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deduced (36). as The number-average degree of polymerization P can be expressed 1 p = ------------------ , 1-1)[cyclo: s8] . and the total concentration of s8 units in monomers and polymers 'is 2 ~H0 =32.8 Kcal/mole; DS0 =23 cal/deg. mole ~H3 =3.1 Kcal/mole ; DS3 = 4.6 cal/deg. mole. .[s8]=[cyclo-s8]+K[cyclos8]/(1-JS [cyclos8]) .The thermal constants for these two processes have been given as: ·~· -10- . -· III. Liquid Sulphur The physical properties of liquid sulphur are so unusual that they are demonstrations familiar to every high school student: At the melting p~int sulphur forms a light Yellow lmv viscosity liquid. On heating, the liquid darkens and the viscosity increases and goes through a maximum at 159°C. At this temperature sulphur gets so viscous that it cannot be poured from containers. Together with this viscosity, the specific heat, the density, the electric conductivity, the velocity of sound, and almost all physical properties show a discontinuity around 160°C (34). This is caused by the equilibrium polymerization of sulphur which is in_itiated by the ring scissions .:(35) Cyclo-s8 ~ catena-s8; [catena s8}=K. [cyclo..s8] .·and propagated by the condensation reaction: n-1 [(catena-s8)n] = K [cyclo s8] + (K3 [cyclo-s8]) . Quantitative descriptions for the processes have during recent years been ·~ ''· ''· . ,.·· : '·. liW': ·,. ;.PDF Image | ELEMENTAL SULPHUR
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