Cure of Thermosetting Resins
Plywood doors being removed from steam curing press COURTESY MENQEL 00. AND ROHM & HAAS
DEGREE OF CURE IN THERMOSETTING RESINS
Eugene Barr.
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72
Leon Shechter and John Wynstra.
ULTRASONIC WAVtS AS A MEASURE OF CURE
A. G. H. Dietz, E. A. Hauser, F. J. McGarry, and G. A.Sofer.
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CROSS LINKING OF A PHENOL-FORMALDEHYDE NOVOLAC
M. F.
Drumm, C. W. H. Dodge, and L. E. Nielsen.
.
GLYCIDYL ETHER REACTIONS WITH ALCOHOLS, CARBOXYLIC ACIDS, AND ACID ANHYDRIDES
PHENOLS,
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86
GLYCIDYL ETHER REACTIONS WITH AMINES
75
76
Leon Shechter, John Wynstra, and Raymond Kurkjy..
P.
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EPOXY CASTING LIQUID POLYMER
Keith
RESINS
R. Cranker
MODIFIED
WITH
POLYSULFIDE
and Alan J. Breslau.
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94
98
REACTION AND CURE IN MELAMINE PLASTICS
H. P. Wohnsiedler, I. H. Updegraff, and R. Hunt,Jr.
EFFECT OF GLASS FIBERS ON CURE OF SILICONE RESINS
H.
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82
Division of Paint Varnish, and Printing I n k Chemistry, 127th ileeting. ACS, Cincinnati, Ohio
This symposium was given a broad title to permit a discussion of important aspects of cure. The purpose of the symposium i s to review our present knowledge of cure and to present the latest techniques which have been developed in bringing about a better understanding of it. In connection with this subject the questions arise: How can cure be defined or in what terminology can it be expressed? How can it be measured? What is the relationship of degree of cure to the properties of a cured resin or plastic? How can it be controlled? What influence do various catalysts, fillers, or substrata exercise on cure? Thermoseiting resins from their inception presented January 1956
H. A. Clark and
K. R.
Hoffman.
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I04
CATALYSIS OF UREA-FORMALDEHYDE CONDENSATION
1. J. Gruntfest and E. M. Young, Jr..
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107
special problems which acted as a deterrent to investigation of their cured state, Despite this, new materials with highly useful new properties have become available, and the technology of the older plastics has made notable advances. Furthermore, the application of new physical and chemical techniques and the study of curing reaction mechanisms are gradually reducing the complexity of these materials. In this symposium thermosetting resins are dealt with as a unified group, but it is hoped that by this treatment some of the basic and unifying principles will be made more evident and thereby prove of value to the group as a whole. H. P. WOHNSIEDLER
INDUSTRIAL AND ENGINEERING CHEMISTRY
71
