An expression for the amount of chain transfer occurring in a copolymerization carried out in solvent media can be derived in a manner similar to the composition‐kinetic treatment for tripolymer formation. As a result, the relative reactivity of the chain‐transfer solvent can be determined.
Commercially available electrically heated vacuum ovens which provide for a working temperature above one hundred and fifty degrees centigrade are not sold. In addition, stock equipment is expensive. An electrically heated tube furnace which provides for small-scale vacuum drying at temperatures including three hundred degrees centigrade is herein described. The parts are constructed of standard pipe and fittings, and heat is provided by standard electric space heaters. The details of construction provide for the maintenance of a vacuum of a fraction of a millimeter and the oven has been shown to hold the reduced pressure practically undiminished for periods of twelve hours without pumping. Time-temperature heating curves under different power consumption are given. Modifications in wiring to economize in power consumption are described. This apparatus can be manufactured at a fraction of the investment in stock equipment of more limited range.
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