Effects of hydrophilic/hydrophobic surfaces on polymer‐complexation kinetics

Abstract

To establish hydrophilic/hydrophobic effects on polymer‐complexation kinetics, chitosan resins were prepared by radical copolymerization of methacryloyl‐modified chitosans with 2‐hydroxyethyl methacrylate and/or styrene monomers. The primary particles of the gelled copolymers in the suspensions were nicely solidified by basic coagulation bath to form globular beads. Degree of the hydrophilic/hydrophobic properties was controlled by the copolymerization ratio, and each ion‐adsorption kinetics was evaluated by batch method. The initial rate of adsorption in hydrophilic chitosans was higher than that in hydrophobic chitosans, which was attributed to less thickness of the boundary film. We quantitatively evaluated the rate‐determining steps by the initial‐rate analysis, in which the viscosity of the suspension contributes to the film‐diffusion kinetic resistance. The role of hydrophilic/hydrophobic properties of the resins is reasonably rationalized to the length of the boundary films by considering long‐range interactions between the ion and surface. Our results are robust evidence for the ion‐surface interactions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46493.

Modification of Polydiallyldimethylammonium Chloride with Sodium Polystyrenesulfonate Dramatically Changes the Resistance of Polymer-Based Coatings towards Wash-Off from Both Hydrophilic and Hydrophobic Surfaces

“…On glass surfaces, such an interaction is carried out mainly due to silanol groups [ 21 ]. Another aspect that affects the formation of a coating from aqueous solutions is the hydrophilicity/hydrophilicity of the treated substrate [ 22 ]. It is obvious that lipophilic surfaces prevent the distribution of an aqueous solution over their area.…”

Switching of optical‐resolution selectivity through the Onsager's reaction field: Chiral recognition of dl‐amino acids by hydrophilic/hydrophobic chitosans

“…As for the characterization of these resins, the results from IR, SEM, and XPS analyses were reported in detail in our previous work . Above all, copolymerization was well confirmed by XPS …”

“…The chiral adsorbents were prepared as per our previous work on ion‐exchange kinetics: Chitosan was modified by isocyanate ethyl methacrylate (IEM) to copolymerize with HEMA and styrene (Figure ), which have typical polar and nonpolar fragments, respectively. Permittivity was controlled by changing the hydrophilicity and hydrophobicity by way of the amount of HEMA or styrene that is copolymerized through the IEM‐crosslinked bridge, so that the resultant resins have hydrophilic/hydrophobic properties at the macroscopic level.…”

“…Permittivity was controlled by changing the hydrophilicity and hydrophobicity by way of the amount of HEMA or styrene that is copolymerized through the IEM‐crosslinked bridge, so that the resultant resins have hydrophilic/hydrophobic properties at the macroscopic level. As shown in Figure (a–c), we dealt with three types of resin beads made from normal chitosan: (1) pristine chitosan, as reference (“KOYO chitosan” with 86.8% deacetylation ratio and 4 × 10 3 kDa weight‐average molecular weight, soluble only in dilute acids) denoted by C in Figure (a); (2) hydrophilic chitosan (chitosan/HEMA 1:1 by weight) denoted by CH in Figure (b); and (3) hydrophobic chitosan (chitosan/styrene 1:1 wt %) denoted by CS in Figure (c) . As for the characterization of these resins, the results from IR, SEM, and XPS analyses were reported in detail in our previous work .…”

“…As shown in Figure (a–c), we dealt with three types of resin beads made from normal chitosan: (1) pristine chitosan, as reference (“KOYO chitosan” with 86.8% deacetylation ratio and 4 × 10 3 kDa weight‐average molecular weight, soluble only in dilute acids) denoted by C in Figure (a); (2) hydrophilic chitosan (chitosan/HEMA 1:1 by weight) denoted by CH in Figure (b); and (3) hydrophobic chitosan (chitosan/styrene 1:1 wt %) denoted by CS in Figure (c) . As for the characterization of these resins, the results from IR, SEM, and XPS analyses were reported in detail in our previous work . Above all, copolymerization was well confirmed by XPS …”