Precursor technology

As explained the early work with SAP remains commercially sensitive and only a generalized account of this work can be given. 

With a fixed ITA content raising the MA content increases the temperature of the exotherm peak, whilst A/f falls. The thermograms in air when MA is introduction into the system has the initial effect of permitting the oxidation reaction to proceed at a lower temperatures, albeit with smaller overall heat evolution, but at greater additions the reaction is retarded and the heat evolution becomes even less. 

The effect of increasing the ITA content whilst keeping the MA content constant noticeably reduces the peak temperatures and value of A// as the ITA content increases. 

It is of interest to note that extrapolations of the density/time plots intersect at zero time at a density of about 1.29 gcm . This could represent the density of the material produced when all the nitrile groups, which are capable of ring closure under moderate heating conditions, have so reacted and, if independent of the oxidation temperature, would extrapolate as shown, at zero time. Density measurements provide a rapid and simple way of following the progress of the oxidation reaction. 

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K. Mbnzel, ia. C. Bauemfeiud, ed.. Carotenoids as Colorants and Vitamin A Precursors, Technological and Nutritional Applications, Academic Press, Inc., New York, 1981, pp. 781-813. 

Narula CK (1995) Ceramic Precursor Technology and Its Applications. Marcel Dekker, New York... 

A. The LCD watch was the precursor technology to active matrix LCD screens. 

Figure 4.4 shows typical wet-spun precursor technology using continuous solution polymerization and wet spinning. 

Figure 4.4 Wet spun precursor technology continuous solution polymerization/wet spinning. Source reprinted from East G, McIntyre J, Patel G, The dry-jet wet-spinning of an acrylic liber yam, J Text Inst, 75, 196-200, 1984.

Narula, C.K. (1995). Ceramic Precursor Technology and its Applications. New York Marcel Dekker. 

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