Effect of microgel content on the shear and extensional rheology of polyacrylonitrile solution

被引：12

作者：

Liu, Xiaofang ^{[1
,2
]}

Zhu, Caizhen ^{[1
]}

Dong, Haixia ^{[1
]}

Wang, Baoming ^{[3
]}

Liu, Ruigang ^{[1
]}

Zhao, Ning ^{[1
]}

Li, Shuxiang ^{[3
]}

Xu, Jian ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst Chem, Lab Polymer Phys & Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Weihai Tuozhan Fiber Co Ltd, Weihai 264202, Peoples R China

来源：

COLLOID AND POLYMER SCIENCE | 2015年 / 293卷 / 02期

关键词：

Extensional rheology; Spinnability; Microgel; Polyacrylonitrile; Shear rheology; CARBON-FIBER; POLY(ACRYLONITRILE-CO-ITACONIC ACID); OXIDATIVE STABILIZATION; CAPILLARY BREAKUP; PAN; TEMPERATURE; BEHAVIOR; MICROSTRUCTURE; PRECURSOR; SPINNABILITY;

D O I：

10.1007/s00396-014-3419-1

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：

Crosslinked polyacrylonitrile (cPAN) particles with uniform size were synthesized through precipitation polymerization. The as-formed cPAN nanoparticles were dispersed in polyacrylonitrile (PAN) solutions to form microgels with various contents, which were used as model to study the influence of the microgels on the shear and extensional rheology of PAN solutions. Flow curves of steady shear viscosity displayed shear thinning and followed time-temperature superposition principle. The dependency of activation energy on the content of cPAN microgels indicated that introduction of microgels weakened the temperature sensitivity of PAN solutions. For extensional rheology study, we utilized the capillary thinning rheometry to characterize the elongation relaxation time and apparent extensional viscosity. Study of filament thinning dynamics with a series of system strains confirmed that the higher content of cPAN microgels the lower extensional strength and worse spinnability of the PAN solution.

引用

页码：587 / 596

页数：10

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