature on the final polymer product. Increasing the cement operating temperature reduced the solvent concentration in the cement crumb significantly, and the final cement crumb sizes showed a slight decrease as well, which indicated a better production performance. For Contactor B, several simulations were carried to determine the effects of changing the operating steam pressure and also several geometric parameters. Simulations were carried out using steam as the only phase to test how the flow rate and residence time were affected with the changes in such operating parameters. After determining an improved geometry modification, a full simulation was carried out with steam and cement particles and compared to the original case. The modified case performed better compared to the original case by providing reduced particle sizes, residence times, and cyclohexane content, all indicating better performance.
Download or read book Fundamental Analysis of Polymer Devolatilization written by Steven E. Zell and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Devolatilization of Concentrated Polymeric Solutions in Extensional Flow written by James F. Nangeroni and published by . This book was released on 1988 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Principles of Polymer Processing written by Zehev Tadmor and published by John Wiley & Sons. This book was released on 2013-12-02 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thoroughly revised edition of the classic text on polymer processing The Second Edition brings the classic text on polymer processing thoroughly up to date with the latest fundamental developments in polymer processing, while retaining the critically acclaimed approach of the First Edition. Readers are provided with the complete panorama of polymer processing, starting with fundamental concepts through the latest current industry practices and future directions. All the chapters have been revised and updated, and four new chapters have been added to introduce the latest developments. Readers familiar with the First Edition will discover a host of new material, including: * Blend and alloy microstructuring * Twin screw-based melting and chaotic mixing mechanisms * Reactive processing * Devolatilization--theory, mechanisms, and industrial practice * Compounding--theory and industrial practice * The increasingly important role of computational fluid mechanics * A systematic approach to machine configuration design The Second Edition expands on the unique approach that distinguishes it from comparative texts. Rather than focus on specific processing methods, the authors assert that polymers have a similar experience in any processing machine and that these experiences can be described by a set of elementary processing steps that prepare the polymer for any of the shaping methods. On the other hand, the authors do emphasize the unique features of particular polymer processing methods and machines, including the particular elementary step and shaping mechanisms and geometrical solutions. Replete with problem sets and a solutions manual for instructors, this textbook is recommended for undergraduate and graduate students in chemical engineering and polymer and materials engineering and science. It will also prove invaluable for industry professionals as a fundamental polymer processing analysis and synthesis reference.
Download or read book Computational Investigations of Polymer Sheet Breakup for Optimization of Devolatilization Processes in Steam Contactors written by Bradley Warren Shindle and published by . This book was released on 2017 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer devolatilization is a vital process in polymer manufacturing and is significantly impactful on the successful creation of high quality polymers, meeting both rigorous product specifications and regulatory requirements. Polymers resulting from such processes have wide applications ranging from agricultural and biomedical solutions to aerospace components and even to modern day clothing and accessories.Although there are several popular methods used to accomplish the devolatilization process, this research focuses specifically on steam stripping, where superheated steam is used to remove any unwanted substances, such as volatiles and solvents, from the polymer mixture. This polymer mixture, referred to as "cement" and comprised of polymer and a cyclohexane solvent, undergoes mixing with superheated steam in a contactor to evaporate and remove the cyclohexane. Between the heat and the aerodynamic forces caused by the mixing, the liquid polymer experiences sheet breakup.The objective of the current study is to create a computational fluid dynamics (CFD) model that solves for the initial breakup of the liquid mixture, and then use the resulting diameter distribution to simulate the trajectory and multiphase mass transfer of the cement as it forms into smaller and smaller droplets. A parametric study is conducted in order to determine the effects of contactor geometry changes on the initial sheet breakup and the resulting impacts to the final polymer product quality. The purpose for modifying the geometry is to increase the uniformity of the breakup as well as reduce the amount of cement that sticks to the contactor walls. The use of CFD allows the industry partner for this research to try multiple different optimization solutions without interrupting production and spending large amounts of money on trial-and-error prototypes.
Download or read book Devolatilization of Polymer in a Rotating Foam Metal Bed written by Ishita Goswami and published by . This book was released on 1994 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern Styrenic Polymers written by John Scheirs and published by John Wiley & Sons. This book was released on 2003-03-28 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title addresses the latest developments in the field, covering the major advances that have occurred over the past five years in the polymerization and structure of new generation polystyrenes that are broadening its scope of application. It covers the advent of branched polystyrenes, syndiotactic polystyrene, high-molecular weight general purpose PS, styrenic interpolymers, and clear SBS copolymers Presents voluminous research previously only reported at conferences in one reference Unique coverage of a topic not found in the field
Download or read book Foam Formation and Diffusive Transport During the Devolatilization of Polymers written by Ingo Gestring and published by . This book was released on 2000 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of Lab Scale Apparatus for Flash Devolatilization of Polymers and Preparing Organic Nanoparticles in a Polymer Matrix written by Partha R. Ayyanger and published by . This book was released on 2001 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Processing and Properties written by Gianni Astarita and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the First Conference of European Rheologists, which was held in Graz, Austria, in April 1982, the Provisional Committee of European Delegates to the Inter national Committee on Rheology held a meeting to discuss future European activities in the general area of rheol ogy. It was agreed, among other things, that the organ ization of meetings in Europe on specific topics related to rheology would be done in cooperation, so as to avoid conflicts of dates and/or subject areas. Any such meeting, if approved by the Provisional Committee, would be named a European Meeting; the European Societies of Rheology would help the organizers with distribution 6f circulars, membership lists, and any required technical assistance. One of the very first meetings organized within this procedural scheme has been the European Meeting on Polymer Processing and Properties, which was held in Capri, Italy, on June 13-16, 1983. This book constitutes the Proceedings of that meeting.
