THERMODYNAMIC PROPERTIES OF 4-METHYLPENTE NE-1, POLY(4-METHYLPENTENE-1), AND THE POLYMERIZATION OF 4-METHYLPENTENE-1

Thermodynamic properties of 4-methylpentene-1 and poly(4-methylpentene -1) were studied in temperature range from 7 to 670 K and their thermo dynamic functions were calculated in the 0 - 600 K interval. The therm ochemical parameters were calculated for the formation of 4-methylpent ene-1 and poly(4-methylpentene-1) from simple substances at T = 298.15 K and p = 101.325 kPa. The polymer exhibits a mesomorphic state at T > T(m)0. The entropy diagrams of the monomer and polymer are analyzed. It is shown that the zero-temperature entropies of poly(4-methylpente ne-1) in the glassy and crystalline states coincide to within +/-2 J/( mol K) and equal zero within the same accuracy. Using the experimental values and the data available in the literature, the thermodynamic ch aracteristics DELTAH0, DELTAS0, and DELTAC0 for the polymerization of 4-methylpentene-1 and cis- and trans-methylpentene-2 were calculated, and the upper critical solution temperatures for these polymers were d etermined. The thermodynamic parameters were calculated for the synthe sis of 4-methylpentene-1 from propylene, and for the isomerization of cis- and trans-methylpentene-2 into 4-methylpentene-1.