Liquid densities, viscosities, orthobaric heat capacities, surface tensions, thermal conductivities, and saturated vapor pressures were measured for samples of mole fraction purity of 99.98 % HMCTS, OMCTS, and DMCPS over wide temperature ranges, by using Anton Paar densimeter, Hoeppler viscosimeter, Perkin-Elmer DSC 1B, modified bubble method, "hot wire" technique, and comparative ebulliometry, respectively. The experimental data were correlated and deviations or, for vapor pressure data, overall measures of data reproducibility are given.

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SUMMARY:The terminal and penultimate model reactivity ratios in the free-radical copolymerization of styrene and methyl methacrylate in bulk at 40 "C were calculated by means of the simplex and scanning methods. Calculations showed that for the terminal model rl and r2 vary in comparatively narrow ranges of 0.548 -0.552 and 0.480-0.483, respectively. For the penultimate model, the most accurate reactivity ratios calculated by the simplex method, which were rI1 = 0.727, r22 = 0.490, r2, = 2.890, r12 = 4.583, are surrounded with sets of reactivity ratio values of equal accuracy. The ranges of variation were found to be 0.711 -0.746, 0.487-0.492, 2.810-2.970 and 4.213-5.049, respectively. Numerical values of the penultimate r-parameters calculated with the simplex method depend, due to the structure of the multidimensional space (rT1, r22, r2,, rI2, CT), on the initial guess for the r-parameters. Use of the covariance matrix for the estimation of the indetermination ranges is discussed.

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