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Fractionation of Polystyrene by Column Elution Method

Lj. Lovrić ; INA-Research and Development Institute, Zagreb, Croatia, Yugoslavia
F. Flajšman ; INA-Research and Development Institute, Zagreb, Croatia, Yugoslavia

Sažetak

Polystyrene of commercial type from the firm Industrija (OKI), Zagreb, has been fractionated by the
column elution method with cyclohexane as a single solvent and
with successive increase of temperature. Glass wool was applied
as support in the column. In the experiments the following
factors were varied: the height of support in the column, the
rate of elution and the polymer concentration. The effects on
the efficiency of fractionation were observed. On the basis of
fractionation results graphs were constructed by plotting the
reciprocals of the critical elution temperatures 1/Tc, observed
for the polymer fractions vs. x-'I•, where x is the number of
segments per polymer chain. The thermodynamic parameters were
calculated from these plots using the slopes and intercepts. The
critical elution temperature depends on molecular weight linearly
in the manner predicted by theory.

Ključne riječi

Hrčak ID:

207924

URI

https://hrcak.srce.hr/207924

Datum izdavanja:

1.2.1970.

Posjeta: 687 *