. The Bell System technical journal . Fig. 8—Dual reflecting block assembly for measuring high frequency shearimpedances of liquids. vents with concentrations ranging from zero per cent to 10 per is a polymer molecule having the chemical formula CH3 H C- C- CH3 H Non-planar zigzag segments can be expected in the liquid state. Fig. 10shows measured curves for 20 kc of the resistance and reactance forsolutions of viscosity average molecular weight of 3,930,000 in cyclo-hexane. Four values of concentration were used and two temperatureswere measured. For pure cyclohexane, th
. The Bell System technical journal . Fig. 8—Dual reflecting block assembly for measuring high frequency shearimpedances of liquids. vents with concentrations ranging from zero per cent to 10 per is a polymer molecule having the chemical formula CH3 H C- C- CH3 H Non-planar zigzag segments can be expected in the liquid state. Fig. 10shows measured curves for 20 kc of the resistance and reactance forsolutions of viscosity average molecular weight of 3,930,000 in cyclo-hexane. Four values of concentration were used and two temperatureswere measured. For pure cyclohexane, the resistance and reactance 136 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952. 0 I 23456789 RATIO OF FREQUENCY TO RELAXATION FREQUENCY Fig. 9—Resistance and reactance components of a solution having a singlerelaxation frequency and a solution viscosity 30 times the solvent viscosity. S40 <20 -^^ ^^ J R^ ^* J^ ^^ t>^ f X -o— & -Cr — ^ X ^ ^ °C 50°C PER CC OF Fig. 10—Shear resistance and reactance components of a solution of polyiso-butylene (molecular weight of 3,930,000) in cjclohexane plotted as a function ofgrams per cc of solution. MECHANICAL PROPKHTIES OF POLYMERS 137 components are equal but as llu> pcicontage of polyisobutylene is in-creased, the resistance iucreas(\s more rapidly tluin the reactance. By solving equation (9) for 77,1 , rj/j and m/j in terms of R antl A measuredat one fre(|uency and 77,1 + >?/; the solntion viscosity, we find dip Va fJ-B = C0p( + TJb) — 2RX {R~ — X) wriB 2RX Vb = (va + Vb) — Va (10) cop( + Vb) Applying t
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
