close

Вход

Забыли?

вход по аккаунту

?

Book Review Electrical Properties of Polymers. Edited By D. A. Seanor

код для вставкиСкачать
M . A . A . Clyne and I . S . McDermid report on laser-induced fluorescence as a method of investigating the electronically excited states of small molecules. Much has
been learned about the dynamic and spectroscopic properties of small molecules and radicals, which have been excited under precise, defined conditions, by means of tunable, narrow band dye lasers. The experimental technique is
also comprehensively described. As much progress has
also occurred in the area of multiphonon excitation with
infrared quanta. D. S . King reports on chemical reactions
influenced by such excitation, molecular dynamics, energy
transport and distribution of excitation energy among the
products following multiquantum infrared excitation.
The subject of the contribution by A . M . F. Lau is laser
predissociation and autoionization by photons. S . R .
Leone discusses the results of single photon ionization and
dissociation of molecules. The distribution of the endproducts, the dissociation time, the fluorescence polarization and the angular distribution of the products allow a
detailed insight into the primary photochemical processes.
Excited metal atoms can pass on their energy in collision
with molecular gases. W . H . Breckenridge and H . Umemoto
report on this area which is of such great importance for
laser technology. I. V. Hertel’s contribution is concerned
with the energy exchange between electronic and vibrational excitation. The measurement of effective cross sections, angular distributions and polarization are discussed.
Exclusively or mainly theoretical methods and results
are discussed by M . Quack (The Reaction Dynamics and
Statistical Mechanics of the Production of Highly Excited
States by High Intensity Infrared Radiation), by D. M .
Hirst (Calculation of the Potential Surfaces of Excited
States) and T. A . Brunner and D . Priichard (Fitting Laws
for the Treatment of Rotation Inelastic Collisions).
Taken as a whole this book allows an insight into the basic concepts and into the latest results in some areas of molecular physics where-because of the advent of the laser-there have been especial advances in recent years. The
individual contributions are well written, fit quickly and
understandably into the general scheme, and include a tremendous number of literature references. Such books are
of inestimable value to the molecular physicist and the
physical chemist. The production is excellent, the price acceptable.
H. C. Wolf [NB 582 IE]
Physikalisches Institut
der Universitat Stuttgart
Electrical Properties of Polymers. Edited by D. A . Seanor.
Academic Press, New York 1982, xi, 379 pp., bound, $
52.00.
The tendency of publishers to assemble a range of individual reports of varying quality and with only a slight
connection with each other and to market them is unfortunately increasing. This book is an example of the abuse.
In the first chapter D . A . Seanor gives a cursory review
of electrical phenomena, measuring techniques and the
electrical properties of various material classes and states
of aggregation of polymers, under the title “Electrical
Conduction in Polymers”. The polymers with metal-like
conduction (e.g . the polyacetylenes), which are decisive in
recent work, are only mentioned here, as in the rest of the
book, in passing. The section on ionic conduction in polymers is interesting, although, here too, there is no menAngew. Chern. Int. Ed. Engl. 22 (1983) No. I 1
tion of the PEO salt complexes which are relevant for electrochemical applications.
It is characteristic of the quality of the article and of the
book in general that the problem of the connection between the electrical properties and morphology of partially
crystalline polymers are discussed in terms of an outdated
model proposed by Flory (not Florey as given in the legend
to Fig. lo!) dating from the year 1953!
Under the ambitious title “Structure and Charge Generation in Organic Molecular Self Assemblies”, J . H. Perlstein deals in Chapter 2 (30 pp.) solely with thiapyrylium
salts dispersed in polycarbonate. It becomes clear that not
even the structure of the interstitial complex has been unequivocally established.
The topic “Photophysical Processes, Energy Transfer
and Photoconduction in Polymers” is treated by R . F. Cozzens in ca. 30 pages in Chapter 3. Without going into details there is a very elementary introduction, attended by a
plethora of historical citations concerning the photoconductivity of polymers and its technical application.
Chapter 4 (80 pp.) by V. Y. Merrit, entitled “Photovoltaic Phenomena in Organic Solids”, devotes all of 11 lines
to the subject of polymers. The author’s remark that polymers behave in a very complex manner is diverting in the
context of this book.
The subject matter of the 5th chapter by H. Carr (20 pp.)
has been treated several times recently in other monographs and progress reports. The same applies to the remaining chapters of the book; in some cases similar reviews have recently been published elsewhere by the same
authors. An example is G. M . Sessler’s contribution “Polymeric Electrets” in Chapter 6 (40 pp.). The two remaining chapters deal with “Contact Electrification of Polymers” ( D . K . Davies, 40 pp.) and with “Dielectric Breakdown Phenomena in Polymers” (P. Fisher, 45 pp.).
Whoever buys this book will at least enjoy its solid getup
and the careful work of the bookbinder.
Gerhard Wegner [NB 591 IE]
Institut fur Makromolekulare Chemie
der Universitat Freiburg
Anthracycline Antibiotics. Edited by H. S . El Khadem. Academic Press, New York 1982. xii, 285 pp., bound, $
25.00.
This volume is a compilation of the presentations at the
Anthracycline Symposium held in New York in August
1981. The choice of topics takes account of the interdisciplinary character of anthracycline chemistry-ranging
from pharmacology through microbiology to total synthesis.
In the first report Narayanan et al. present the National
Cancer Institute’s (NCI) screening programme for anthracycline derivatives. Besides an introduction to the evaluation of screening results a good summary is given of the
range of substances (ca. 400) prepared to date by derivatization of daunorubicin. Scientists not working in the field
will note that the NCI’s screening results occasionally differ from those of other groups. Next Arcamone et al. report
on the results of investigating doxorubicin (adriamycin).
The group from Farmitalia has made important contributions, both in the area of structure effectivity relations and
in the isolation and synthesis of new glycosides. It is sufficient here to mention the syntheses first reported of a
furanoglycoside and of enantio-4-demethoxydaunorubicin
which, as expected, is biologically inactive. T. Oki summarizes the work of the Sanraku Ocean group in his contribution. This Japanese company is to be thanked for the
895
Документ
Категория
Без категории
Просмотров
1
Размер файла
155 Кб
Теги
polymer, properties, book, edited, electric, seanor, review
1/--страниц
Пожаловаться на содержимое документа