Effect of cationic PVA characteristics on fiber and paper properties at saturation level of polymer adsorption

被引:31
|
作者
Fatehi, Pedram [1 ]
Xiao, Huining [1 ]
机构
[1] Univ New Brunswick, Limerick Pulp & Paper Ctr, Dept Chem Engn, Fredericton, NB E3B 5A3, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
CPVA; Paper properties; Dry strength additive; Polymer characteristics; Repulsion force; Hydrodynamic size; Cellulose fibers; MOLECULAR-WEIGHT; CHARGE-DENSITY; VINYL ALCOHOL; DRY STRENGTH; POLYELECTROLYTE ADSORPTION; QUATERNARY CHITOSAN; POLYACRYLAMIDES; PAPERMAKING;
D O I
10.1016/j.carbpol.2009.08.029
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The characteristics of dry strength additives affect their efficiency in improving fiber bonding in this. work, the influence the charge density and molecular weight, MW, of cationic poly (vinyl alcohol), CPVAs, in improving the strength of papers was investigated at equilibrium level of CPVA adsorption. In the case of CPVAs with the charge density of 0.75 meq/g, the small CPVAs (h(y) < 8 nm) did not alter the paper properties, though they adsorbed more than the large CPVAs. The large CPVAs (h(y) > 8 nm) improved the paper properties to some extent, but the hydrodynamic size of CPVAs did not affect their efficiency in improving the paper properties. Also, the low-charged (0.4 meq/g) high molecular weight (MW) CPVA improved the paper properties more than the high-charged high MW ones, even though the total charges introduced to fibers were less by applying low-charged CPVA than by applying high-charged ones. Similar trends were obtained by adsorbing various CPVAs on refined fibers. However, the properties of papers made from unmodified refined fibers were generally superior to those of papers made from CPVA-modified refined fibers, probably due to the coverage of fibrils on the fiber surface. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:423 / 428
页数:6
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