Stress development during drying of calcium carbonate suspensions
containing carboxymethylcellulose and latex particlesVise andre og tillknytning
2004 (engelsk)Inngår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 272, s. 1-9Artikkel i tidsskrift (Fagfellevurdert)
Abstract [en]
Stress development during drying of coatings produced from aqueous dispersions of calcium carbonate particles in the presence and absence of organic binders was studied using a controlled-environment stress apparatus that simultaneously monitored drying stress, weight loss, and relative humidity. Specifically, the influence of two organic binders on drying stress evolution was investigated: (1) carboxymethylcellulose. a water-soluble viscosifying aid, and (2) a styrene-butadiene latex emulsion of varying glass transition temperature. The stress histories exhibited three distinct regions. First, a period of stress rise was observed, which reflected the capillary tension exerted by the liquid on the particle network. Second, a maximum stress was observed. Third, it was followed by a period of either stress decay or rise depending on the organic species present. Significant differences in stress histories were observed between coatings containing soluble and nonsoluble binders. Maximum drying stresses (sigma(max)) of 0.2-0.5 MPa were observed for coatings produced from pure calcium carbonate or calcium carbonate-latex suspensions. whereas coatings with carboxymethylcellulose exhibited substantially higher sigma(max) values of 1-2 MPa. Upon drying, these coatings were quite hygroscopic, such that cyclic variations in relative humidity induced large cyclic changes in residual stress.
Author Keywords:
sted, utgiver, år, opplag, sider
2004. Vol. 272, s. 1-9
Emneord [en]
Calcium carbonate, PCC, CMC, carboxy methylcellulose, latex, drying, paper coating, stress evolution
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-26680OAI: oai:DiVA.org:ri-26680DiVA, id: diva2:1053683
Merknad
A1604
2016-12-082016-12-082020-12-01bibliografisk kontrollert