Book Description
the material has a tendency to form dendritic crystals. The polymer was thermally stable up to about 400$\sp\circ$C in air.
Author : HIMANSU M. GAJIWALA
Publisher :
Page : 410 pages
File Size : 33,74 MB
Release : 1992
Category :
ISBN :
the material has a tendency to form dendritic crystals. The polymer was thermally stable up to about 400$\sp\circ$C in air.
Author : Eugene Louis Mainen
Publisher :
Page : 194 pages
File Size : 21,80 MB
Release : 1968
Category : Polymers and polymerization
ISBN :
Author : K. L. Mittal
Publisher : VSP
Page : 554 pages
File Size : 34,58 MB
Release : 2003-03
Category : Technology & Engineering
ISBN : 9789067643788
Annotation Containing 32 peer-reviewed papers, this volume documents the proceedings of the international symposium of the same name (held under the aegis of the Materials Science and Technology Conferences) in December of 2001. Devoted to research into high-temperature polymers, the papers are organized into sections dealing with synthesis, properties, and bulk characterization in the first half and surface modification, interfacial or adhesion aspects, and applications in the second. Annotation (c)2003 Book News, Inc., Portland, OR (booknews.com).
Author : Kash L. Mittal
Publisher : CRC Press
Page : 436 pages
File Size : 33,38 MB
Release : 2009-04-24
Category : Science
ISBN : 9047424115
This volume documents the proceedings of the "Second International Symposium on Polyimides and Other High Temperature Polymers: Synthesis, Characterization and Applications, held in Newark, New Jersey, December 3-6, 2001. Polyimides possess many desirable attributes, so this class of materials has found applications in many technologies ranging fro
Author : Edmund Elce
Publisher :
Page : 294 pages
File Size : 11,83 MB
Release : 1995
Category :
ISBN :
"Novel amorphous thermoplastic poly(phenylquinoxaline)s (PPQ), poly(aryl ether ketone)s (PAEKs) and poly(aryl ether phthalazine)s have been synthesized." --
Author : Buxuan Li
Publisher :
Page : 70 pages
File Size : 43,16 MB
Release : 2021
Category :
ISBN :
Polymers have infiltrated almost every aspect of modern technology. Without polymer products, the society would look very different. As one of the most important and common engineering materials, traditional polymers are both electrically and thermally insulating, due to its organic nature and amorphous structures. In the late 20th century, electrically conductive polymers has been discovered. Thermally conductive polymers, however, were not demonstrated until the recent decades. Polymers are shown to have great potential in thermal conduction, even divergent thermal conductivity in theory. This counterintuitive finding is attributed to its one-dimensional periodic structure, where repeating monomers are connected by strong covalent bonds. Researchers have learned that special dynamics exist in non-linear one-dimensional chains since the Fermi-Pasta-Ulam-Tsingou report, where the evolution of state space was found to be non-ergodic, enabling an infinite long lifetime of excitations. As a result, such 1D nonlinear system favors scatter-free phonon transport. Molecular dynamics simulation shows a single polyethylene (PE) chain could have divergent thermal conductivity. Calculations from first principle also confirm the thermal conductivity is approximately 160 W/mK for bulk PE and 1400 W/mK for a single PE chain, with a three phonon process taken into consideration. In experiments, researchers measured enhanced thermal conductivity in stretched PE in the 1970s. In the last decades, researchers have made progress by demonstrating PE nanofibers with a thermal conductivity of over 100 W/mK. Recently, 2D PE films were fabricated and measured to have metal-like thermal conductivity of over 60 W/mK. With all these progresses, in this thesis, we aimed to develop scalable polyethylene films with high thermal conductivity and investigating temperature-dependent thermal transport properties. A differential steady state method was used to measure the thermal conductivity of the synthesized PE films. A thermal annealing of PE films was performed along with the temperature dependence test where a transition temperature was identified. Below the transition temperature, thermal annealing increased the thermal conductivity at room temperature. Above the transition temperature, thermal annealing irreversibly decreased the thermal conductivity. Our PE films featured reasonable thermal conductivity of 20~60 W/mK depending on draw ratio and much lower density comparing to metals such as copper and aluminum. A potential application of such films is a light-weight thermal strap, which is important for space technologies. We designed a strategy to overcome the issue that such films have a poor cross-plane thermal conductivity. We proved the idea based on both simulation and experiments. In simulations, we derived a steady state solution of a full-size physical device with conduction and radiation included. In experiments, we conducted a unit test on laboratory scale samples and argued its ability of scaling up by showing that multilayer PE films performed as expected.
Author : K. L. Mittal
Publisher : CRC Press
Page : 588 pages
File Size : 38,35 MB
Release : 2005-04-18
Category : Science
ISBN :
The topics covered in this proceedings volume include: Synthesis, characterization and processing (including some novel approaches) of a variety of polyimides and other high temperature polymers; structure-property relationships; segmental dynamics in polyimide materials; photoalignable polyimides; photoconductivity and photosensitivity of polyimides; ultrafiltration membranes from polyetherimide; polymer materials for nonlinear optical applications; alignment of SWNTs in rigid-rod polymer compositions; surface modification of polyimide; adhesion of Cu to polyimide surfaces; and polyimide erosion in a low Earth orbit space environment.
Author : Eugene Herman Engelhardt
Publisher :
Page : 84 pages
File Size : 22,47 MB
Release : 1961
Category :
ISBN :
Author : Hoh-Jiear Yan
Publisher :
Page : 167 pages
File Size : 20,16 MB
Release : 1983
Category :
ISBN :
Author : Kash L. Mittal
Publisher : CRC Press
Page : 435 pages
File Size : 49,27 MB
Release : 2007-07-10
Category : Technology & Engineering
ISBN : 9067644544
This book is mostly based on papers presented at the Fourth International Symposium on this topic held in Savannah, Georgia. However, in addition to these papers, certain very relevant papers have also been included to broaden the scope and thus enhance the value of this book. Currently there is tremendous interest in these material because of their unique properties and applications in diverse technological areas ranging from microelectronics to aerospace to adhesive bonding. This book is divided into three parts: Part 1: Synthesis and Bulk Characterization; Part 2: Surface and Interface Aspects (Composites and Metallization); and Part 3: Applications. The topics covered include: synthesis of a number of polyimides with tailored properties; nanocomposites for high-performance applications; molecular assembly of polyimides; polyimide L-B films; metallization of polyimides; applications of high temperature polymers as proton exchange membranes; dielectrics, and in textile.