Diluted Solution Properties of Poly (3,5-Dimethylphenylacrylate) in Toluene at 25°C and 30°C
Nasrollah Hamidi, Leanna Sealey, Bashir Hamidi

Abstract
Poly(3,5-dimethylphenylacrylate) (35PDMPA) was synthetized by radical polymerization under nitrogen atmosphere. It was divided to eleven fractions of lower polydispersity samples by precipitation fractionation method in toluene and hexanes. The structure of polymer was confirmed by H-and 13C-NMR spectroscopy. The molecular mass and polydispersity of samples were determined by Viscotek GPC-Max-triple arrowed detector system in tetrahydrofuran at 30°C. The viscosities of the samples in toluene were measured by capillary micro-viscometer in a Cannon thermostated water bath at 25° and 30° C. Value of intrinsic viscosity was estimated by the common intercept of Huggins and Kraemer’s methods. Two parameter models of Kuhn-Mark-Houwink-Sakurada relationship and Stockmayer-Fixman semi-empirical equation were used to determine the unperturbed dimensions of the polymer in solution. The results showed that increasing 5°C temperature improved quality of solvent but did not have any effects on the unperturbed dimensions, characteristic ratio, and rigidity parameter of the polymer. The rigidity parameter of 35PDMPA find to be larger than poly(methylacrylate) but smaller than poly(3,5-dimethylphenylmethacrylate) under same conditions of temperature and solvent.

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