Rheological Studies of Microfibrillar Cellulose Water Dispersions

被引：248

作者：

Iotti, Marco ^{[1
]}

Gregersen, Oyvind Weiby ^{[1
]}

Moe, Storker ^{[1
]}

Lenes, Marianne ^{[2
]}

机构：

[1] NTNU, Dept Chem Engn, N-7491 Trondheim, Norway

[2] PFI, Paper & Fibre Res Inst, N-7491 Trondheim, Norway

来源：

JOURNAL OF POLYMERS AND THE ENVIRONMENT | 2011年 / 19卷 / 01期

关键词：

Microfibrillar cellulose; Rheology; Coating; Packaging; NANOFIBERS; SUSPENSIONS;

D O I：

10.1007/s10924-010-0248-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The rheological behaviour of microfibrillar cellulose (MFC) water dispersions has been investigated. For the first time a detailed study of shear dependent viscosity at low and high shear rate is presented. A peculiar time dependent behaviour measured in the area between 0 and 1000 s(-1) was identified. The study shows a hysteresis loop in the shear rate-viscosity relationship at low shear rate. Additional time dependent shear rate measurements were performed, and a hypothesis for a mechanism of interaction and formation of a fibrils network was suggested. Higher temperature caused lower viscosity values, and this difference was increased at higher shear rate values. Oscillatory measurements showed how the closeness of the fibrils helps network creations. Data obtained from high shear measurements showed that 1% MFC water dispersions had a dilatant behaviour at ultra high shear rates with values increasing from 120 to 300 Pa s in the area between 180,000 and 330,000 s(-1) .

引用

页码：137 / 145

页数：9

共 31 条

[1] Obtaining cellulose nanofibers with a uniform width of 15 nm from wood [J].