City Research Online

Abstract

After a review of previous work it contains a description of the setting up and testing of a vacuum line containing an electronic microbalance for the determination of adsorption isotherms for water, nitrogen and ethanol on finely divided palladium, The isotherms are treated to give information regarding the metal surface including heat of adsorption, and the entropy changes on adsorption, ‘ These are treated to give the state of mobility of the adsorbed layer,

The choice of an adhesive is then discussed together with the design of an apparatus for the manufacture and testing of bonds which have been made and stored under known conditions of relative humidity, The adhesive finally chosen was a polyester cross-linked with styrene and polymerised at room temperature using benzoyl peroxide initiator together with N N Dimethyl toluidine accelerator. The test pieces were of the pull through type.

The work continues with an examination of the surface properties of the adhesive by measurement of liquid contact angles and surface free energies for water, ethanol/water mixtures and tricresyl phosphate, the last named providing information as to the solid surface free energy with respect to dispersion interactions only.

The last chapter brings together the preceding work and shows how the observations of the adhesion tests may be justified by considering the free energy change for displacement by water. Some suggestions for further work are included.

Publication Type:	Thesis (Doctoral)
Subjects:	Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology
Departments:	School of Science & Technology > Department of Engineering School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses

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