particularly Mode I delamination, which is now a standard test for determining the fracture energies associated with interfacial (fiber-to-matrix) strengths in high-performance composite materials. The book's utility, however, lies in its being a convenient source of information on the important, and often poorly understood, world of chemistry of interfaces. Computer Integrated Manufacturing, Alan Wetherall, Editor, Butterworths, 1988, 299 pages.

SynopsisThe synthesis of reactive glass fiber having isocyanate groups was tried by reacting silanol groups on the surface of glass fiber with diisocyanate compounds. The effect of solvent, influence of the structure of diisocyanate, and effect of amine catalyst were examined, and results that the reactivity increased with increasing the polarity of solvent, when aromatic diisocyanate was used, and with increasing the basicity of amine catalyst were obtained. Further, glass fiber having isocyanate groups was addition-reacted with diol, and diol added glass fiber was synthesized.

Flexural stress relaxations were measured for rigid polyurethane foams (PUF) and glass‐fiber‐reinforced rigid polyurethane foams (FRU). The results were successfully analyzed in terms of the five element Maxwell model: (1) Samples reinforced with longer fibers exhibit reduced stress relaxation and reduced temperature dependency of stress relaxation; (2) The increased expansion ratio reduces the flexural modulus of both reinforced and non‐reinforced materials, but the stress relaxation tends to increase greatly at the higher temperature for PUF, while not so greatly for FRU; (3) The temperature dependency of E1 decreases as longer fibers are used to reinforce the polyurethane. The dependency is minimal for the polyurethane reinforced with continuous fibers, where the reinforcing effect is maximal; and (4) The activation energy calculated from τ2 according to the Arrhenius plot is smaller for the longer fiber reinforced polyurethane foams.

No abstract

acrylate groups of NTG-GMA and PMDM would probably not polymerize by ionic mechanisms under these conditions). A more detailed understanding of the mechanisms by which this polymerization occurs will allow a broadening of the scope of materials and conditions that are potentially available, and will increase the probability that these in vitro methods will be transferred to industrial and clinical utility. Assays of biological safety, which have commenced, must precede clinical trials.