Polymers at Surfaces and Interfaces

Jones, Richard; Richards, Roy J.

doi:10.1017/cbo9780511623196

Cited by 469 publications

(388 citation statements)

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“…The linear agreement is excellent, producing a slope of 1.015. SCFT therefore shows the same two-regime behav ior as has been discussed and debated in the literature [3][4][5][6][7][8][9][10]. SCFT predicts this two-regime behavior spontaneously from a single theory.…”

supporting

confidence: 69%

“…SCFT is an appropriate method to use to study polymer surface tension because although SCFT is a coarse-grained theory, it is microscopic in the sense that it includes all polymer configurational degrees of freedom, un like phenomenological density gradient theory, for example, [7][8][9]. Jones and Richards [10] point out that presently poly mer surface tension MW dependence is "explained" in terms of a mix of phenomenological density gradient theory for higher MW and an empirical formula for lower MW. This is a wholly unsatisfactory situation.…”

mentioning

confidence: 99%

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Origin of change in molecular-weight dependence for polymer surface tension

2008

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Self-consistent-field theory is used to reproduce the behavior of polymer surface tension with molecularweight for both lower and higher molecular-weight polymers. The change in behavior of the surface tension between these two regimes is shown to be due to the almost total exclusion of polymer from the nonpolymer bulk phase. The predicted two regime surface tension behavior with molecular-weight and the exclusion explanation are shown to be valid for a range of different polymer compressibilities. In this paper, we show that many approximations made in previous works [3][4][5][6] are unnecessary as the polymer surface tension can be calculated using full numerical selfconsistent-field theory (SCFT) with no approximations be yond the mean field. SCFT is an appropriate method to use to study polymer surface tension because although SCFT is a coarse-grained theory, it is microscopic in the sense that it includes all polymer configurational degrees of freedom, un like phenomenological density gradient theory, for example, [7][8][9]. Jones and Richards [10] point out that presently poly mer surface tension MW dependence is "explained" in terms of a mix of phenomenological density gradient theory for higher MW and an empirical formula for lower MW. This is a wholly unsatisfactory situation. We will show that SCFT spontaneously reproduces the expected experimental two re gime behavior of polymer surface tension, and allows us to explain why there is a change of behavior between low and high MW polymer surface tensions. Since an understanding of MW dependence of surface tension is an important ingre dient for the advancement of many industrial processes, these SCFT results represent an important step beyond pre vious theories.The SCFT formalism for polymer surface tension has been described by us in a previous presentation [11] where it was successfully used to predict qualitative surface tension trends as a function of temperature and pressure for a single polymer MW. There we used a parameter a = 0.1; a is the ratio of the volume of a solvent molecule to the volume of a polymer molecule. It is inversely proportional to the polymer MW. In the present work, we lower the value of a (increase the polymer MW) to investigate the behavior of surface ten sion as a function of MW. The free energy for a compressible polymer-solvent system iswhere ' s (r), ' p (r), and ' h (r) are the local volume fractions of solvent, polymer, and "holes," respectively, and w s (r), w p (r), and w h (r) are conjugate chemical potential fields. The function i(r) is a pressure field that enforces a constant total density, including the holes. Compressible systems with in homogeneous total densities are thus modeled in this incom pressible formalism through the presence or absence of va cancies (holes). This is a method introduced by Hong and Noolandi that reduces to the Sanchez-Lacombe equation of state in the limit of a homogeneous system [12]. Other equa tions of state can also be chosen within the SCFT formalism [13]. Q s and Q p are the part...

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supporting

confidence: 69%

mentioning

confidence: 99%

Origin of change in molecular-weight dependence for polymer surface tension

2008

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“…One such application has been onedimensional depth profiling of polymer films and multilayers, which has provided a significant driving force for growth in experimental and theoretical polymer physics over the past 20 years [6]. Deuterium substitution is by far the most common type of tracer labeling used for analysis of polymer films and multilayers [7], with the commercial availability of various labeled reagents and monomers.…”

mentioning

confidence: 99%

Carbon-13 labeling for improved tracer depth profiling of organic materials using secondary ion mass spectrometry

Harton

Stevie

Ade

2006

J. Am. Soc. Mass Spectrom.

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“…33,34 It is known that surfactants and other hydrophilic species are located at the surface of latex particles to ensure colloidal stability, and so the surfaces responsible for the phase restructuring are not only composed of the copolymers.…”

Section: Ir Heating Of Nanocomposite Adhesives To Switch Off Adhesionmentioning

confidence: 99%

Large-Area Patterning of the Tackiness of a Nanocomposite Adhesive by Sintering of Nanoparticles under IR Radiation

Gurney

Dupin

Siband³

et al. 2013

ACS Appl. Mater. Interfaces

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We present a simple technique to switch off the tack adhesion in selected areas of a colloidal nanocomposite adhesive. It is made from a blend of soft colloidal polymer particles and hard copolymer nanoparticles. In regions that are exposed to IR radiation through a mask, the nanoparticles sinter together to form a percolating skeleton, which hardens and stiffens the adhesive. The tack adhesion is lost locally. Masks can be made from silicone-coated disks, such as coins. Adhesive island regions are defined with the surrounding regions being a non-tacky coating. When optimizing the nanocomposite's adhesive properties, the addition of the hard nanoparticles raises the elastic modulus of the adhesive significantly, but adhesion is not lost because the yield point remains relatively low. During probe-tack testing, the soft polymer

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Polymers at Surfaces and Interfaces

Cited by 469 publications

References 0 publications

Origin of change in molecular-weight dependence for polymer surface tension

Origin of change in molecular-weight dependence for polymer surface tension

Carbon-13 labeling for improved tracer depth profiling of organic materials using secondary ion mass spectrometry

Large-Area Patterning of the Tackiness of a Nanocomposite Adhesive by Sintering of Nanoparticles under IR Radiation

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