Material removal in the optical polishing of hydrophilic polymer materials
The optical polishing of hydrophilic polymer materials is a complex process that requires a comprehensive setting of various operating parameters. Based on a series of experimental investigations and dimensional analysis, this paper presents a simple empirical equation to evaluate material removal in the polishing of optical spherical surfaces of hydrophilic polymer materials. It is shown that the polishing load applied governs the material removal, the relative sliding velocity and the sliding distance between the workpiece and polishing tool surfaces. The equation also offers a good reference for the setting of the polishing variables. # 2000 Elsevier Science S.A. All rights reserved.
Soft Contact Lenses. Clinical and Applied Technology
4 pages only and the Retina 10 pages but both are models of succinct writing. The final chapter on The Tears and the Lids is especially useful with some new information on the eyelid during blinking. Professor Fatt indicates in his preface that he has deliberately omitted the electrophysiology of the optic nerve, retina and extra-ocular muscles. This is understandable in the interests of brevity but probably the book could achieve a much wider readership if these were included in any future editions. A most excellent and readable little book which will be obligatory reading for optometric students, those embarking on ocular physiology research and any member of one of the health professions requiring a good introduction to the physiology of the eye.
SMC composites waste management as reinforcing fillers in polypropylene by combination of mechanical and chemical recycling processes
A new process of management of waste of composite materials from Sheet Moulding Compounds (SMC), as reinforcing fillers for thermoplastic materials, including both mechanical and chemical processes is proposed in this paper. Communited SMC being composed of coated glass fibres intimately mixed with calcium carbonate powder, their reinforcing power is low. First, the fibrous part was increased by partial dissolution of calcium carbonate present in the crushed products SMC. Second, a process of partial solvolysis was developed aiming at strong increasing the interfacial mechanical properties by functionalising of SMC load incorporated into polypropylene/grafted maleic anhydride polypropylene (PP/PPgma). At this effect, we investigated a treatment with a hot triamine (diethylenetriamine, DETA) in order to create a functionalisation, after scission of the bond ester of unsaturated polyester, as bridging amino-succinimide.The effect of this recycling way by partial solvolysis was checked from the mechanical properties of the resulting reinforced PP/PPgma material: Although a lower of Young modulus, better yield stress and especially resilience were observed.