POLYMER LETTERS VOL. 8, PP. 449-45 1 (1970)

Aspects of Adhesion 5, Edited by D.J. Alner, Chemical Rubber Co. Press, Cleveland, Ohio, Pages 304, Price $17.50

This fifth volume on aspects of adhesion contains the papers of the 1967 and 1968 conferences on adhesion held at the City University, London. The con- tributed articles from the 1967 conference review the many methods for testing of adhesive joints and their behavior in specific industrial applications. The papers presented at the 1968 conference are more concerned with the funda- mental aspects of adhesion, with a greater emphasis on the role of surface energy in explaining adhesion mechanisms.

Checking the strength of adhesive bonds is covered with chapters on bond testing techniques, the strength of lap joints, and destructive and nondestruc- tive testing of adhesive joints. The authors clearly point out that a single tech- nique for testing adhesive bonds is not available and that an optimum test for monitoring bond strength will not be available to the technologist in the near future. The chapter on bond testing techniques presents a very extensive list of general and specific refcrences for the various available nondestructive tech- niques (e.g., ultrasonic resonance, acoustic, thermal, eddy current, radiography, and direct strain measuring techniques). In addition to the cohesive strength of the adhesive, the geometry of the adhesive-adhered system plays an important role in forecasting the strength of a lap joint. Proper design engineering has also demonstrated that adhesive bonding is capable of distributing stresses and strains in industrial adhesive applications. This book also includes a very interesting chapter on the effect of moisture on adhesive bonds since so many adhesive joints lose strength in humid environments.

electronics, adhesives in footwear manufacture, and bonding systems for plastics. These chapters present the industrial processes for creating the ad- hesive bond and the specific testing methods relative to these industries. In dealing with plastic substrates in the adhesive bonding system, the author es- tablishes the criteria for the selection of the appropriate adhesive, solvent, bond- ing procedure, and test method. It is also pointed out that much more work is needed on the theoretical basis of plastics bonding. From a practical point of view, high-volume plastics bonding applications, such as in the automobile in- dustry, require improved high-speed methods of surface pretreatments, adhesives with extended pot life, and physical methods for bonding thermoset plastics.

For the technologist, this volume includes extensive articles on adhesion in

449 @ 1970 by John Wiley & Sons. Inc.

450 POLYMER LETTERS

The fundamental portion of the book includes chapters on surface energy and its significance in adhesion, the nature of adhesive forces, surface condi- tions, and interfaces. Even these fundamental chapters are connected to speci- fic effects observed in polyethylene, gummed paper tape, and epoxy adhesives.

Although some of the chapters in the book are shy of adequate references, this fifth volume on the Aspects of Adhesion does contribute to the many facets of adhesion and will ultimately yield an encyclopedia on adhesion and adhesives.

Philip Weiss

General Motors Research Laboratories Warren, Michigan 48090

Received May 12, 1970

High Speed Testing, Volume VII The Rheology of Solids.

Rodney D. Andrews, Jr., and Frederick R. Eirich, Co-Chairman

Wiley, New York, 1969 ix+307 pp. - $10.00

This twelfth volume in the Applied Polymer Symposia series is the proceed- ing of the Seventh International Symposium on High Speed Testing sponsored by Plas-Tech Equipment Corporation, Natick, Mass. That contributors to the symposium represented eight industrial laboratories and five academic institu- tions indicates a substantial interest in strain rate effects on the behavior of materials.

order of lo2 sec-l. Some measurements were made at higher strain rates using ballistic methods. Most of the data is for the tensile behavior of materials. The materials investigated range from polymers to metal and glass yams and from graphite to human bone. In addition to material property reports, there are two theoretical papers-one attempts to give a unified discussion of strain rate effects using atomic models and the other is a vibration analysis of a high speed test machine. Not all papers deal with tensile deformations. The com- pressive behavior of foam materials is reported as well as the dynamic response of filled polymers to oscillatory stresses. The most unusual paper of the sympo- sium deals with the impact penetration behavior of human skull bone. A unique combination of test equipment and test sample sources was available for that study.

In this book, "high speed" means measurements taken at strain rates on the

(c>1970 by John Wiley & Sons, Inc.