Low-density polyethylene in mixtures of hexane and benzene derivates |
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Authors: | Alena Randová Lidmila Bartovská Štěpán Hovorka Pavel Izák Magda Poloncarzová Tomáš Bartovský |
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Institution: | (1) Kocaeli University, Kocaeli, Turkey;(2) Sem Ltd, Istanbul, Turkey;(3) Istanbul Technical University, Istanbul, Turkey; |
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Abstract: | Preferential sorption, equilibrium swelling degree, and volume of the swollen membrane in systems low-density polyethylene
+ hexane + aromatic compound (benzene, methylbenzene, or ethylbenzene) were studied using gravimetric and dilatometric methods
at the temperature of 25 °C. Aromatic compounds are preferentially sorbed in low-density polyethylene compared to hexane.
Experimental volume changes of the membrane were found to be noticeably different from those calculated on the basis of mass
sorption data under the assumption of additivity. This difference points to the existence of the interactions between the
polymer and the surrounding liquid mixture. The volume swelling degree curves are close to each other in the whole concentration
range of the binary liquid mixture (hexane + aromatics) suggesting that the attractive forces between the polymer chains are
the deciding factor limiting the volume expansion of the membrane in all three systems to the same extent. |
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