Mechanical Properties of Substances of High Molecular Weight. V. Rigidities of Polyisobutylene Solutions in Various Solvents

Abstract

Vol. 71 022 isolated by filtering, washing with water and then acetone, and drying, was shown to be 2-amino-4-hydroxypteridine-6-carboxylic acid (III) by comparison of the ultraviolet absorption curve with that of an authentic sample.8 9,10-Dimethylpteroic Acid (IV).-This was prepared similarly to V above, except that ^-methylaminobenzoic acid8 was used (see Tabic 1 for ultraviolet absorption and biological data).

Studies of the Cross-Linking Process in Gelatin Gels.

“…Rigidity was determined from the velocity of propagation of transverse waves as described previously (1,8,10). The "wave rigidity", G, is given by V~p, where V is the velocity of propagation and p the density of the gel; since the damping is small, it differs only slightly" from (?…”

Shear Wave Propagation in a Birefringent Viscoelastic Medium

“…8 Further details of the effects of finite dimensions of the generating plane and fluid filled tanks used in the experiment were considered by carried out similar measurements on polymer solutions using a photomultiplier for detection of the optical effect.…”

Natural and Synthetic Rubbers

“…Ashworth and Ferry (16) determined the rigidity of solutions of polyisobutylene from studying the propagation of transverse waves in several solvents as a function of frequency, temperature, and concentration.…”