Polymer diffusion in latex films at ambient temperature

Feng, Jie; Pham, Hung H.; Stoeva, Valentina; Winnik, Mitchell A.

doi:10.1002/(sici)1099-0488(199805)36:7<1129::aid-polb4>3.0.co;2-p

Cited by 27 publications

(30 citation statements)

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“…A particularly interesting system is based on latex film formation. The process of formation of pure latex films has attracted considerable attention over the past two decades [36][37][38][39][40][41][42][43][44] . Latex beads are brought into contact by evaporation of the aqueous solvent above the minimal film formation temperature.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Intermediate Structures and Chain Conformation in Silica–Latex Nanocomposites Observed by SANS During Annealing

et al. 2012

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Abstract:The evolution of the polymer structure during nanocomposite formation and annealing of silica-latex nanocomposites is studied using contrast-variation small angle neutron scattering.The experimental system is made of silica nanoparticles (R si ≈ 8 nm) and a mixture of purpose-synthesized hydrogenated and deuterated nanolatex (R latex ≈ 12.5 nm). The progressive disappearance of the latex beads by chain interdiffusion and release in the nanocomposites is analyzed quantitatively with a model for the scattered intensity of hairy latex beads and an RPA description of the free chains. In silica-free matrices and nanocomposites of low silica content (7%v), the annealing procedure over weeks at up to T g + 85 K results in a molecular dispersion of chains, the radius of gyration of which is reported.At higher silica content (20%v), chain interdiffusion seems to be slowed down on time-scales of weeks, reaching a molecular dispersion only at the strongest annealing. Chain radii of gyration are found to be unaffected by the presence of the silica filler. Tables: 5 2 Figures: 7

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Section: Introductionmentioning

confidence: 99%

Modeling of Intermediate Structures and Chain Conformation in Silica–Latex Nanocomposites Observed by SANS During Annealing

et al. 2012

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“…These formulations consist of particles with different sizes and/or mechanical properties. Several studies of film formation in blended systems have been carried out, [5][6][7] but less is known about the mechanical properties of blended latex films.…”

Section: Introductionmentioning

confidence: 99%

Adhesive and mechanical properties of soft nanocomposites: Model studies with blended latex films

Fabbroni

Shull

Hersam

2001

J Polym Sci B Polym Phys

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ABSTRACT:We used a unique approach based on contact mechanics to quantify the adhesive and linear viscoelastic properties of latex films approximately 100 m thick. The latex films were formed from a mixture of two particle types and form stable films consisting of rigid and compliant regions. We used atomic force microscopy to verify that these regions remained well dispersed on the length scale of the original particle size. The properties of the films were determined by h , the volume fraction of the stiffer component. For h Ͻ 0.45, the films were quite adhesive, with viscoelastic properties determined by the compliant matrix material. Adhesive interactions between the film and indenter enabled us to oscillate the indenter in the direction normal to the film surface while maintaining a constant contact area, allowing us to determine the frequency dependence of the dynamic moduli of the films. Stiffer films with higher volume fractions of hard particles were characterized by indentation measurements, from which we were able to determine the time dependence of the relaxation modulus of the latex films. All results were consistent with a power-law form of the relaxation modulus with an exponent of 0.25. The magnitude of the relaxation modulus increased by a factor of 3000 as the volume fraction of hard particles increased from 0 to 0.89. For low values of h , the composition dependence of the film stiffness was similar to the concentration dependence of the viscosity of spherical particle suspensions. A much weaker concentration dependence was observed for the highest values of h , where the properties of the films were dominated by the stiffer component.

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“…In contrast, a low molecular weight sample (M w = 34,000 (M w /M n = 2.5)) with T g = 21°C, has a measurable diffusion rate at 22°C. 56 ET measurements have also been employed to examine the effect of latex structure (particularly core-shell morphology) on the interdiffusion process. 57,58 SANS and ET measurements are to some extent complementary, in that they sample polymer diffusion on somewhat different length scales.…”

Section: Measuring Polymer Diffusion In Latex Filmsmentioning

confidence: 99%

Functional latex and thermoset latex films

Taylor¹,

Winnik

2004

J Coat. Technol. Res.

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111

124

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We review advances in the design and development of functional latex particles that can be used to form crosslinked coatings. Our emphasis is on understanding fundamental principles, of the formation and aging of latex films, of crosslinking of polymer films, of the reaction mechanisms that lead to bond formation, and of the competition between bond formation and polymer diffusion in latex films. These principles form the basis for the design of modern coatings that combine high performance with environmental compliance.

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Polymer diffusion in latex films at ambient temperature

Cited by 27 publications

References 2 publications

Modeling of Intermediate Structures and Chain Conformation in Silica–Latex Nanocomposites Observed by SANS During Annealing

Modeling of Intermediate Structures and Chain Conformation in Silica–Latex Nanocomposites Observed by SANS During Annealing

Adhesive and mechanical properties of soft nanocomposites: Model studies with blended latex films

Functional latex and thermoset latex films

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