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- W2034963480 abstract "The thermal polymerization of single crystals of pTS [bis(p-toluene sulphonate of 2,4-hexadiyne 1,6-diol] has been studied by DSC. The total heat of polymerization is 37.1 ± 0.4 kcal/mole at 323 K. The specific heats of monomer and polymer pTS have been measured from 320 to 360 and 385 K respectively and used to calculate heats of polymerization at other temperatures in that range. Isothermal polymerization has been studied from 333 to 363 K. The activation energies are different in the autocatalytic region (22.5 kcal/mole) and at the beginning of the induction period (25.5 kcal/mole), so that the ratio of the corresponding rate constants decreases from over 300 at 333 K to 200 at 360 K. The pre-exponential factors, or activation entropies, in the two regimes are equal. The melting of pTS has also been studied by DSC. There are always two endotherms, with maxima at = 92 and 94°C, in the pure monomer. The 92°C endotherm is more important in microcrystals obtained by precipitation or grinding and decreases in intensity without shifting in T, on annealing; this suggests the existence of a second, metastable, phase, less thermally reactive than the normal one." @default.
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- W2034963480 date "1984-04-01" @default.
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- W2034963480 title "Studies on a polymerizable crystal. II. Microcalorimetric study of polymerization and polymorphism of pTS" @default.
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- W2034963480 doi "https://doi.org/10.1016/0301-0104(84)85274-x" @default.
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