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Although phenol itself is used in the largest volume, various substituted phenols such as cresol (o-, m-, p-), p-butylphenol, resorcinol, and bisphenol A are used for specialty applications. Some use is also made of aldehydes other than formaldehyde acetaldehyde, glyoxal, 2-furaldehyde. The exact composition and molecular weight of the resole depend on the formaldehyde to phenol ratio, pH, temperature and other reaction conditions [Maciel et al., 1984; Werstler, 1986]. For example, higher formaldehyde compositions will yield resoles containing more of the mononuclear compounds. The resole prepolymer may be either a solid or liquid polymer and soluble or insoluble in water depending on composition and molecular weight. Molecular weights are in the range 500 5000; most are below 2000. The resoles are usually neutralized or made slightly acidic. The pH of the prepolymer together with its composition determine whether it will be slow curing or highly reactive. Crosslinking (curing) is carried out by heating at temperatures up to 180 C. The crosslinking process involves the same chemical reactions as for synthesizing the prepolymer the formation of methylene and ether bridges between benzene rings to yield a network structure of type XXIV. The relative

importance of methylene and ether bridges is dependent on temperature [Lenz, 1967]. Higher curing temperatures favor the formation of methylene bridges but not to the exclusion of ether bridges.

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prices, the English were determined and were able, with the aid of American credits and tight controls, to maintain the exchange rate of the pound sterling reasonably close to its gold parity Immediately after World War I, the course of the English economy was similar to that of the United States economy: a short, sharp boom in 1919 1920 and a sharper depression in 1920 1921, during which English unemployment rose to 10% The subsequent recovery in England, however, was not so rapid as that of the United States Foreign markets had been lost and exports were down to 50% of their prewar total (532) World-wide protective tariffs hindered British trade The English government struggled throughout the 1920 s to bring back the pound sterling to prewar parity and to hold it there This made the recovery of foreign markets difficult Interest rates were kept near high wartime levels.

The polymerization and crosslinking of phenol formaldehyde is a highly useful industrial process. However, the reactions that take place are quite dif cult to handle in a quantitative manner for a number of reasons. The assumption of equal reactivity of all functional groups in a monomer, independent of the other functional groups in the molecule and of whether the others are reacted, is dubious in this polymerization. Consider, for example, the routes by which trimethylolphenol (XXIb) can be produced in this system:

k2

Step-by-Step Bending Choosing a Cool Control Layout Case Considerations Marking the Board Drilling Holes Painting Control Mounting Soldering Testing Reassembly Musicality 319 319 321 321 321 321 321 321 322 323 323.

The crash of the American stock market in 1929 brought large declines on the London Exchange and started a wave of credit liquidation throughout the world American capital, which had financed an important part of world trade in the 1920 s, was no longer available Commodity prices in England declined 24% from 1929 through 1931 Liquidation and deep depression led many countries to abandon their recently restored gold standards, and this put pressure on the London money market The insolvency of the Austrian Creditanstalt in 1931 led to a financial crisis throughout Europe In September 1931, England abandoned the gold standard and set the pound to fluctuate with supply and demand It declined from $486 to $349, or almost 30%.

2-173

TABLE 2-10 Reaction of Phenol with Formaldehyde Catalyzed by Basea; b Reaction k1 0 k1 k2 0 k2 00 k2 k3 0 k3

Rate Constant 104 (L mol 1 s 1) 14.63 7.81 13.50 10.21 13.45 21.34 8.43

By the end of 1932, thirty-five countries had left the gold standard, and only the United States, France, Switzerland, the Netherlands, and Belgium remained to form the gold block During the next few years devaluation became general The United States devalued the dollar in 1933 1934, and the pound rose to $5 Immediately after England abandoned the gold standard, English monetary policy was reversed Interest rates were quickly pushed down, and every effort was made to encourage production and consumption The risk of inflation seemed remote The economic effects of these new policies, however, were obscured by a rash of small wars and political crises that upset ordinary peacetime economies.

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