THERMOGRAVITATIONAL THERMAL-DIFFUSION IN LIQUID POLYMER-SOLUTIONS

被引：28

作者：

ECENARRO, O ^{[1
]}

MADARIAGA, JA ^{[1
]}

NAVARRO, JL ^{[1
]}

SANTAMARIA, CM ^{[1
]}

CARRION, JA ^{[1
]}

SAVIRON, JM ^{[1
]}

机构：

[1] UNIV ZARAGOZA, FAC CIENCIAS, E-50010 ZARAGOZA, SPAIN

来源：

MACROMOLECULES | 1994年 / 27卷 / 18期

关键词：

D O I：

10.1021/ma00096a018

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We analyzed the steady state behavior of a thermogravitational column for a toluene-polystyrene system at different concentrations and at molecular weights of polystyrene in the 45 000-540 000 range. The results obtained indicate that steady state separation strongly increases with concentration and molecular I weight. From steady state separation measurements, the thermal diffusion coefficient of the mixtures considered was determined. It is shown that this quantity is in the dilute region, irrespective of molecular weight and concentration. The close agreement between our values and those reported in the literature obtained using different techniques indicates that closed columns can be used to accurately determine thermal diffusion properties of macromolecular solutions.

引用

页码：4968 / 4971

页数：4

共 19 条

[1] THERMOGRAVITATIONAL THERMAL DIFFUSION .V. TEMPERATURE DIFFERENCE EFFECTS . THERMAL DIFFUSION FACTORS FOR SYSTEM CARBON TETRACHLORIDE-CYCLOHEXANE AND CARBON TETRACHLORIDE-ETHYL ALCOHOL [J].