CONCENTRATION-DEPENDENT THERMODYNAMIC INTERACTION PARAMETERS FOR POLYMER-SOLUTIONS - QUICK AND RELIABLE DETERMINATION VIA NORMAL GAS-CHROMATOGRAPHY

被引:36
作者
PETRI, HM [1 ]
WOLF, BA [1 ]
机构
[1] JOHANNES GUTENBERG UNIV,INST PHYS CHEM,D-55099 MAINZ,GERMANY
关键词
D O I
10.1021/ma00088a010
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Equilibrium vapor pressures were determined by combining a head-space sampler with a gas chromatograph for the system cyclohexane/polystyrene in the temperature range from 35 to 65-degrees-C. From these measurements the Flory-Huggins interaction parameter chi, its variation with phi2, the volume fraction of the polymer, and its enthalpy part were calculated; chi(phi2) was represented by an analytical expression given by Koningsveld and Kleintjens and compared with different experimental findings reported in the literature. All measurements agree reasonably well at 35-degrees-C (in the vicinity of the THETA temperature of the system). Differences develop as T is raised; at 65-degrees-C chi and its concentration dependence are found to be less pronounced than reported. Under these conditions there also exists a discrepancy between the values calculated from chi(phi2) for vanishing polymer concentration and those directly measured. The reasons for that observation are discussed. The present work demonstrates that the new method yields quick and reliable information on chi(phi2;T).
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页码:2714 / 2718
页数:5
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