Dynamic mechanical properties of poly-n-docosyl methacrylate☆

Add time:08/15/2019    Source:sciencedirect.com

The real (J′) and imaginary (J″) components of the complex compliance have been measured between 24 and 100 cycles/sec. at 59.0°C. and 65.2°C. for poly-n-docosyl methacrylate. The results, reduced to 62°C., provide the relaxation and retardation spectra over a short region which encompasses the maximum of the latter. The logarithm of the monomeric friction coefficient (units dyne-sec./cm.) is estimated to be −7.2. The maximum in the retardation spectrum for the butyl, hexyl, octyl, and docosyl methacrylate polymers is inversely proportional to the 3.4 power of the polymer density expressed in monomoles per cubic centimeter. The same relation is followed, with essentially the same proportionality constant, for solutions of poly-n-butyl methacrylate in diethyl phthalate. It is concluded that the number of strands per cubic centimeter in the entanglement network of a methacrylate polymer depends only on the concentration of chain backbones regardless of whether they are diluted by solvent molecules or by side groups.

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