. The Bell System technical journal . ^e synthetic 20 30 40 50 60 70 STYRENE RESIDUES IN WEIGHT PER CENT Fig. 4.—Refraction as a function of styrene content for solutions in benzene of polymerscontaining known percentages of st\Tene. Through the use of this method it has been possible to control the styrenecontent of the copolymer to about ± weight percent styrene residues,which is amply close for all purposes. Figure 5 shows the apparatus em-ployed in this determination, the interferometer. More recently, it hasbeen possible to emj^loy a simpler procedure where a milling of the c
. The Bell System technical journal . ^e synthetic 20 30 40 50 60 70 STYRENE RESIDUES IN WEIGHT PER CENT Fig. 4.—Refraction as a function of styrene content for solutions in benzene of polymerscontaining known percentages of st\Tene. Through the use of this method it has been possible to control the styrenecontent of the copolymer to about ± weight percent styrene residues,which is amply close for all purposes. Figure 5 shows the apparatus em-ployed in this determination, the interferometer. More recently, it hasbeen possible to emj^loy a simpler procedure where a milling of the copolymeris introduced to remedy difiiculties early encountered in the determinationof the refractive index directly on the solid. Although not as precise asthe interferometer method, this method is shorter and as a consequenceis tlnding application in process control. It is safe to say that today, withthese methods, the control of the average composition of GR-S procuced inthis country is now entirely adequate for all purposes. SYNTHETIC RUBBER RESEARC
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
