By D. C. Blackley (auth.)
ISBN-10: 9401064792
ISBN-13: 9789401064798
ISBN-10: 9401158665
ISBN-13: 9789401158664
Polymer Latices, moment Edition is a accomplished replace of the former variation, High Polymer Latices, making an allowance for the numerous advancements because it was once first released in 1966. it's the purely book to supply such a great and broad overview of latex technology and expertise, from historical past concept and ideas, to trendy day purposes. it's going to turn out a useful reference resource for all these operating within the region of latex technology and expertise, equivalent to colloid chemists, polymer scientists, and fabrics processors.
Read or Download Polymer Latices: Science and technology Volume 2: Types of latices PDF
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Extra resources for Polymer Latices: Science and technology Volume 2: Types of latices
Example text
Whilst it is still in the collecting cups and buckets. 1 below). The ammonia is supplied to the latex from anhydrous liquid in cylinders, rather than as concentrated aqueous ammonia solution. There are two reasons for preferring the anhydrous liquid to concentrated aqueous solution. Firstly, the concentrated aqueous solution is more hazardous to handle under tropical conditions than is the anhydrous liquid in cylinders. Secondly, there is a tendency for the concentrated aqueous solution to cause local coagulation of the latex.
The first postulates that the process is primarily a consequence of the development of acidity through the interaction of microorganisms with the various non-rubber constituents of the latex. The second attributes the effect to the liberation of fatty-acid anions through the hydrolysis of various lipid substances present in the latex. Such anions are then thought to be adsorbed at the surfaces of the rubber particles, possibly partially displacing adsorbed proteins. They then interact with divalent metal ions, such as those of calcium and magnesium, which are either present in the latex initially or else are gradually released from complexes by the action of enzymes.
Spontaneous coagulation, and its sensitization by carboxylate soaps, depends upon the presence of divalent metal ions, such as those of calcium and magnesium. If these are absent, then unpreserved latex can be kept in a fluid condition for a longer period until putrefaction commences. 4. The proportion of ether-soluble substances in the rubber coagulum which is obtained by precipitation with alcohol decreases with time after tapping. Furthermore, with the passage of time, the saponification value of the ether extract falls to a shallow minimum and then increases again.
Polymer Latices: Science and technology Volume 2: Types of latices by D. C. Blackley (auth.)
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