GINZBURG CRITERION FOR THE MEAN-FIELD TO 3-DIMENSIONAL ISING CROSSOVER IN POLYMER BLENDS

被引：27

作者：

SCHWAHN, D ^{[1
]}

SCHMACKERS, T ^{[1
]}

MORTENSEN, K ^{[1
]}

机构：

[1] RISO NATL LAB, DK-4000 ROSKILDE, DENMARK

来源：

PHYSICAL REVIEW E | 1995年 / 52卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.52.R1288

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Composition fluctuations within the mean-field and three-dimensional Ising range were measured in a homogeneous binary polymer blend by small angle neutron scattering as a function of temperature and pressure. The experimental data were analyzed in terms of the crossover function of Belyakov and Kiselev [Physica A 190, 75 (1992)]. It is shown that the reduced-crossover-temperature, the Ginzburg number Gi, decreases with pressure sensitively, in accordance with the prediction of Belyakov and Kiselev. On the other hand, de Gennes' crossover criterion for polymer blends predicts an increase of Gi with pressure which contradicts our results.

引用

收藏

页码：R1288 / R1291

页数：4

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