Adsorption of water‐soluble, nonionic polymers onto cellulosic fibers

Abstract

SynopsisThe adsorption of 12 different nonionic water-soluble polymers, methylcellulose (MC), hydroxypropylcellulose (HPC), polygalactomannan (PGM), polyglycidol (PGD), polyacrylamide (PAAm), methylolated polyacrylamide (MPAAm), polymethacrylamide (PMAAm), three differently hydrolyzed poly(viny1 acetate)s (PVAs), poly(viny1) methyl ether) (PVME), and poly(viny1 pyrrolidone) (PVP) onto bleached kraft pulp (BK), unbleached kraft pulp (UK), and a groundwood pulp (MP) has been investigated under aqueous conditions with attention to the functional groups in the polymers and the chemical character of the pulps. It was found that the adsorption was often selective toward one of the pulps. In order to gain some additional information on these interactions, some adsorption experiments were also performed on acetylated pulps. Some polymers (PGD, PAAm, MPAAm, and PVA 124) having both proton donating and accepting capability were not adsorbed onto any of the pulps. This was attributed to intramolecular hydrogen bonding in these polymers. Some polymers (PVA 224, PVME, and PVP) were strongly adsorbed onto UK but not at all onto BK. It was suggested that in these cases the adsorptive interaction was between phenolic and/or catecholic groups in the lignin on the UK and proton accepting sites on the polymers. However, for three polymers (MC, PGM, and PMAAm), a more general type of hydrogen bonding interaction was considered. For some polymers (HPC, PMAAm, and PVA 420) having hydrophobic groups, it was suggested that hydrophobic interactions were important for the adsorption.

Water redispersible cellulose nanofibrils adsorbed with carboxymethyl cellulose

“…The adsorption of anionic CMC onto slightly negatively charged CNFs is unfavorable due to charge-charge repulsion. The irreversible adsorption relies on the attachment of unsubstituted cellulose segments in CMC on cellulose chains exposed on the surface of CNFs by hydrogen bonding, similar to the adsorption of a nonionic polymer, methylcellulose, onto wood pulp (Ishimaru and Lindström 1984). As shown in Fig.…”

Dual Reactive Domain Model for Sorption of Aqueous Organics by Wood Fiber

“…[7] Here, the molar concentration of the ith species has been replaced by its mass concentration divided by its molecular weight M. Figure 8 shows the fit of the data using Eq. [7].…”

“…[7] Here, the molar concentration of the ith species has been replaced by its mass concentration divided by its molecular weight M. Figure 8 shows the fit of the data using Eq. [7]. Again, the measured αbC max s value of 34.5 ± 1.4 mL/g is in agreement with values measured previously for competitive and noncompetitive sorption.…”

“…Thus, understanding how various chemical species interact with fiber is important in controlling and optimizing the papermaking process. While there has been a considerable amount of research on the adsorption of polyelectrolytes to papermaking fiber (1)(2)(3)(4)(5), little has been pub-lished on neutral molecule and polymer sorption or the role of hydrophobes in chemical retention (6,7). In a previous publication, results were presented for the sorption to kraft papermaking fiber by chlorophenol species (8).…”

Studies on adsorptive interaction between natural fiber and coupling agents

“…The probability of participation of the amide group in forming hydrogen bonds with the cellulose portion of fiber is also assumed, besides little hydrophobic interaction between the methacryl groups and the lignocellulosics. The presence of the methyl 25 group decreases the coupling agent-water interaction, thereby increasing the adsorption properties. A probable scheme is proposed for fiber-coupling agent interaction (Fig.…”