Question

Why does polester seem to be stationary

Answer 1

Sets of polyester condensates have been compared as stationary phases in gas-liquid chromatography by determination of their polarity constants both from the Rohrschneider probes at low temperature and usign a set of aromatic probes at high temperature. It was found that isomeric polyesters do not have the same polarities and, from the concept of methylene transfer between the diol and acid backbones of the polymers, a general conclusion is reached that transfer of methylene groups from the diol to the acid backbone increases the polarity of the phase. The lower (more polar) members of the series, however, displayed anomalous behaviour. An examination of poly(methyl methacrylate) as possible high-temperature polyester phase was carried out. This addition polymer displayed a lower polarity than its isomeric polycondensates and, although stable to a working temperature of 280°, the material proved unsatisfactory in performance—low column efficiencies were observed as a result of the high viscosity of the material.

Answer 2

Explanation:

Polaris, the North Star, appears stationary in the sky because it is positioned close to the line of Earth's axis projected into space. As such, it is the only bright star whose position relative to a rotating Earth does not change. All other stars appear to move opposite to the Earth's rotation beneath them

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