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Published: 1995
Total Pages: 488
ISBN-13:
DOWNLOAD EBOOKLists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: J.F. Rabek
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 607
ISBN-13: 9400907478
DOWNLOAD EBOOKDuring the last two decades, the production of polymers and plastics has been increasing rapidly. In spite of developing new polymers and polymeric materials, only 40-60 are used commercially on a large scale. It has been estimated that half of the annual production of polymers is employed outdoors. Increasing the stability of polymers and plastics towards heat, light, atmospheric oxygen and other environmental agents and weathering conditions has always been a very important problem. The photochemical instability of most of polymers limits them to outdoor application, where they are photo degraded fast over periods ranging from months to a few years. To the despair of technologists and consumers alike, photodegrada tion and environmental ageing of polymers occur much faster than can be expected from knowledge collected in laboratories. In many cases, improved methods of preparation and purification of both monomers and polymers yield products of better quality and higher resistance to heat and light. However, without stabilization of polymers by applica tion of antioxidants (to decrease thermal oxidative degradation) and photostabilizers (to decrease photo-oxidative degradation) it would be impossible to employ polymers and plastics in everyday use.
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Published: 1975
Total Pages: 882
ISBN-13:
DOWNLOAD EBOOKAuthor: Jan F. Rabek
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 222
ISBN-13: 3642800904
DOWNLOAD EBOOKIn this book on physical characteristics and practical aspects of polymer photodegradation Rabek emphasizes the experimental work on the subject. The most important feature of the book is the physical interpretation of polymer degradation, e.g. mechanism of UV/light absorption, formation of excited states, energy transfer mechanism, kinetics, dependence on physical properties of macromolecules and polymer matrices, formation of mechanical defects, practics during environmental ageing. He includes also some aspects of polymer photodegradation in environmental and space condition.
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Published: 1975
Total Pages: 640
ISBN-13:
DOWNLOAD EBOOKAuthor: Roger Lee Clough
Publisher:
Published: 1991
Total Pages: 656
ISBN-13:
DOWNLOAD EBOOKHere is the most extensive resource on polymer radiation effects to be available in more than a decade. This new volume reviews the fundamental chemistry and physics of polymer-radiation interaction and examines recent progress in most major areas of the field. Its 38 chapters, written by leading experts from around the world, cover: fundamentals of polymer radiation chemistry; technological applications of radiation to polymers (including radiation processing; radiation curing; sterilization; cross-linking, polymerization, grafting, X-ray resists, and others); and degradation of stabilization of irradiated polymers (including nuclear plants, scintillation detectors for particle physics, and others).
Author: Carl N. Kramer
Publisher: Nova Publishers
Published: 2007
Total Pages: 326
ISBN-13: 9781600218248
DOWNLOAD EBOOKUntil 1985, the chemical element Carbon was only known to exist in two forms -- diamond and graphite. This changed when Kroto and co-workers discovered an entirely new form of carbon, which became known as C60 or the fullerene molecule. (This discovery later led to their award of the 1996 Nobel Prize in Chemistry.) The original discovery of C60 was in the soot produced from the laser ablation of graphite. Since then, other methods of production have been developed. It is also thought that isolated C60 molecules may be found in stars and interstellar media. It was soon discovered that C60 is not the only ball-like carbon molecule possible (although it is the most stable and the most dominant). The rugby-ball shaped C70 molecule is another possibility. In nanotechnology, the potential applications of carbon nanotubes (formed by combining hexagonal rings of carbon atoms only, rather than hexagons and pentagons as in C60) for very small electronic devices are currently the subject of much activity. This book presents the latest research in this dynamic field.
Author: Roger P. Brown
Publisher: iSmithers Rapra Publishing
Published: 2004
Total Pages: 108
ISBN-13: 9781859574607
DOWNLOAD EBOOKPolymers have been used in agriculture and horticulture since the middle of the last century. There is a tremendous potential for using polymers in agriculture and our fields and garden would look very different if we did not use polymers in them. This review traces the history of polymer use, discusses the markets for polymers in these applications, and describes in detail the different types of polymers that can be used and their specific applications. An additional indexed section containing several hundred abstracts from the Polymer Library gives useful references for further reading.
