Synthesis and Characterization of Poly (3,5-Dimethylphenylacrylate) in Toluene at 40°C by Two-Angle Light-Scattering and Differential Pressure Viscometry
Nasrollah Hamidi

Abstract
3,5-dimethylphenyl acrylate (35DMPA) was synthesized and chartered by GC-MS, NMR and density measurements. Poly(3,5-dimethylphenyl acrylate) (35PDMPA) was synthesized by radical polymerization of 35DMPA, fractionated to eleven samples of narrow molecular mass and chartered by NMR, and onlinetwo-angle (7° and 90°) light-scattering, and viscometry measurements with a size exclusion chromatographer. To characterize each sample, various volumes(15 µL to 150 µL with an interval of 20 µL)of dilute solutions (1-2 g/L) were injected to the SEC by autosamplerfrom a 200 µL loop. The values ofdn/dc, Mw, Mn, Mz, I, intrinsic viscosity, hydrodynamic radius, gyration radius, Kuhn-Mark-Houwink-Sakurada a and K-M-H-S Ka of each trailwas estimated byOmnisec 4.2 program. Graphs of the above characteristic parameters of eachtrial against the amount of polymer injected showed that these values are slightly depending on the volume of polymer solution injected. The dimensions of 35PDMPA chains are scaled to their molar massas Rh = 0.01289Mw0.5547.Double logarithmic relation of averages of Mw and [?] shows the slope a = 0.650, and intercept Ka =0.0129. The value of s = 2.47 to 3.15 obtained from intercepts of Stockmayer-Fixman plot.It has been related to the chemical structure of the 35PDMPA and shear rate of viscosity detector

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