Apparatus for microscopic study of polymerization catalyst

Abstract

10 min., the addition of methanol produced a soft, translucent precipitate which on further washing with methanol gave an opaque and somewhat harder material. This was dried in a vacuum oven to give a Soy0 yield of a white solid soluble in water as well as in methylene chloride. In water the polymer had an inherent viscosity (In qrel/c at 0.5% concentration) a t 30°C. of 0.33. In methylene chloride the inherent viscosity was 0.69.The polymer became molten on a hot bar at around 280°C., and showed excellent thermal and oxidative stability up to this temperature. Films which were drawable could bc cast from methylene chloride solution.Trcatrnent of p-dioxene with 0.25y0 azobisisobutyronitrile as a potential initiator a t 56OC. for 49 hr. gave no polymer. The monomer thus behaved as a typical vinyl ether, polymerizing readily by a cationic but by not a free radical mechanism.

Chemical Microscopy

“…The construction of microring dishes in which crystallization studies are carried out under the microscope is described by Monkman (113). Gamble (59) has designed a small reservoir with an observation chamber for making microscopical observations of reactants mixed under controlled conditions. The entire surfaces of cylindrical fibers are replicated by a rolling technique (111).…”