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Image from page 357 of "The Bell System technical journal" (1922)

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説明Identifier: bell00systemvol31techniamerrichTitle: The Bell System technical journalYear: 1922 (1920s)Authors: American Telephone and Telegraph CompanySubjects: Telecommunication Electric engineering Communication Electronics Science TechnologyPublisher: [Short Hills, N.J., etc., American Telephone and Telegraph Co.]Contributing Library: Prelinger LibraryDigitizing Sponsor: Internet ArchiveView Book Page: Book ViewerAbout This Book: Catalog EntryView All Images: All Images From BookClick here to view book online to see this illustration in context in a browseable online version of this book.Text Appearing Before Image:\ k \ k \ ^ --. ^ ^^-> -^^ 0.250 0.500 0.750 1.000 CONCENTRATION IN GRAMS PER 100 ML. OF SOLUTION Fig. 21—Inherent viscositv of ])olvisol)ut vlenc (.1/^ = 3.87 X lO) in cyclo-hexane at 25°C. 346 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1952 3.500 50°C ^ 35°C • — - ( J ._-- 25°C ^ 1.500 ;=—— 0.250 0.500 0.750 CONCENTRATION IN GRAMS PER 100 ML. OF SOLUTION Fig. 22—Inherent viscosity of polyisobutylene (Af, = 3.87 X 10) in benzene,at various temperatures. more flexible compositions are often produced with low compatibilityplasticizers—indeed, sometimes with those on the verge of phase sepa-ration than with those with highly favorable heats of solution. Thiswould mean that the bad solvents would compress the chains so thatthey would be more easily strained than if they were in a free chamor even extended configuration. If single chain, visco-elastic stiffnessesare acting this way, the dynamic mb would then actually decline as heatof mixing become more positive. 2 1200Text Appearing After Image:Fig. 23-20 kc. 0.125 0.250 0.375 0.500 0.625 0.750 0.875 1.000 CONCENTRATION IN GRAMS PER 100 ML OF SOLUTION -Rigidity of polyisobutylenes in cyclohe.xane and benzene at 25°C and INTERACTION OF POLYMERS AND MECHANICAL WAVES 347 This seems to take place, as indicated by the lower compared to theupper curve on Fig. 23. Here, the /xs of the usual modified Ma.wvellmodel, at 20 kc, is plotted against c for the polyisobutylene of M, =3.9 X 10 . Also, the middle curve shows hb for a polymer of about atiiird of this molecular weight; while there is a small reduction in hbwith il/, in this range, it is much less than the reduction caused bytightening up the polymer coil. Tiie M« Nalues per average molecule, [fa], fall from 18 X 10~ dynecm in cyclohexane to 7 X 10 in benzene. (Of course, [Jb] for the inter-mediate molecular weight polymer in cyclohexane is only 5 X 10~ be-cause so many more molecules are present in solution.) The temperature dependence of /xb ^ilso becomes nearly zero at leasNote About ImagesPlease note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
撮影日1922-01-01 00:00:00
撮影者Internet Archive Book Images
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