Kurrol salt

Some of these compounds exist in more than one form with different configurations of the (P03) chain, as in the so-called Maddrell and Kurrol salts (two forms of NaP03). The nature of the chains in Na, K, Rb, Ag, and Pb metaphosphates and in LiAs03 and NaAs03 illustrated in the discussion of tetrahedral structures in Chapter 23. A complex configuration of the chain, with 8 tetrahedra in the repeat unit, is found in [Na3H(P03)4]... 

T Linear Pbff03)2( l Helical NaP03 (Kurrol salt A),( ) AgP03( ) ... 

The material is obtained in the form of characteristically long fibrous needles, each containing polyphosphate chains lying in the direction of the fibre axis. Kurrol and Maddrell salts are both high-molecular-weight polyphosphates which exhibit the properties of high polymers. Both are insoluble in water and hydrolyse relatively slowly, although Kurrol salt will dissolve in the presence of different alkali metal cations. 

Kuhni contacters, 10 778 Kujimycins, 15 280 Kunster marrow needle, 3 743 Kurnakov test, 19 656 Kurrol s salts, 13 848 Kuruma shrimp, common and scientific names, 3 188t K X rays, 21 311 KX zeolite. See Zeolite KX Kyanite, 2 345t in clays, 6 685 in coal, 6 718 Kynarflex, 7 641 Kynar SL, 7 641 Kynol fibers, 13 797 Kyoto Protocol, 11 721 KY zeolite. See Zeolite KY... 

A range of high-molecular alkali polyphosphates occur in several crystalline forms. In the case of the sodium and potassium compounds the trivial names Maddrell s and Kurrol s salts have been adopted and these... 

Fio. 9. Various chain types in crystalline high-molecular phosphates (a) (LiPCh) low temperature form (b) Rb(P03)x (c) (NaPCb) Maddrell s salt (high temperature form) (d) (NaP().i)x Kurrol s salt. 

In the system (KII2P04—H3P04) high-molecular potassium polyphosphates are formed on heating, together with acid mono- and di-phosphate but only a little oligophosphate (363). But tertiary P04 tetrahedra occur not only in phosphates with Na P < 1. They can also be detected in Graham s and Kurrol s salt with Mr P = 1 (224, 284, 85, 86) and are also formed in melts of anhydrous trimetaphosphates, especially in a dry atmosphere (364). Their equilibrium concentration in the melt is about 2%. 

Potassium Metaphosphate Potassium Polyphosphates Potassium Kurrol s Salt... 

Addition of active nuclei to a monomer solution or melt can shorten the induction period, enable quicker crystallization and avoid amorphous products. These nuclei may be of the same polymer as in polyformaldehyde or Kurrol s salt nucleation or they may be different. The effect of nucleation by monomer crystals was shown in the -aminocaproic acid pol5unerization (18) where an overwhelming amount of the gaseous monomer pol5mierized on the monomer crystals rather than on the enormously larger wall area. 

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