Abstract
AbstractTemperature dependence of light scattering and viscosity data was studied on three polymers: poly(4‐bromophenylethylene) [poly‐p‐bromostyrene], poly[1‐(methoxycarbonyl)‐1‐methylethylene] [poly(methyl methacrylate)] and poly(2‐pyridylethylene) [poly(vinylpyridine)] in dilute solution. It was observed that over a narrow range of temperature sharp changes of second virial coefficients, unperturbed dimensions and scattered intensities do occur. This phenomenon can be accounted for by assuming that in the chosen solvents the conformation of the chain undergoes changes, increasing temperature causing a higher flexibility.These conformational changes disappear entirely on addition of minute amounts of well solvating, polar solvents, which confirms that the observed transition is only concerned with short range interactions along the chain.
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