By M R Bowditch, J D Clarke, K J Stannard (auth.), K. W. Allen (eds.)

Each 12 months, approximately Easter time, we're reminded of the ongoing progress within the use of adhesives. the yearly convention right here on the urban college presents a focus for dialogue, either formal and casual, on growth and improvement. if you happen to attend the convention its rewards and value are rapid and seen, yet its impact extends to a much wider viewers during the commonplace booklet of the papers. the following in quantity eleven of the sequence we provide the most recent instalment, the papers provided and mentioned in 1986. may perhaps I exhibit gratitude to all those that, by way of their carrying on with aid, either in featuring papers and in attending the assembly, make the full occasion such a success and lucrative. thanks all, greatly. ok. W. ALLEN Vll Contents Preface . v 1. The energy and sturdiness of Adhesive Joints Made Underwater M. R. Bowditch, 1. D. Clarke and okay. 1. Stannard (Admiralty learn institution, Holton Heath,Poole, Dorset, united kingdom) 2. a few features of Silane know-how for floor Coatings and Adhesives 17 C. Kerr and P. Walker (SCT fabrics, Atomic guns learn institution, construction SB43, Aldermaston, analyzing, Berkshire RG74PR, united kingdom) three. Ester Polymers and their interplay with Alumina Studied through Inelastic Electron Tunnelling Spectroscopy . 38 J. Comyn, C. C. Horley, R. G. Pritchard and R. R. Mallik (Faculty of technology, Leicester Polytechnic, PO field 143, Leicester LEI 9HB, united kingdom) four. Ultrasonic Exploration of Adhesive Bonds via Acoustic Microscopy fifty six D. M. Thaker and N. J.

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Figure 4 shows that the use of AAMS produced a marked improvement in the initial bond of the structural adhesive and more importantly, improved the bond strength retention, effectively more than doubling the life of the bond. The results for the flexible adhesive using the same silane are less promising but nevertheless represent an improvement in the working life of the bond. 7. SILANES AND BERYLLIUM The results of a single experiment in which the silane MPS was applied as a pretreatment primer to beryllium and tested by the sandwich technique is shown in Table 17.

IAddi-1 . IAddi-1 . IAddi-1 . IAddiINonelPrlmerltive IPrlmerltive IPrlmerltive IPrlmerltive Bond Strength MPa Coefficient of Variation Site of Failure 5. 9 I I I CF I CS I I MITIGATION OF WATER EFFECTS Specimens of the structural polyurethane and epoxide adhesives on stainless steel were exposed to 100% humidity at room temperature for periods up to 24 months. ints broken before any recovery could take place. The data for the polyurethane adhesive is shown in graphical form in Figure 1. It can be seen that both GPMS and MPS produced a marked increase in bond strength retention, the specimens pretreated with GPMS retained 49% of their original bond strength and MPS 35% compared with 15% for the non-silane control.

05% w/v solution PMMA in acetone, and the relevant peak assignments are given in Table 4. The most significant features are again the strong symmetric and asymmetric stretching vibrations of the carboxylate anion at 1460 cm and 1621 cm -1 -1 respectively, and a reduction in intensity of the carbonyl peak at 1677 cm -[ relative to that of the IR spectrum. This would again suggest acid or base-catalysed hydrolysis of the ester groups to the carboxylate. As proprosed by Hall and Hansma (14), it is believed that carboxylic acids dissociate on the Ai-oxide surface.

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