The Adsorption of Polystyrene-Poly(methyl methacrylate) Mixtures at a Solid-Liquid Interface<sup>1</sup>

Thies, Curt

doi:10.1021/j100884a005

Cited by 97 publications

(26 citation statements)

References 6 publications

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“…The catalyst, [ RhH (CO) (PPh,),] (0.14 g, 0.5% loading by weight) was then placed in the catalyst addition system, and the reactor was sealed. The solution was purged with carbon monoxide for 15 min, and then the reactor was brought to operating conditions ( 60°C, 400 psi with CO : H2 = 1 : 1). The catalyst was released from the catalyst addition system, and the ensuing reaction was monitored by the amount of gas consumed.…”

Section: Hydroformylation Of Sb Diblock Copolymermentioning

confidence: 99%

Adsorption of a functionalized polymer from dilute nonaqueous solutions by silica

Ayub¹,

Ling²

1990

J of Applied Polymer Sci

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SynopsisThe adsorption of a functionalized styrene-butadiene (SB ) diblock copolymer from toluene solutions at 25OC onto silica of varying particle sizes was studied using thermogravimetric analysis. The copolymer was chemically modified by hydroformylation, and the adsorbate concentration ranged from 0 to 2% by weight. The modified copolymer was adsorbed by the silica particles, but the unmodified copolymer was not. The plateau adsorption was found to increase with silica surface area, and the level of surface coverage ranged from 0.4 to 0.8 mg/m2.

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Section: Hydroformylation Of Sb Diblock Copolymermentioning

confidence: 99%

Adsorption of a functionalized polymer from dilute nonaqueous solutions by silica

Ayub¹,

Ling²

1990

J of Applied Polymer Sci

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“…(iii) These amounts are maximal for pH values close to the isoelectric point of the protein-coated surface (10,11). (iv) For synthetic homopolymers of the same chemical nature, the affinity for a surface increases with the molecular weight (12). (v) It has been shown experimentally that for homopolymers of the same nature and the same molecular weight, the exchange process can be modeled by a first-order chemical reaction with respect to both the bulk molecules and the adsorbed polymers (2).…”

mentioning

confidence: 99%

Kinetics of exchange processes in the adsorption of proteins on solid surfaces.

Ball

Huetz

Elaı̈ssari

et al. 1994

Proc. Natl. Acad. Sci. U.S.A.

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The homogeneous exchange process whereby IgG molecules adsorbed onto latex particles are replaced by IgG molecules from the bulk solution was studied by means of ts radiolabeling. The exchange mechanism was Investigated on surfaces saturated with either labeled or unlabeled proteins in the presence of a solution of the opposite species in two sets of independent experiments. After rinsing of the surface by pure buffer followed by supplementary IgG adsorption, the exchange process.followed a kinetic law of first order with respect to the IgG molecules from the bulk solution, and the apparent exchange rate constant was (2.3 ± 0.4) x 10-5 cm hr'1.One of the main differences between adsorption processes of "small" molecules and of macromolecules on solid surfaces is that macromolecules can reach the surface by two different mechanisms (1): by direct adsorption or by a progressive exchange reaction. In the first case the molecules reach the adsorption surface directly on free available space. In contrast, for the exchange mechanism the molecules reach the surface by progressive removal of already-adsorbed macromolecules. This occurs in particular when the surface is saturated with preadsorbed molecules. This second process has never been observed in the adsorption of small molecules on surfaces.The physical origin of this second adsorption process lies in the fact that macromolecules interact with a surface through several links. These links along the macromolecule change with time, even if the molecule is in an equilibrium configuration. Interactions between macromolecule and surface must thus be considered as a dynamic and not a static process. Moreover, macromolecules are not rigid bodies. Thus, if such a molecule enters into the vicinity of a surface already covered by adsorbed macromolecules, it can change its conformation and diffuse into the adsorbed layer. Once part of the backbone of the diffusing molecule reaches the adsorption surface, it interacts with it. This interaction can then be followed by sequential, segmental, reptation-like adsorption of the molecule, in competition with the dynamic process of the formation and annihilation of links of previously adsorbed macromolecules. Finally, the diffusing molecules progressively replace those already adsorbed on the surface, completing the exchange process.Such processes have been observed for synthetic polymers (2) as well as for proteins (3,4) by means of radioactive labeling techniques. NevertHeless, and in spite of a great number of investigations, little is known about adsorption processes of macromolecules (5). Let us rapidly summarize the main results that have been established. (i) The affinity of proteins for a given surface usually increases with their molecular weight. High molecular weight proteins usually exchange preferentially with lower molecular weight adsorbed proteins (6, 7). (ii) The higher the hydrophobicity of the surface is, the larger is the adsorbed quantity (8, 9). (iii) These amounts are maximal for pH values close to the ...

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“…23 studied the competitive and displacement adsorption of PS and poly(ethylene oxide) (PEO) and reported that PEO adsorbs preferentially over PS, and the preferential adsorption of large molecules over small molecules occurs even in the presence of different species. Thies 12 studied the competitive and displacement adsorption of PS and PMMA mixtures from trichloroethylene solution using IR spectroscopy. He reported the reversibility of adsorption processes in such systems.…”

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confidence: 99%

Time-Dependence of the Displacement Adsorption Behavior of Poly(methyl methacrylate) and Polystyrene System at the Solid-Liquid Interface as Studied by ESR

Kobayashi

Dochi

Yajima

et al. 1993

Polym J

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ABSTRACT:The displacement adsorption behavior of poly(methyl methacrylate) (PMMA) and polystyrene (PS) system onto a nonporous silica surface from solution was studied by utilizing the ESR method. The fractions of train segments for these polymers were determined from the ESR spectra analyses, and these values were compared with those of the individual adsorption. When PS was preadsorbed on silica surface to saturation and then excess PMMA solution of known concentration was added and data taken as a function of adsorption time, the amount of PS desorbed from silica surface was found to increase proportionally with adsorption time until finally PS was completely replaced by PMMA. With the displacement ofPS from the silica surface, the amount of adsorption for PMMA which saturates the silica surface is obviously lower than that when adsorbed on silica surface individually; that is, the adsorbed PMMA has a flatter conformation than that in the individual adsorption. It also takes a long time for PMMA to adsorb on the silica surface compared with the individual adsorption, because a greater number of PS-silica surface attachments must be ruptured in order to effect displacement.KEY WORDS Displacement Adsorption I ESR I Polystyrene I Poly(methyl methacrylate) I Solid-Liquid Interface A number of techniques have been applied to the study of the polymers adsorbed at the solid-liquid interface. 1 -16 Among the molecular models proposed for characterizing polymer molecules adsorbed from solution onto a solid surface, a "loop-train-tail" model is now widely accepted. 1 In order to discuss the conformation of an adsorbed polymer molecule, it is important to estimate the fraction of train segments in all segments of the adsorbed polymer, p.Several studies have been reported on the competitive and displacement adsorption of polymers. 8 • 12 • 17 -28 Kawaguchi et a/. 23 studied the competitive and displacement adsorption of PS and poly(ethylene oxide) (PEO) and reported that PEO adsorbs preferentially over PS, and the preferential adsorption of large molecules over small molecules occurs even in the presence of different species. Thies 12 studied the competitive and displacement adsorption of PS and PMMA mixtures from trichloroethylene solution using IR spectroscopy. He reported the reversibility of adsorption processes in such systems. The present authors 8 reported the competitive adsorption behavior of PS and PMMA mixtures and discussed the conformation of both adsorbed polymers under this condition. We also discussed the difference in the adsorption ability of styrene and methyl methacrylate on the silica surface.

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The Adsorption of Polystyrene-Poly(methyl methacrylate) Mixtures at a Solid-Liquid Interface¹

Cited by 97 publications

References 6 publications

Adsorption of a functionalized polymer from dilute nonaqueous solutions by silica

Adsorption of a functionalized polymer from dilute nonaqueous solutions by silica

Kinetics of exchange processes in the adsorption of proteins on solid surfaces.

Time-Dependence of the Displacement Adsorption Behavior of Poly(methyl methacrylate) and Polystyrene System at the Solid-Liquid Interface as Studied by ESR

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The Adsorption of Polystyrene-Poly(methyl methacrylate) Mixtures at a Solid-Liquid Interface1

Cited by 97 publications

References 6 publications

Adsorption of a functionalized polymer from dilute nonaqueous solutions by silica

Adsorption of a functionalized polymer from dilute nonaqueous solutions by silica

Kinetics of exchange processes in the adsorption of proteins on solid surfaces.

Time-Dependence of the Displacement Adsorption Behavior of Poly(methyl methacrylate) and Polystyrene System at the Solid-Liquid Interface as Studied by ESR

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The Adsorption of Polystyrene-Poly(methyl methacrylate) Mixtures at a Solid-Liquid Interface¹