Shear and extensional rheology of polyacrylonitrile solution: effect of ultrahigh molecular weight polyacrylonitrile

被引：32

作者：

Tan, Lianjiang ^{[1
]}

Pan, Jinping ^{[2
]}

Wan, Ajun ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China

[2] Jiaxing Special Equipment Inspect Inst, Jiaxing 314001, Peoples R China

来源：

COLLOID AND POLYMER SCIENCE | 2012年 / 290卷 / 04期

基金：

中国博士后科学基金;

关键词：

Polyacrylonitrile solution; Ultrahigh molecular weight polyacrylonitrile; Shear rheology; Extensional rheology; CAPILLARY BREAKUP; POLYMER-SOLUTIONS; BEHAVIOR; FIBER; JET; STRETCH;

D O I：

10.1007/s00396-011-2546-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of ultrahigh molecular weight polyacrylonitrile (UHMWPAN) on the shear and extensional rheological behavior of PAN solutions were studied. The PAN solutions were prepared by dissolving medium molecular weight polyacrylonitrile in dilute UHMWPAN/dimethyl sulfoxide solutions. The results of shear rheological measurements indicated that the existence of UHMWPAN reduced the shear-thinning but increased the characteristic relaxation time and the elasticity of PAN solutions. Moreover, the PAN solutions containing UHMWPAN exhibited much more evident strain-hardening behavior than the solution without UHMWPAN. It was found from the results of extensional rheological measurements that the strain hardening and elasticity of PAN solutions increased greatly with the increase of molecular weight or content of UHMWPAN in the solutions. PAN solutions containing a small amount of UHMWPAN have better drawability and favor the increase of jet stretch ratio in dry-jet wet spinning of PAN precursor fibers.

引用

页码：289 / 295

页数：7

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