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Book Review Die rumliche Struktur organischer Molekle (The Steric Structure of Organic Molecules). By Charles C. Price

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different processing characteristics and applications from the
thermoplastic polycarbonates and polyalkylene terephthalates.
The basic division of the earlier volumes“] into constitution,
preparation, structure and properties, and processing and use
is retained for these three plastics. Special sections on cutting
agents, accelerators, inhibitors, glass-fiber reinforcement, and
fillers afe added in the case of the U P resins, corresponding
to their different processing. It would have been interesting
to learn more about the use of polycarbonates and UP resins,
e.g. in the USA. The reason why the section on polyalkylene
terephthalates is rather short is probably that this plastic
was still in the development stage during the preparation
of this volume. One should expect more in a new edition.
It is pleasing to note that a relatively large amount of space
has been given to processing and use in the case of the polycarbonates, though the scientific side has not been neglected
as a consequence. This is also true of the UP resins, but
the sections on aids and fillers, glass fibers, etc. are also very
informative.
The editors have managed to obtain the services of an outstanding specialist for each chapter, and the volume can therefore be regarded as very successful. Access to the original
literature and to patents is facilitated by the extensive bibliography following each chapter. The volume will prove to
be a good, fast source of instruction for processers, engineers,
architects, and electrical engineers, as well as for chemists
and physicists, and can be warmly recommended.
Otto Horn [NB 231 IE]
Die raurnlichestrukturorganischer Molekiile(The Steric Structure of Organic Molecules). By Charles C. Price. “taschentext” Vol. 10. Verlag Chemie, GmbH--Physik-Verlag,
Weinheim 1973. 1st Edit., x, 102 pp., 38 figs., 18 tables,
bound D M 12.80.
The aim of the “taschentext” series for chemistry and biology
students, “to find means for the more effective presentation
of fields, in which several disciplines are involved, and the
purpose of this book, to familiarize these students with the
fundamental factors that determine the principal properties
of materials made from natural o r synthetic polymers, are
very commendable.
However, the title (original edition: Geometry of Molecules,
1971) may mislead the beginner into thinking that the whole
of organic stereochemistry is dealt with here. The different
use of the term “structure” in this connection can be seen
from a comparison of the contents with those of books having
related titles, e. g. Coulson (The Shape and Structure of Molecules), Barrett (Die Struktur der Atome und. Molekule [The
Structure of Atoms and Molecules]), Barry/Barry (Die Struktur biologisch wichtiger Molekule [The Structure of Biologically Important Molecules]), Allinger/AZlinger (Strukturen organischer Molekiile [Structures of Organic Mole-.
cules]).
The material is divided in a logical manner into five chapters:
The Geometry of Small Molecules (19 pp.); Intermolecular
Forces (9 pp.); Dynamic Aspects of Molecular Geometry (23
pp.); Properties of Polymers (26 pp.); and Properties of Biopolymers (15 pp.).
The number of printing errors (pp. 15, 45, 55; 46, 52, 53,
84) is within normal limits. More objectionable are a number
of weak points that could have been avoided: A pair of electrons, for example, spends “more time” in the neighborhood
of the chlorine atom (p. 14).The title of the section “Asymmetric
pp.) and also
(Chiral) Molecules”, which is too short (1
~~
[*I
Cf Angew. Chem. internat. Edit. I f . 947 (1972)
826
tedious (compare the lively chapter “Molecular Dissymmetry”
in Barry/Barry, see above), is didactically by no means the
best, nor are the unusual arrangement of the lactic acid formulas (p. 17) and the representation of inversion at the amine
nitrogen (p. 18).The name Perlon should at least be mentioned
in the discussion of 6,6-nylon (p. 69). The designation trans
should not be applied to single bonds (p. 52). A note about
the non-drop-like shape of p-orbitals would have been useful
on p. 15. In the drawings of molecular models (pp. 16, 17),
the bonds lying in the same plane should have been drawn
as lines of equal thickness; the striped bonds are disturbing.
The word “gefaltet” (folded) should have been used instead
of “gebuckelt” (buckled) (cyclopentane ring, p. 45). On p.
47, orbital and molecular models are twisted in relation
to each other, though they are placed together for comparison.
On the same page there are formulas and corresponding projections that are rather disordered in space.
However, these weaknesses in a few details are more than
outweighed by the convincing explanations in the text, which
arouse understanding of and above all interest in the “giant
molecules”.
On the whole, the book fills a gap. The combination of elementary stereochemistry, polymer chemistry, and biochemistry
in such a small space may be regarded as successful. This
introduction can be recommended not only to those addressed
in the foreword, but also to those who are fully trained in
neighboring disciplines.
Fritz Vogtle [NB 232 IE]
Elektrotauchlackierung (Electropainting). By W. Ma&.
Verlag Chemie GmbH, Weinheim 1974.1st Edit., x, 338 pp.,
133 figures, 32 tables, bound DM 98.,
It has not taken many years for electropainting to find wide
application as an economic process. Numerous publications have appeared during this time, dealing with the development of coating materials and the latest situation regarding
plant and engineering. In the present book W M a c h has
evaluated a considerable part of this literature and worked
it up into a comprehensive review of this modern technique.
He deals here with the physical and chemical. principles of
. anodic deposition of paint, the importance of voltage and
current strength, the throwing power, pretreatment of the
metal, the composition and testing of the varnish materials,
special fields of application, plant and procedures, and economic considerations. In conclusion, there is an extensive review
of patents. Thus, the book is of equal interest to users and
to manufacturers of paints and plants.
The mechanism of film formation by means of electropainting
and the influence of the various paint and deposition parameters on the resulting coating are not yet fully understood.
The section of the book dealing with this subject adds nothing
to existing knowledge : the sometimes inadmissible generalizations of experimental results on specialized varnish systems
that are found in the literature cited are here reported without
discussion.
The chapters about pretreatment of the metal before electrodeposition varnishing are very detailed. The author’s extensive
experience with metal cleaning and phosphatizing makes
this part of the book a valuable source of information for
both users and paint manufacturers. It is disturbing that the
pretreatment process of only one supplier is cited. The chapters
about paint formulation and supervision of the immersion
bath are brief, and are necessarily incomplete for a process
whose further development is still under active study.
The descriptions of plant and procedure in electropainting
with their numerous illustrations and examples of application,
provide a good review of possible applications of the process. Many technical details of the plants are of interest to
Angew. Chem. internat. Edit.
Voi. 13 (1974) 1 No. 12
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