The thermodynamic properties of polyethylene, polydeuterioethylene, po
lypropylene, polybutene-1, polypentene-1, poly-3-methylbutene-1, polyh
exene-1, polyisobutylene, poly-4-methylpentene-1, polydecene-1 and the
thermodynamic parameters of their formation reactions over the range
from 0 to 600 K are discussed. Recommended values of the thermodynamic
variables are listed. The regularities of a change in the thermodynam
ic properties of polyolefins and in the parameters of their formation
reactions depending on the composition and srtructure of monomers and
polymers, their physical states and temperature at standard pressure a
re established.