THERMODYNAMICS OF ISOTACTIC POLYBUTENE-1 AND OF THE PROCESSES OF ITS FORMATION FROM BUTENE-1, CIS-BUTENE-2 AND TRANS-BUTENE-2, AND ETHYLENEIN THE 0-K-600-K RANGE

Specific heat C-p(0) of isotactic polybutene-1 in the 6 - 500 K range was studied calorimetrically. Temperatures and enthalpies of melting f or different crystalline forms of polybutene-1 were determined with gl ass transition parameters. Thermodynamic functions H-0(T) - H-0(0), S0 (T), and G0(T) - H-(0) were calculated in the range 0 - 600 K. Zero S0 (0) and configurational S-con(0) entropies of polybutene-1 in glassy s tate, as well as the differences between zero enthalpies in glassy and crystalline states H-g(0)(0) - H-c(0)(0) were estimated. Using these results and data for butene-1, cis- and trans-butene-2, and ethylene w e calculated thermodynamic functions for the following processes: poly merization of butene-1, monomer-isomerization polymerization of cis- a nd tran-butene-2 to poly(butene-1), polymerization of ethylene to poly (butene-1), isomerization of cis- and trans-butene-2 to butene-1, and for dimerization of ethylene to butene-1, in the same range of tempera tures at normal pressure.