Marcel Mulder (auth.)'s Basic Principles of Membrane Technology PDF

By Marcel Mulder (auth.)

ISBN-10: 0792309790

ISBN-13: 9780792309796

ISBN-10: 9401708355

ISBN-13: 9789401708357

Membranes playa vital function in our everyday life, or as indicated by means of certainly one of my overseas colleagues, Richard Bowen, 'If you're uninterested in membranes, you're uninterested in lifestyles' . organic membranes are not often utilized in business purposes, yet separations with man made membranes became more and more very important. this day, membrane approaches are utilized in a variety of functions and their numbers will surely elevate. hence, there's a want for good knowledgeable and certified engineers, chemists, scientists and technicians who've been taught the fundamental ideas of membrane know-how. besides the fact that, regardless of the growing to be significance of membrane tactics, there are just a few universities that come with membrane expertise of their usual curricula. one of many purposes for this can be the shortcoming of a entire textbook. For me, this was once one of many using forces for writing a textbook at the simple ideas of membrane expertise which gives a huge view at the numerous features of membrane know-how. I realize that membrane know-how covers a extensive box yet however i've got attempted to explain the elemental ideas of a few of the disciplines. even though the e-book was once written with the coed in brain it might probably additionally function a primary creation for engineers, chemists, and technicians in all type of industries who desire to examine the fundamentals of membrane technology.

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E. a polyimide (PI) and a poly(ether imide) (PEl) (see figure II - 26). Polyacrylonitrile (PAN) is a polymer which is commonly used as material for ultrafiltration membranes (see table II - 2 ). Despite the nitrile group being a very strongly polar group, the polymer is not very hydrophilic. g. vinyl acetate or methylmethacrylate) is often added to increase chain flexibility and hydrophilicity. CHAPTER II 46 Poly sulfone (PSf) Polyethersulfone (PES) Figure II - 25. The chemical structures of poly sulfone (PSf) and poly(ether sulfone) (PES) o II 0 II +

Dispersion forces are the weakest, but also the most common, forces capable of inducing chain interaction. The strongest secondary forces are hydrogen bonds. These appear when a hydrogen atom, attached to an electronegative atom such as oxygen (hydroxyl), is attracted by an electronegative group in another chain. In particular the following types of attraction are very strong: - 0 ... H ... 0-, -N... H ... O- and -N ... H ... N-. The forces in these cases can be so strong that the polymer can hardly be dissolved, as demonstrated by polyamides and cellulose, for example.

Some elastomers with their corresponding Tg value polymer polydimethylsiloxane polybutadiene polyisoprene natural rubber polyisobutylene butyl rubber polychloroprene Tg ('C) - 123 85 73 72 70 65 50 polymer is in the glassy state, whereas above Tg the polymer is rubbery. Because the working temperature is around room temperature (or a little lower) in many membrane polydimethylsiloxane (silicone rubber) polyisobutene (butyl rubber) pol ybutadiene polychloroprene polyisoprene Figure II - 17. The chemical structures of some elastomers.

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Basic Principles of Membrane Technology by Marcel Mulder (auth.)


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