Achieving a high molecular weight was a major problem in the development of the nylon polymerization process. Why was this so? Suggest a method to overcome the problem
What will be an ideal response?
Nylon is made through the condensation polymerization process. Water is a byproduct of the polymerization. After a certain point in the process, the reaction begins to slow because of the abundance of water. Continued reaction becomes increasingly more difficult and chain growth is halted. This gives shorter chain length and lower molecular weight. One method to overcome the overabundance of water in the reaction vessel is to apply a vacuum to the polymerization chamber. By removing the water from the reaction, the molecular weight can continue to grow.
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?Name an instrument that would be used to measure end play of a shaft.
What will be an ideal response?
Obtain the frequency response of the circuit in Fig. 14.40 (see Practice Problem 14.10). Take R? = R? = 100 ?, L = 2 mH. Use 1 < f < 100,000 Hz.
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The ____________________ was standardized in 1857 and is used mainly in the United States for the diameters of round, solid, nonferrous electrical wire.
Fill in the blank(s) with the appropriate word(s).
In the number 3,567,890, the digit 9 is in the hundreds place.
Answer the following statement true (T) or false (F)