UNUSUAL COMPLEXATION BEHAVIOR OF POLY(ACRYLIC ACID) INDUCED BY SHEAR

被引：16

作者：

KIM, OK ^{[1
]}

CHOI, LS ^{[1
]}

LONG, T ^{[1
]}

MCGRATH, K ^{[1
]}

ARMISTEAD, JP ^{[1
]}

YOON, TH ^{[1
]}

机构：

[1] GEOCENTERS INC,FT WASHINGTON,MD 20744

来源：

MACROMOLECULES | 1993年 / 26卷 / 02期

关键词：

D O I：

10.1021/ma00054a018

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(acrylic acid) (PAA) in dilute solution undergoes a stable interchain association under high shear flow. This is reflected in a sharp decrease in drag reduction (DR). For this flow-induced deformation to occur the PAA must be of ultrahigh molecular weight (greater-than-or-equal-to 5 X 10(6)), in low concentration (<5 X 10(-4) M), and in a pH range of 6-8. Addition of a minute amount of salt to the shearing PAA solution induced a full recovery of the DR, suggesting a disruption of interchain association. Fluorescence emission of auramine O (AuO) that appears only upon shearing suggests that the shearing has developed a rigidity along the PAA chains. This is probably the direct result of supermolecular chain complexation by interchain H-bonding. The formation and stability of the supermolecular H-bonding is characterized by AuO fluorescence, FTIR, and Na-23 NMR spectra as well as DR.

引用

页码：379 / 384

页数：6

共 27 条

[1] FLOW OF DILUTE POLYMER-SOLUTIONS - CHAIN CONFORMATIONS AND DEGRADATION OF DRAG REDUCERS [J].