| Popis: |
Pyrolysis-gas Chromatographic investigations have been carried out on five kinds of butadiene (BD) co-polymers with a Curie-point pyrolyzer. In the pyrolysates, the yield of vinylcyclohexene (VCH) formed from successive BD units in the co-polymer shows the different sequential structures of these co-polymers. Assuming that the probability of the BD unit in the center of each triad degrading to products other than BD and VCH is constant, the VCH/BD molar ratio, Q, is related to the run number, R, and the BD mole%, X, in the equation Q = [k1,(X — R/2)2 + k2R(X —R/2)]/[(1 — k1) (X —R/2)2 + (1 —k2) R(X - R/2) - R2/4]. The run. number of each co-polymer is then calculated by means of Q and X obtained from the pyrogram. |
